Why Does my Humidifier Have White Dust Around It?

White dust around a humidifier comes from minerals in the water. When tap water is turned into mist, the water evaporates but the minerals don’t, so they settle on surfaces and build up inside the machine. It’s usually not dangerous, but it can be annoying and lead to more frequent cleaning.

Why does my humidifier have white dust around it?

White dust around a humidifier is caused by minerals in the water, most commonly calcium and magnesium.

When an ultrasonic humidifier turns water into mist, the water evaporates into the air — but the minerals do not. Those minerals settle on nearby surfaces and gradually build up inside the humidifier itself.

This is why white dust is more noticeable in homes with hard tap water and why the residue often looks similar to buildup on faucets or shower heads.

Is White Dust From a Humidifier Dangerous?

For most people, white dust from a humidifier is not considered dangerous.

However, because the dust is made of fine mineral particles, it can be irritating for some individuals to breathe in — especially those with asthma, allergies, or other respiratory sensitivities.

The main issue with white dust is not toxicity, but buildup: it collects on surfaces, inside the humidifier, and can shorten the life of the device if it isn’t cleaned regularly.

In many cases, white dust starts appearing after a change in water type. If you recently switched from distilled water to tap, bottled, or filtered water — even temporarily — the added mineral content can show up as residue within days.

If you’re unsure whether water choice is contributing to the problem, we break down when distilled water really matters (and when tap water is usually fine) in our guide to using distilled water in a humidifier.

How to clean the white dust off of your humidifier?

White mineral residue can usually be removed with a mild acid such as vinegar. Wiping affected areas clean during routine maintenance helps prevent buildup from accumulating inside the humidifier.

Regular cleaning not only keeps surfaces cleaner, but also helps the humidifier operate more efficiently over time.

What can be done about the white dust that gets on your humidifier?

1. Clean the humidifier more often

This step we have already gone through, but it cannot be stressed enough that a humidifier must be kept clean.
Humidifiers can begin to grow bacteria inside of the water in as little as 48 hours. Operating a humidifier that has had standing water sitting in it can turn the device into a health hazard. And water that has a lot of minerals in it can provide food sources for mold and bacteria to take root inside of the humidifier.

2. Switch the type of water

The white dust deposits around your humidifier are there because of the high mineral content in your water. Tap water and drinking water are full of minerals. Spring water even more so. Even water that is processed by osmosis has minerals added back into it for consumption.

So what kind of water should you use in a humidifier?

A. Distilled water

The only water that is near perfect to use in a humidifier is distilled water. It is because distilled water goes through a process that removes the minerals and particles from it. Distilled water can even lengthen the life of your humidifier because it eliminates the likelihood of mineral buildup inside of your machine. Build up that will eventually diminish the effectiveness of it.

B. Boiled water

Boiling water will also separate the minerals of the water. If you have ever seen a pan that is used for boiling water over and over, then you probably noticed the white rings that develop on the pan. If the pan is used specifically for boiling water, it will develop a layer of white calcium deposit that will eventually flake off.

But the main issue with using boiled water for the humidifier is filtering the clean part of the water into the humidifier without the big build ups of sediment getting into the humidifier with it.

Also it’s a huge ordeal to have to boil water every time you need to fill your humidifier. ( Notice we said boiled water and not boiling water, don’t pour boiling water into the humidifier. You will probably damage the humidifier beyond use and you will also risk getting burned badly in the process.)

C. Filtered water

Water filters do not take out 100% of minerals and particles from tap water. But they do remove a huge portion of them. Using filtered water is better than using tap water but it is still not as good as using distilled water.

D. Vaporizer/ warm mist humidifier

Warm mist humidifiers or vaporizers have a built-in advantage when it comes to keeping the water inside of the humidifier clean.

The advantage is the heat that they produce. Since these machines heat the water to a boiling point to produce steam, they also inadvertently kill bacteria and germs before they become an issue with your humidifier or your health.

Boiling water also separates minerals in water which are removed through the humidifiers filter. Warm mist humidifiers have a lot of benefits and advantages over using cool mist humidifiers.

But they do have the downside of making a room feel steamy. Which can be great for a little while, but not so much when you’re trying to sleep.

Especially if you’re sick. They also have the danger element of containing scalding water. This is why every warning label you’ve ever seen about vaporizers says that they should not be used around or put in children’s rooms.

Can I Leave My Humidifier Running Overnight?

Is Leaving a Humidifier Running All Night Safe?

Yes, you can safely run a humidifier overnight as long as you take a few precautions. The key is choosing the right type of humidifier and following proper maintenance practices to prevent excess moisture and mold growth in your bedroom.

Humidifiers add essential moisture back into dry indoor air. Letting a humidifier run overnight can help relieve respiratory issues like sinus congestion, dry skin, and irritated nasal passages caused by arid winter air or summer air conditioner use. Maintaining the ideal 30-50% humidity range overnight provides the best sleeping environment.

Looking for more humidifier tips? Click here for the guide.

Why Use a Humidifier While Sleeping?

Here are some of the top reasons people run a bedroom humidifier at night:

Alleviates symptoms of colds, allergies, asthma, and sinusitis
Prevents dry skin, cracked lips, and bloody noses
Reduces snoring from congestion
Lessens incidence of scratchy throats and coughs
Helps Houseplants thrive
Protects wood furniture and flooring from drying out

The heat from furnaces and wood stoves removes moisture from indoor air. This dry air can irritate and inflame your nasal passages, throat, lungs, and skin while you sleep. Running a humidifier restores that lost moisture to a comfortable level so you can breathe and sleep easier.

Potential Risks of All-Night Humidifier Use

While humidifiers offer many benefits, some potential risks come with leaving them running overnight unattended:

Accumulation of mineral deposits from tap water
Wet spots, moisture damage, and mold growth on walls or furniture
Bacteria and mold growth inside the tank and filter
Condensation dripping from windows and cold surfaces
Excess humidity that creates an environment conducive to dust mites, viruses and allergens

We’ll discuss how to avoid all these potential issues later on. But first, let’s look at which types of humidifiers are safest for overnight use.

Best Humidifiers for All-Night Use

Some humidifiers are better suited and safer for running at night while you sleep. The ideal overnight humidifier will:

Run quietly to avoid disrupted sleep
Produce cool mist instead of hot steam
Have an automatic shut-off to prevent overflowing
Be easy to clean and refill
Have adjustable humidity settings

Many modern ultrasonic humidifiers from well-known brands like Honeywell, Levoit, and Crane are designed specifically for quiet overnight bedroom use.

Based on these criteria, these are the top types of humidifiers recommended for leaving on all night:

Ultrasonic Cool Mist Humidifiers

Ultrasonic cool mist humidifiers use high-frequency vibrations to create a fine invisible mist. The mist evaporates into the air quickly to raise humidity levels. They are called “cool mist” because they do not heat the water, only vibrate it.

Benefits:

Silent operation perfect for light sleepers
Automatic shut off when empty
Fewer minerals deposits than warm mist options
Safer than steam vaporizers for kids’ rooms

Just be sure to only use distilled water, not tap water which contains more minerals. And clean them thoroughly to prevent any mold growth.

Warm Mist Humidifiers

Warm mist humidifiers heat the water to create hot steam. The heat helps kill mold and bacteria that could grow in the tank. They work well to alleviate sinus congestion.

Benefits:

Kills mold and bacteria with hot steam
Provides temporary relief of congestion
Uses regular tap water

Just take caution with kids in the room as the steam vapor can cause burns if touched. Place it out of reach.

Evaporative Humidifiers

Evaporative humidifiers draw dry air through a wet wick filter to add moisture. The fans then circulate the humidified air in the room. They are very affordable but require more cleaning to prevent mold in the filter.

Benefits:

Inexpensive to operate
Uses regular tap water
Humidifies rooms efficiently

Downsides are the noise from the fan motor and frequent filter changes. But overall they are an effective option for overnight use.

Room Steam Vaporizers

Basic steam vaporizers that boil water to create steam should be avoided in bedrooms overnight. They pose a serious scald risk to children if accidentally tipped over. And the hot steam can damage furnishings over time. Use them with caution and only when awake to monitor.

Safety Tips for All-Night Operation

Follow these tips when running a humidifier in your bedroom overnight:

Pick the Right Spot

Place the humidifier at least 2-3 feet from the bed and aim the mist away from bedding.
Set it on an waterproof surface like a tray or plastic table protector.
Keep humidifier off wood surfaces which may warp from moisture.
Avoid plugging into an outlet right behind the bed.

Monitor the Moisture Levels

Use a hygrometer to keep the humidity between 30-50%. Higher than 50% risks mold growth.
Turn off the unit if moisture condenses on windows or walls.
Run a dehumidifier during the day to balance out excess nighttime moisture.

Keep the Tank Clean

Change water and clean the tank daily to inhibit mold growth.
Disinfect with bleach solution weekly.
Use distilled water to prevent mineral deposits.
Replace filters as needed.

Air Out the Room

Crack windows and open doors during the day to circulate fresh air.
Dust and vacuum regularly to remove allergens.
Wash bedding weekly to prevent dust mites.

Monitor Usage

Turn off the humidifier if anyone wakes up coughing or wheezing.
Listen for any strange noises which could indicate a malfunction.
Check that auto shut-off works when tank is empty.

Ideal Humidity Levels for Sleeping

Aim to keep bedroom humidity between 30-50% for optimal sleep comfort and health:

Humidity Range	Effects
30-50%	Ideal for sleeping. Helps open airways.
50-70%	Increased risk of condensation, mold growth and dust mites.
Below 30%	Dry airways, irritated respiratory passages and skin.

Use a hygrometer placed at sleeper level to monitor the humidity. Adjust mist output on the humidifier as needed to stay in the 30-50% comfort zone overnight.

Troubleshooting Humidifiers Running Overnight

If any issues come up with your overnight humidifier, try these troubleshooting tips:

Condensation Forms on Windows

Humidity is too high – Turn off the humidifier and open windows.
Check for leaks allowing excess moisture to escape.
Clean moisture off windows each morning before it causes damage.

Mold Growth in Tank or on Filters

Clean tank and replace filters regularly.
Use bleach solution weekly to disinfect.
Leave tank open to fully dry between uses.
Switch to distilled water instead of tap water.

Mineral Dust on Surfaces

Stop using tap water and only use distilled.
Change filters more frequently.
Clean mineral deposits with vinegar-water mix.

Respiratory Irritation When Used

May indicate mold growth – clean unit thoroughly.
Check for dust mites on bedding and vacuum.
Stop use and see if symptoms improve.
Consult a doctor if irritation persists.

Main Points on Overnight Humidifier Safety

Here are the key takeaways on running humidifiers safely all night long:

Choose ultrasonic cool mist or evaporative humidifiers which are designed for bedrooms.
Maintain 30-50% humidity to balance comfort and health.
Clean and disinfect the tank daily to prevent mold growth.
Use distilled or filtered water instead of tap water.
Set on a waterproof surface away from bedding and walls.
Monitor humidity levels and watch for any condensation.
Air out bedroom during the day to keep fresh air circulating.

Taking these precautions allows you to gain all the benefits of overnight humidification without worrying about potential downsides. Just be diligent in your maintenance routine. Check that the auto shut-off works properly. And make sure no one is showing any signs of allergy or irritation issues from its use. Enjoy restful sleep with just the right amount of moisture in the air.

Hydrogen Peroxide in Humidifier – What’s the Controversy?

Have You Heard of Putting Hydrogen Peroxide in a Humidifier?

The idea might sound harmless — maybe even comforting. Hydrogen peroxide has been in our medicine cabinets for as long as most of us can remember. I can still picture my mom reaching for the brown bottle anytime I scraped my knee, the fizzing bubbles dancing on the wound like a little science experiment. It felt like part of growing up — as normal as band-aids and hugs.

That’s probably why it caught me off guard when I first heard there was controversy around it. It never occurred to me that something so ordinary, so tied to childhood memories and first-aid kits, could become the center of a heated debate.

And yet here we are. People are talking about putting hydrogen peroxide in humidifiers — not just to clean them, but to purify the air, or even to inhale the mist for health benefits. That’s where things get complicated.

So let’s take a closer look at the controversy. What are the claims, what do the experts say, and what’s the real risk in adding this familiar liquid to your humidifier?

see our complete humidifier guide

Hydrogen Peroxide in Humidifiers: Why It’s So Controversial

Hydrogen peroxide has been a household staple for generations — from treating scrapes to cleaning surfaces. But lately, it’s found its way into a controversial discussion: should it be added to your humidifier?

This debate isn’t just about cleaning. It touches on health, air quality, and even the fine line between science and alternative medicine. Let’s unpack the arguments — and the risks — behind putting hydrogen peroxide in a humidifier.

Why Some People Use Hydrogen Peroxide in a Humidifier

1. Inhaling Hydrogen Peroxide for Respiratory Relief

Some people believe that inhaling the mist from hydrogen peroxide can relieve respiratory symptoms like congestion, cough, or even viral infections. It’s easy to see the appeal: hydrogen peroxide is known for killing germs on surfaces, so why not in the lungs?

The reality: Health professionals strongly caution against inhaling hydrogen peroxide. Even at low concentrations, the mist can irritate or harm sensitive lung tissue. There’s no reliable evidence proving it helps, and the risk of lung damage is real.

2. Disinfecting the Air

Another claim is that hydrogen peroxide mist cleans the air by neutralizing viruses and bacteria. After all, some hospitals use hydrogen peroxide vapor systems to disinfect rooms — so why not replicate that at home?

The problem: Hospital-grade disinfection systems use highly controlled vapor concentrations and specialized equipment — not a home humidifier. Regular humidifiers can’t achieve the proper output, contact time, or safety controls for air disinfection using hydrogen peroxide.

Yes, hydrogen peroxide vapor *can* disinfect surfaces — this study shows it worked against viruses. But that doesn’t mean the same results are possible in your living room with a tabletop humidifier.

3. Keeping the Humidifier Clean

Some people add a splash of hydrogen peroxide to prevent mold or bacterial buildup inside the tank. This might seem like a smart shortcut, but it’s not without consequences.

Hydrogen peroxide can corrode the humidifier’s internal parts over time, especially if it’s a plastic unit. That damage can shorten the device’s lifespan — and potentially release harmful particles into the air.

Can You Use Hydrogen Peroxide to Clean a Humidifier?

You can — but with caution. If you’re disassembling the humidifier and rinsing thoroughly afterward, hydrogen peroxide can help remove microbial buildup. However, white vinegar or diluted bleach are usually safer and more effective choices for cleaning without damage.

The Other Side of the Story: Alternative Health Perspectives

Despite expert warnings, many alternative health advocates believe diluted hydrogen peroxide vapor has healing properties. They say it can clear nasal passages, kill airborne pathogens, and even help reduce viral loads during illness.

Supporters often reference anecdotal success — people who say this is the only thing that helped them recover from illness. There’s also research suggesting low-concentration hydrogen peroxide is safe on mucous membranes, like in this PubMed article used in ENT (ear, nose, and throat) medicine.

Still, this doesn’t mean it’s safe to use in a humidifier. These procedures are usually done under medical supervision and in precise concentrations — not poured into a consumer appliance and inhaled for hours.

What About Gargling with Hydrogen Peroxide?

This is another popular alternative practice. Many use a diluted 1.5% solution to gargle or rinse nasal passages during cold and flu season. And while it’s unrelated to humidifiers, it’s part of the same overall movement toward hydrogen peroxide as a DIY remedy.

Just be aware: Even gargling hydrogen peroxide has risks if not done properly. Don’t exceed recommended concentrations, and always avoid swallowing it.

So… Should You Put Hydrogen Peroxide in Your Humidifier?

Experts say no. Whether your goal is to disinfect air, relieve respiratory symptoms, or clean your humidifier, the risks of using hydrogen peroxide in this way usually outweigh the rewards.

Hydrogen peroxide can damage your lungs when inhaled, corrode your humidifier, and possibly create unexpected chemical reactions when mixed with minerals or additives in tap water.

But not everyone agrees. Proponents of natural and alternative medicine argue that low-dilution use is safe and beneficial. They point to personal stories and niche studies to support their case.

BreatheBetterAir.org is an informational website — we’re not doctors, and we don’t encourage or discourage medical practices. But we do encourage safety first. If you’re considering trying this, talk to a medical professional and make sure you understand all the risks.

Safety Warning

Never use undiluted hydrogen peroxide in a humidifier.
3% hydrogen peroxide should be diluted by at least 50% before use (though it’s still not recommended).
Food-grade hydrogen peroxide (35%) is highly corrosive and must be diluted 10:1 or more — and handled with gloves and protective clothing.

Bottom line: The controversy exists because there are passionate opinions on both sides. But until more safety data is available, it’s best to approach this method with extreme caution — or skip it altogether.

Final Thoughts: Just Because It Feels Familiar, Doesn’t Mean It’s Safe

It’s easy to trust something we’ve known all our lives. That little brown bottle of hydrogen peroxide feels almost nostalgic — like part of a simpler time when first-aid meant a sting, a hug, and maybe a lollipop. But the comfort of familiarity can be misleading, especially when we start using something in ways it was never really meant for.

Putting hydrogen peroxide in a humidifier may sound like a harmless DIY trick — but it carries real risks. Inhaling it can harm your lungs, it can damage your device, and the supposed benefits often come from anecdotal stories rather than solid science.

That’s not to say the people who swear by it are wrong — but it does mean that if you’re thinking about trying it, you should do your homework, talk to a medical professional, and weigh the risks carefully.

There are safer, proven ways to clean your air, your humidifier, and your lungs. And while hydrogen peroxide still deserves a spot in your medicine cabinet, maybe it’s best to keep it there — and not in your vapor stream.

Sometimes, the old remedies really are the best. Other times, they’re best left in the past.

My Wife’s CPAP Broke from Tap Water: Why Distilled Is the Only Safe Choice

No — you should not use tap water in your CPAP machine. Tap water contains minerals, bacteria, and other impurities that can damage the device, leave behind harmful buildup, and even cause respiratory problems. Always use distilled water to keep your CPAP safe and effective.

Why You Shouldn’t Use Tap Water in a CPAP

When you set up a CPAP machine at night, it feels natural to just fill the reservoir with whatever water is on hand. But here’s the problem: tap water isn’t pure. It contains minerals like calcium and magnesium, trace metals, and sometimes even chlorine or bacteria. Over time, those tiny impurities can turn into big problems for both your machine and your health.

Organizations like the Sleep Foundation and the American Academy of Sleep Medicine both stress that distilled water is the only safe, long-term choice for CPAP humidifiers.

A Real-World Example: What Happened When My Wife Used Tap Water

My wife got her CPAP through a sleep study, so it wasn’t as simple as running to the store for a replacement when it stopped working. When the machine quit, she had to send it off for repair. They gave her a loaner in the meantime, but even that took a mix-up and extra waiting to sort out. In the end, she went weeks without her own machine, struggling through the hassle of back-and-forth replacements.

Finally, the repair center let us know what had happened: the problem wasn’t a bad motor or faulty electronics — it was the water. The tap water she had been using had left behind so much mineral buildup that it clogged and damaged the system. All of that frustration, time lost, and inconvenience came down to one simple mistake: not using distilled water.

What Happens If You Use Tap Water?

Mineral Buildup: Hard water leaves white, chalky deposits inside the water chamber. Over time, these scale deposits can damage heating elements and block airflow.
Bacterial Growth: Tap water is not sterile. Bacteria and mold can grow in the humidifier chamber, then travel into the mask and tubing — straight into your lungs.
Bad Smells: Machines can start to smell musty or stale, making it harder to sleep comfortably.
Warranty Issues: Manufacturers often state clearly that using anything other than distilled water may void your warranty. The FDA lists distilled water as the standard for safe use in medical devices like CPAPs, BiPAPs, and APAPs.

Repair shops see this all the time — it’s one of the top reasons CPAP machines fail early.

Water Types Compared for CPAP Use

Not all water is created equal. Here’s how different types stack up for CPAP safety:

Water Type	Safe for CPAP?	Notes
Distilled Water	✅ Best choice	Removes minerals & bacteria; manufacturer-recommended.
Tap Water	❌ No	Mineral deposits, bacteria, mold, and warranty issues.
Bottled/Spring Water	⚠️ Short-term only	Often contains minerals; may cause buildup.
Boiled Tap Water	⚠️ Short-term only	Kills bacteria but minerals remain; still causes scaling.
Filtered Water	⚠️ Not recommended	Reduces some impurities but doesn’t remove minerals completely.

The Cost of Repairs vs. Distilled Water

A gallon of distilled water usually costs between $1 and $2 at most grocery stores. A CPAP repair, on the other hand, can run anywhere from $100 to $300 or more depending on the issue. And if your machine was supplied through a sleep study, the process of getting it fixed can drag out for weeks — leaving you dependent on a loaner machine or, worse, without one at all. That makes distilled water one of the cheapest and smartest forms of protection you can buy.

Why Protecting Your CPAP Matters

CPAP, BiPAP, and APAP machines aren’t just gadgets — they’re life-changing medical devices that keep sleep apnea under control. Going without one for even a few nights can mean poor sleep, daytime fatigue, higher blood pressure, and added strain on the heart. Protecting your machine with distilled water isn’t just about saving money on repairs — it’s about protecting your health every single night.

Quick Checklist: Caring for Your CPAP Humidifier

✔️ Always use distilled water
✔️ Empty the chamber daily
✔️ Wash with mild soap weekly
✔️ Replace the water chamber as recommended
✔️ Inspect tubing and mask regularly for buildup

Following this routine will prevent most problems CPAP users run into — from funky smells to clogged machines.

Health Risks of Using the Wrong Water

It’s not just about protecting the device. Using tap water or letting bacteria grow in your CPAP humidifier can lead to respiratory irritation, sinus infections, and even more serious conditions like pneumonia. The American Lung Association warns that contaminated air sources can worsen chronic respiratory conditions, especially in people already dealing with sleep apnea. For anyone with a compromised immune system, the risks are even higher.

What If You Don’t Have Distilled Water?

Sometimes you might run out of distilled water at night. If you’re in a pinch:

Boiled Water: Boil tap water for at least 5 minutes, then let it cool. This removes bacteria but not minerals — so use sparingly.
Bottled Water: Safer than tap, but still not ideal because it often contains minerals.
Filtered Water: Removes some impurities but still doesn’t equal distilled.

These are temporary solutions only. As soon as possible, switch back to distilled water to avoid long-term problems.

Travel Tips for CPAP Users

If you travel often, it can be tricky to always find distilled water on the road. Here are some ways to stay prepared:

✈️ Pack small bottles of distilled water in your luggage for short trips.
🛒 Order travel-size CPAP water packs online for convenience.
🏠 Invest in a home countertop water distiller if distilled water is hard to find in your area.
📦 Use an Amazon Subscribe & Save option to always have a steady supply delivered to your door.

With a little preparation, you can avoid the temptation to use tap water while away from home.

Lesson Learned: Distilled Water Is Cheap Protection

If you take nothing else away from this article, remember this: distilled water is not just a suggestion — it’s the lifeline of your CPAP machine. My wife’s experience showed how quickly things can snowball: weeks without her own machine, hassle with a loaner, and the frustration of learning that it all came down to tap water. Don’t risk damaging your machine, voiding your warranty, or breathing in harmful bacteria. A $1 jug of distilled water keeps your therapy safe, your machine running longer, and your nights worry-free.

CPAP Water FAQs

Here are some of the most common questions people have about CPAP water use:

What happens if I accidentally used tap water one night?

Don’t panic — one night won’t usually cause major damage. Just empty the chamber in the morning, rinse it well, and switch back to distilled water. Problems come from repeated use of tap water, which leads to buildup and bacterial growth.

Can I use bottled water in my CPAP?

Bottled water is cleaner than tap but often contains minerals, so it’s not a safe long-term replacement. If you’re traveling and can’t find distilled water, bottled can work for a night or two until you get the right water.

Can I boil tap water to make it safe for my CPAP?

Boiling kills bacteria, but it does not remove minerals. So while boiled water is safer than raw tap water in an emergency, it still risks leaving deposits inside your CPAP over time. Use only as a short-term solution.

How often should I clean my CPAP water chamber?

Most manufacturers recommend rinsing it daily and giving it a thorough wash with mild soap once a week. Regular cleaning prevents buildup and bacteria, even when you’re using distilled water.

What happens if I keep using tap water anyway?

Over time, you’ll likely face mineral scale buildup, musty smells, and possibly mold. Worst case, the machine can fail — just like my wife’s did — leaving you without therapy until it’s repaired or replaced.

Whole-House Steam Humidifiers: Benefits and Considerations

What is a Whole House Steam Humidifier?

A steam humidifier is a specialized type of whole-house humidifier that integrates directly into a home’s HVAC ductwork.

True to its name, it employs a steam-generation technique by boiling water to produce steam. This steam is then efficiently distributed throughout the entire house via the duct system, effectively increasing the humidity levels across all rooms.
This method not only ensures a uniform distribution of moisture but also provides precise control over the indoor humidity levels, making it an ideal solution for maintaining optimal indoor air quality and comfort throughout your home.

Benefits of using a steam humidifier:

Steam humidifiers offer a wide array of advantages over other types of humidifiers like evaporative and ultrasonic models, especially in the context of whole-house humidification.

However, a key benefit that truly sets steam humidifiers apart and boosts their popularity is their water boiling process. By heating water to create steam, these humidifiers naturally purify the water, significantly reducing the presence of mineral dust and eliminating germs.

This feature not only ensures a more consistent and efficient distribution of humidity throughout large areas but also provides a cleaner, healthier air quality, making steam humidifiers a preferred choice for maintaining optimal indoor comfort and health.

Don’t miss our in-depth Humidifier Guide.

Types of steam humidifiers:

Type	Description
Console humidifiers	Free-standing units with an internal reservoir, heating element, and fan to distribute steam.
Electrode humidifiers	Use electrodes in the water that boil the water to produce steam.
Canister humidifiers	Portable units with a removable water tank.

Comparison of Steam Humidifiers with Other Types
Feature	Steam Humidifier	Evaporative Humidifier	Ultrasonic Humidifier
Humidity Control	High precision	Moderate	Varies
Coverage	Whole house	Single room to whole house	Single room
Water Purification	Boiling process	Wick filter	None
Maintenance Frequency	Lower	Higher	Moderate
Operation Noise	Quiet	Can be noisy	Very quiet
Mineral Dust Production	None	Possible	Possible
Ideal Use	Large, integrated systems	Individual rooms or smaller homes	Individual rooms

Steam humidifiers excel in large-scale applications, offering precise control and efficient performance without the drawbacks of mineral dust or frequent maintenance. Their quiet operation and ability to integrate into existing HVAC systems make them an ideal choice for comprehensive home humidification solutions.

Who can benefit from a steam humidifier?

A steam humidifier, particularly the whole-house variety that integrates with a home’s HVAC system, is best suited for specific circumstances where its unique advantages can be fully leveraged:

Large Homes or Spaces: Given its capacity to distribute moisture evenly throughout extensive areas, a steam humidifier is ideal for larger homes where maintaining consistent humidity levels in every room is challenging.
High Demand for Precise Humidity Control: In environments where maintaining an exact humidity level is crucial, such as homes with sensitive woodwork, artwork, or musical instruments, the precise control offered by steam humidifiers is invaluable.
Cold Climates with Heavy Heating Use: In areas where the heating system is frequently used, indoor air can become extremely dry. Steam humidifiers can effectively counteract this by integrating with the heating system to provide necessary moisture.
Health-Related Needs: For households with occupants who have severe respiratory issues, allergies, or skin conditions aggravated by dry air, the clean and consistent moisture output of a steam humidifier can provide significant relief.
Integration with Smart Home Systems: For homeowners who prioritize smart home technology and seek seamless integration with existing HVAC systems for centralized control, steam humidifiers are an excellent fit due to their compatibility and efficiency.
Areas with Hard Water: The boiling process of steam humidifiers can help minimize issues related to mineral buildup, making them a suitable option in regions with hard water, where other types of humidifiers might struggle or require frequent maintenance.

In these scenarios, the unique features of a steam humidifier—such as its ability to provide rapid, consistent, and controlled humidification over large areas—make it an optimal choice for effective whole-house humidity management.

Is it true that steam humidifiers are the best for avoiding the dangers of humidifiers mold and bacteria?

Like we briefly touched on before, there are some advantages to steam humidifiers when it comes to avoiding mold and bacteria, but they are not completely immune to these issues:

Steam humidifiers boil water, which can help kill mold spores and bacteria that might be in the water. However, this is only effective if the water reservoirs are cleaned regularly.

Steam humidifiers don’t require wicks or filters that can trap mineral deposits and microbes. However, the steam outlet and any surfaces the steam touches can still allow mold growth if not cleaned.

Steam humidifiers add dry steam to the air rather than cool mist, which is less likely to promote surface condensation that can lead to mold.

However, steam humidifiers still require proper maintenance to prevent mold and bacteria:

1.The water reservoir should be cleaned regularly with a disinfectant to kill any mold or bacteria.
2.Any surfaces the steam comes into contact with should be cleaned to prevent microbial growth.
Steam humidifiers, like other types, can spread microbes in the air if the water reservoir contains any contaminants. Always use clean water.

Are Steam Whole House Humidifiers better at avoiding mold and bacteria than the other types of whole house humidifiers?

Yes, in general steam humidifiers are better at avoiding mold and bacteria growth compared to other types of whole house humidifiers:

1.Evaporative humidifiers require wicks and filters that can promote mold growth if not cleaned regularly. The standing water is also prone to bacterial growth.

2.Ultrasonic and impeller humidifiers produce cool mists that can condense on surfaces and promote mold.

By contrast, steam humidifiers boil the water, killing many microbes. And they don’t require wicks or filters.

However, steam humidifiers are not foolproof:

If not cleaned regularly, mineral deposits can accumulate in the water reservoir and provide an environment for microbial growth.

Steam can condense on humidifier surfaces, allowing mold if not cleaned.
Adding steam to air can make dust particles and allergens airborne.
So while steam humidifiers have an advantage, proper maintenance is still crucial

Do You Need A Boiler Present?

Steam humidifiers do have higher energy demands compared to other types of humidifiers, which can make them more expensive to operate, especially if a boiler is not already present.

Here are some factors to consider regarding the costs of steam humidifiers:

Steam humidifiers require heating water to boiling temperatures, which uses more electricity than cool mist options. This can drive up energy bills.

Installing a steam humidifier without an existing boiler/furnace can require running new steam lines, condensed water returns, and installing a water heater to generate steam. This significantly increases upfront costs.

Without a boiler, standalone electric steam humidifier units are available, but energy costs may still be high depending on humidification needs.

Ongoing costs are higher as mineral deposits in hard water can cause scaling in steam humidifiers, requiring frequent maintenance and part replacement.

However, in a large home a steam humidifier may be the only option capable of properly humidifying the whole space. Their higher output can justify the costs.

In summary, for homes without an existing steam system/boiler, the costs of installing and operating a steam humidifier are often prohibitive.

Cool mist and evaporative options are more affordable.

But steam systems make sense for larger homes if the initial investment can be accommodated. As with any system, considering long term costs and benefits is advisable.

FAQ

How do steam humidifiers increase humidity?

Steam humidifiers boil water in a reservoir to produce water vapor or steam. This steam is dispersed into the air through a built-in fan or existing HVAC system ducts. As the steam evaporates in the air, it raises the humidity level.

What maintenance is required for steam humidifiers?

To avoid mineral deposits and microbial growth, steam humidifiers require:

– Daily water changes
– Regular cleaning/disinfecting of tanks
– Descaling agents to remove mineral deposits
– Replacement of filters, wicks, and gaskets

How often do steam humidifier filters need replacement?

Most manufacturers recommend replacing steam humidifier filters every 1-2 months of use. Hard water and frequent operation may require more frequent filter replacements.

Can steam humidifiers lead to mold growth?

Yes, steam humidifiers can promote mold growth if not properly maintained. Mold can grow in mineral deposits or on surfaces where steam condenses. Proper cleaning and disinfecting of tanks, filters, and surfaces is essential.

Are steam humidifiers safe for pets?

Steam humidifiers are generally safe for pets as long as hot surfaces are out of reach to avoid burns. The steam itself is not hazardous. Proper maintenance is key to avoid mold and bacteria that could pose a health risk.

How often should the water tank be cleaned in a steam humidifier?

The water tank or reservoir in a steam humidifier should be drained, cleaned and disinfected daily to help prevent mineral deposits and bacteria growth. Weekly deep cleanings are also recommended.

Can I use a steam humidifier in a bedroom?

Yes, steam humidifiers can be used in bedrooms, but precautions should be taken. Avoid very hot steam emissions. Place the unit far from beds and aim steam away from sleeping areas. Monitor humidity levels to avoid condensation.

Are steam humidifiers energy efficient?

No, steam humidifiers require boiling water so they typically use more energy than other types of humidifiers. Their energy efficiency can be improved by insulating steam lines, proper sizing, and using energy efficient models.

Does water quality affect a steam humidifier?

Yes, hard water with high mineral content can cause scale buildup in steam humidifiers. This requires more frequent maintenance. Using filtered or distilled water can help reduce deposits.

How can I prevent white dust from my steam humidifier?

White dust is caused by mineral deposits from hard water. Change water daily, use distilled or filtered water, clean scale buildup regularly, and replace filters as needed to prevent white dust.

Can I install a steam humidifier myself?

Steam humidifier installation is complex, especially if steam lines need to be run. Hiring a qualified HVAC technician is highly recommended unless you have expertise in steam system installation.

How to Properly Store a Humidifier When Not in Use

Essential Guidelines for Proper Humidifier Storage

Action	Details
Properly storing your humidifier during periods of non-use is crucial to keep it functioning optimally and avoid microbial growth. Leaving residual moisture inside can allow mold, bacteria and fungi to accumulate over time, contaminating the water and releasing harmful spores into the air when used again.
Deep Clean the Humidifier	Drain all water from tank, reservoir, hoses, and filters Scrub tank with vinegar/bleach and rinse Replace filters as recommended Use descaling solutions for mineral deposits Disinfect with antimicrobial cleaner Air dry all parts before reassembling
Dry Out All Moisture	Empty tank water and wipe surfaces dry Remove and air dry filters for at least 48 hours Use absorbent pads inside to wick away moisture Run the humidifier empty for 30 minutes to evaporate internal moisture
Store in a Cool, Dry Location	Good Locations: Closet shelf, dry basement, pantry Bad Locations: Bathroom, damp attic, garage Avoid temperature extremes to prevent damage Cover with a breathable material to avoid dust buildup Store upright to prevent water pooling in crevices Remove batteries to prevent corrosion

The Importance of Complete Drying

Before you store your humidifier away, one crucial step stands above the rest: ensuring complete dryness. Any residual moisture left inside can become a breeding ground for harmful microorganisms like mold and bacteria. These not only pose a risk to the humidifier’s integrity but can also become significant health hazards when the device is next used.

Why It’s Essential:

Mold and bacteria thrive in moist environments. Even a small amount of leftover water can lead to contamination.
When reactivated, a humidifier with microbial growth can spread spores into the air, potentially causing respiratory issues and allergic reactions.

Practical Drying Tips:

Wipe Thoroughly: After cleaning, use a dry, clean cloth to wipe down every component of the humidifier, ensuring no water remains.
Air Dry: Allow all parts, especially the tank and filters, to air dry in a well-ventilated area for at least 24-48 hours. This step cannot be rushed.
Run Empty: Consider running the humidifier on an empty setting for about 30 minutes to evaporate any moisture trapped in hard-to-reach areas.

Monitoring for Mold Growth

Even with diligent drying and cleaning, it’s essential to remain vigilant for signs of mold growth in your humidifier, especially during prolonged storage periods. Mold not only poses a significant health risk but can also damage your humidifier, reducing its efficiency and lifespan.

Key Indicators of Mold Presence:

Visible Signs: Keep an eye out for any mold spots or fuzzy growths on any part of the humidifier.
Odors: A musty or mildew-like smell emanating from the humidifier is a strong indicator of mold growth.
Deposits: Cloudy or colored deposits around crevices, edges, or inside the tank can suggest mold or bacterial buildup.
Filter and Tank: Pay special attention to the filter and water tank, as these areas are particularly prone to mold growth.

Action Steps if Mold is Detected:

Immediate Cleaning: Upon detecting any signs of mold, thoroughly clean and disinfect the entire humidifier.
Part Replacement: Inspect all parts for damage. Replace any components that are heavily affected and cannot be fully cleaned.

Regular checks for mold are crucial, especially before and after storage periods, to ensure your humidifier remains safe and effective for use.

Preparing Your Humidifier for Next Use

After a period of storage, it’s important to ensure your humidifier is clean, functional, and ready for operation. Follow these steps to prepare your humidifier for its next use:

Inspect for Mold or Mineral Buildup: Before using your humidifier, inspect it for any signs of mold or mineral deposits. If any are present, refer back to the cleaning and disinfecting steps.
Check All Parts: Ensure that all components, especially filters and tanks, are in good condition. Replace any parts that show signs of wear or damage.
Run a Cleansing Cycle: Fill the tank with a mixture of water and a small amount of vinegar to run a cleansing cycle. This helps to remove any lingering odors or residues. Rinse thoroughly afterward.

Maintenance During Storage

Even while in storage, your humidifier can benefit from periodic checks and basic maintenance:

Dust Off: Every few months, take out your humidifier to dust it off. This prevents dust accumulation that could clog the vents or affect the device’s performance.
Battery Check: If your humidifier uses batteries for any functionality, ensure they are removed to prevent corrosion over time.
Storage Check: Periodically check the storage environment to ensure it remains dry and cool, without any drastic changes in temperature or humidity that could affect the humidifier.

Frequently Asked Questions

Q: How often should I clean my humidifier before storage?
A: Clean and disinfect your humidifier thoroughly before storing it to prevent mold and bacteria growth. This should be done at least once every 3-6 months or after each use period.

Q: Can I leave water in the humidifier tank during storage?
A: No, it’s crucial to empty and thoroughly dry the tank and all parts of the humidifier to prevent microbial growth.

Q: What should I do if I find mold in my humidifier after storage?
A: Disassemble and clean each part with a mixture of water and vinegar or a manufacturer-recommended cleaning solution. Severely mold-infected parts may need to be replaced.

Q: How long can a humidifier be stored safely?
A: A humidifier can be stored indefinitely if properly cleaned and dried. However, inspect it every few months during storage for any signs of mold or damage.

Q: Is it necessary to replace the filter before storage?
A: Yes, it’s advisable to replace the filter before storage to ensure it’s fresh and clean for the next use. If the humidifier won’t be used for an extended period, consider storing it without the filter and replacing it when you’re ready to use it again.

Q: Can I store my humidifier in the attic or garage?
A: It’s best to avoid storing humidifiers in places with extreme temperature fluctuations or high humidity, such as attics or garages. Opt for a cool, dry location like a closet or pantry.

Q: How do I protect my humidifier from dust during storage?
A: Cover the humidifier with a breathable fabric or store it in its original box or a breathable storage bag to protect it from dust and debris.

Q: What’s the best way to dry a humidifier before storage?
A: After cleaning, leave all parts disassembled in a well-ventilated area to air dry completely. Running the humidifier on an empty setting can also help evaporate residual moisture.

Q: Should I perform any maintenance on my humidifier during its storage period?
A: Periodically check your stored humidifier for dust and any signs of mold. Wipe it down and ensure it’s still in a suitable storage environment.

Q: What kind of cleaning agents are safe for my humidifier?
A: Typically, mild agents like white vinegar or hydrogen peroxide are safe and effective for cleaning humidifiers. Always refer to the manufacturer’s instructions for recommended cleaning solutions to avoid damaging sensitive components.

What is a Humidifier Ionizer?

Lately a mysterious button has started to pop up on a variety of different appliances.

The “ION” button has made its way onto air conditioners, tower fans, and dehumidifiers. Another appliance that has gotten the Ion treatment is the Humidifier.

What is a Humidifier Ionizer?

An Humidifier Ionizer or sometimes called “Anion” humidifier is a humidifier that disperses negative ions and also disperses moisture. Essentially it is a combination appliance that incorporates a humidifier and an ionic air purifier.

An article in the US National Library of Medicine states that when:

Based on the “Lenard effect”, water shearing appliance has been designed to generate NAIs. Water shearing produced only superoxide ions (O2−) which was bound to clusters of water molecules to form the structure O2−(H2O)n , and was essentially regarded as a natural source of NAIs. NAIs generated by the “Lenard effect” might improve erythrocyte deformability, thereby aerobic metabolism. Also “The ionizer had the ability to kill the bacteria, and ion capture dramatically reduced its bactericidal effect”

In Layman’s terms:

Negative Ions can help reduce airborne bacteria

“Think of negative ions as tiny air cleaners. Just like a magnet attracts metal filings, these ions attach to airborne particles like bacteria. Once attached, the particles become too heavy to stay airborne and settle down, effectively cleaning the air around you.”

What does an ion humidifier do?

An ionizer on a humidifier serves two purposes.

Clean the surrounding air as the humidifier adds moisture to the air.
Reduce the level of mold and bacteria associated with humidifiers.

Humidifiers are notorious for the amount of cleaning and maintenance they need to ensure that they do not become a breeding ground for mold and other organisms.

Adding an ionizer function to a humidifier can reduce and even destroy much of the contamination related to this issue.

Anion humidifier benefits

Cleaner air
Comfortable humidity levels
Less chance of the humidifier becoming a germ farm
Negative ions make the atmosphere feel lighter

Humidifier vs. Ionizer

The purpose of a humidifier is to add moisture to a room. Low humidity is usually associated with winter because the climate is typically more dry during those months.

It’s not only the climate dictating the humidity in the winter, it’s also the fact that the house is usually closed up with the furnace running non stop and drying out the air.

And having the house closed up in the winter introduces more problems than one.

Not only does the air become very dry and miserable especially when you have a cold, the air quality begins to become very unhealthy too.

The first place people start with to solve the problem is buying a humidifier.

A humidifier is a must in the winter. Keeping a cool mist humidifier near your bed in the winter can be the difference between getting a good night’s rest or not.

But a humidifier does not solve the problem of the recirculated air quality in your home becoming a breeding ground of germs on its own.

And compounding the issue is the fact that the humidifier must be cleaned often to keep it from becoming a mold distribution machine all on its own.

When a humidifier gets dirty with mold and other organisms then turned on, it disperses mold spores and bacteria into the air and is able to travel further because it is contained in humidity droplets that act like small vehicles for the germs.

An ionizer is a machine that cleans the air by emitting ions. this works because ions have both negative and positive polarities.

When the ions are dispersed from the ionizer they snap together and trap anything in their way inside of the new bond.

As the new bonds clump together, they become too heavy to float and fallout of the ambient air. (The air you breathe)

Can you use an air purifier and humidifier together?

Absolutely, and you should. Indoor air pollution and dry air are both associated with keeping a house closed up with the heater running.

When the furnace is running non-stop it dries out the air which dictates the need of a humidifier.

Keeping the doors and windows shut to keep the furnace doing its job means that the indoor air quality is suffering.

The air in your house must be kept clean as much as the relative humidity kept in the 30 to 50% range.3 ways a humidifier actually performed as an air purifier.

3 Ways a Humidifier can Clean Air

A Humidifier actually affects the air in more ways than just adding moisture. Humidifiers can also have a cleaning effect on the air, alongside adding humidity.

Dust: When the air is dry, dust control can be much more problematic. Adding humidity to the air in a room through a humidifier moistens the dust, causing it to fall to the surface, similar to the cleansing effect of a rainstorm.
Viruses and Bacteria: While humidifiers can be a source of germs if not properly maintained, adding humidity can also encapsulate bacteria in humidity droplets, making them too heavy to float and thus removing them from the air.
The Lenard Effect: Water can be a source of negative ions through the Lenard effect, which involves the formation of negative ions through shearing water. Although the number of negative ions produced by a humidifier may be small, the potential for ion creation exists.

Recap

Have you ever wondered what the ion button on a humidifier is for? Some humidifiers include an ionizer along with their moisturizing function, dispersing ions into the air to make airborne contaminants too heavy to remain suspended. This means they fall out of the air, effectively cleaning it.

An Anion or Ion humidifier not only adds moisture to the air but also offers the option to add ions, enhancing the air quality. But do they work? Ionizer humidifiers are considered beneficial, especially in closed spaces during winter, combining the benefits of both a humidifier and an ionizer.

These devices often use the plasma cluster ion system, one of the most effective ionizing technologies available. The combination of a humidifier and an ionizer can be more synergistic than, for example, a fan ionizer that might not be as effective due to its fast and hard airflow.

Although ion humidifiers are not widely popular, their unique combination offers a specialized solution for air quality improvement, making them a good option for travelers or for use in environments with varying climates.

Devices like the revitalizer, which uses water shearing similar to the “Lenard effect”, and air washers that use water as a filter, also serve as natural humidifiers with added benefits like aromatherapy.

We cover all the common questions and solutions in our full humidifier guide.

Best Water for Humidifier-Distilled, Bottle, Boiled or Tap?

What is the Best Water for a Humidifier?

Distilled water is the best water to use in a humidifier because:

The use of distilled water helps keep your humidifier in good condition. Because of the process in which distilled water is made, It lacks minerals like calcium and magnesium, as well as sodium that can build up inside your humidifier and make it less effective.

Dry air in the Winter causes an array of issues. The skin breaks, the lips shrink and swell, and your nose becomes congested. The worst part is that these issues result from the air you breathe and are surrounded within your home, your own domain.
A humidifier is a device that can help avoid these issues. It can help bring the humidity to a level that is comfortable and much more healthy for the people in your home.
However, there are some disadvantages to using a humidifier incorrectly. It can increase maintenance expenses. It can also affect the quality of air in your home.
If you want to use your humidifier properly, the first thing you’ll need to be aware of is the kind of water you should be filling it with.
More questions? Visit our complete Humidifier Guide.

Water Types Compared

Water Type	Pros	Cons
Distilled Water	No minerals → prevents scaling Lower mold/bacteria risk Minimizes white dust	Must be purchased Not always convenient
Bottled Water	Filtered — fewer contaminants than tap Easy to find	Still contains minerals Can cause scaling over time
Filtered Water	Better than tap water Removes some chlorine & sediments	Still has minerals & some chemicals Possible mold/bacteria growth
Boiled Water	Kills bacteria & microorganisms Can be made at home	Minerals remain Must cool before use Can damage plastic tanks if too hot
Tap Water	Convenient Free	High mineral content → scaling May contain chlorine, fluoride Increases white dust Encourages mold growth

Distilled Water for Humidifier

Distilled drinking water is the most suitable kind of water to use in a humidifier. It has been processed to get rid of contaminants like bacteria and minerals. Particles that you do not want in your air or your humidifier.

Think about it…

The bacteria in your water can end up being in the air that you are breathing since it’s going through a humidifier. And Minerals and other particulates can end up damaging your unit and reducing the life of your humidifier.

Distilled water is produced when boiling water evaporates into steam and then cools. The process causes the impurities in the water to be left behind as it turns into condensation. The condensation is collected and bottled as “distilled water”

Mold Prevention. Mold growing in a humidifier is one the biggest problems people face when using one. Distilled water is less likely to have mold spores present in it. Which will help keep mold and bacteria from taking root as quickly in the humidifier.

Less Dusty Humidifier dust is caused by the minerals that are in tap water and drinking water. Because distilled water is treated to eliminate the minerals, it will help keep the problem of “humidifier dust” to a minimum.

Tap water in a humidifier?

Tap water for humidifiers is not advised. Tap water is typically a source of solids and minerals that could harm your humidifier. Tap water can result in calcium deposits developing inside of your humidifier.

Utilizing tap water for your humidifier can cause also lower the quality of your ambient air. It is is loaded with chemicals like fluoride that when moved through a humidifier become part of the air you breathe.

Also the white “humidifier dust” that appears on the surfaces around the humidifier can be kicked up into the air. Which will not only inhibit your breathing, will dry out your skin. One of the very things that you wanted a humidifier for in the first place.

In order for mold to grow, it requires three different ingredients; water, low light, and a food source.

Tap water is loaded with minerals that can be considered the food source for mold to grow.

Though It is recommended to clean or replace the humidifier’s filter frequently and also clean the inside of any mineral build-up, using tap water will increase the frequency of replacing filters and increase your cleaning schedule..

Demineralization cartridges are available on many humidifiers and can be bought separately if you decide that using tap water is worth the risk.

Bottled Water in a Humidifier?

Using bottled water in a humidifier is only slightly better than using tap water. It is filtered but not to the point that it is free of the minerals that can cause deposits in your humidifier.

A lot of bottled drinking water that you find on the shelf is natural spring water or at least that’s supposed to be the origin.

Natural spring water naturally has a lot of minerals and solids that will end up making your humidifier less effective.

If you read the label good on most bottled water, you will see that it says that minerals have been put back into the water for consumption.

But not to the point or the quantity that you will get from just putting plain tap water into your humidifier. So even though bottled water may not be the best water for a humidifier, it is a step up from tap water.

Should I use filtered water in my humidifier?

Using filtered water in a humidifier is better than using water straight out of the tap. But even filtered water is not 100% pure of minerals and other solids that can end up doing damage to your humidifier.

And water filters are not able to get rid of all the fluoride and chlorine that is in tap water.

Though it is better than using tap water, filtered water still has much of the mineralization and propensity to develop mold and bacteria.

Should I boil the water I use in my humidifier?

Boiling water is a do it yourself technique for humidifying your home without the use of a humidifier. When water is boiled it turns into steam and evaporates.

Boiling water also kills any microorganisms in the water.

But, the pot that you boil the water in is full of deposits and minerals left behind from the tap water.

If you pour the water directly out of the pot into the humidifier, much of the deposits that have been boiled out of the water will get back into the water.

The very thing you’re trying to avoid.

Much is made about how vaporizers and warm mist humidifiers are not as likely to develop mold and bacteria in them because the water is brought to a boiling point that kills the organisms.

But you have to remember that minerals and deposits are left behind when you boil water.

Even in the case of vaporizers, distilled water is going to be the best water to use in your warm mist humidifier.

Caution: And remember that the humidifier is made out of plastic. Pouring boiling water into it, is going to melt it. Let it cool first if you decide to do it this way.

Should I put hot or cold water in my humidifier?

Humidifiers do not need to have the water brought to any certain temperature before pouring it into the basin.

Normal room temperature is adequate.

Some might get the idea of that because a vaporizer uses steam to humidify, that you have to put boiling water in it for it to work.

Not so. The humidifier is built to warm the water on its own and does not require you to do anything besides fill it with room temperature distilled water.

But by the same token, if you pour cold drinking water out of the refrigerator into a vaporizer, it’s going to take that much longer to work because it takes longer for cold water to get to a boiling point.

So just stick with room temperature.

And excessive cold or hot temperatures are not good for plastic and will eventually cause plastic to crack.

Recap

Distilled water is the best water to use in a humidifier because it goes through a process that eliminates the most minerals and microorganisms that can damage your humidifier and get into the air you breathe when you put them through a humidifier.

It also is the best water to avoid the white dust that builds up around humidifiers.

Bottle drinking water is a little better than using straight tap water in a humidifier but it’s still contains a great deal of the minerals that can cause a humidifier to scale up and be less effective.

And it is the minerals in the water that eventually become the white dust that you see settling around a humidifier.

Boiled water does have the advantage of killing the spores and bacteria that can be in your average tap water, but when you boil water, the mineral deposit settle at the bottom.

If you pour that water into a humidifier, you still have the problem of the mineral deposits getting into the humidifier.

Lastly, tap water is easily the worst water you can use in a humidifier.

It is full of minerals and chemical treatments that will not only eventually damage your humidifier, will become part of the air you breathe when you use the water to humidify the air.

Tap water also becomes moldier faster and leaves the white dust that you were trying to avoid around your humidifier faster.

Expert Tips for Sizing and Installing Flow-Through Humidifiers

Introduction to Flow-Through Humidifiers

Welcome to our comprehensive guide on residential humidification systems, with a focus on flow-through humidifiers, an essential category of whole-home humidification.

Flow-through humidifiers are highly effective in evenly distributing moisture throughout an entire house, seamlessly integrating with your existing HVAC system.

In this article, we’ll delve into the world of flow-through humidifiers, covering their operation, types, installation, maintenance, troubleshooting, and more.

If you’re new to the topic of residential humidification, consider starting with our main guide. Also, explore our series of articles that delve into different humidifier technologies, such as ultrasonic, evaporative, and steam models.

Now, let’s dive into the world of flow-through humidifiers, which offer automation, efficiency, and optimal indoor air humidity when properly installed and maintained. Don’t miss our in-depth Humidifier Guide.

What is a Flow-Through Humidifier?

A flow-through humidifier is a type of humidifier that connects directly to your home’s plumbing and HVAC system, adding moisture to the air. The process involves water flowing through the humidifier, where a filter, wick, or membrane absorbs the water and exposes it to the HVAC system’s airflow.

How Does a Flow-Through Humidifier Work?

Here’s a simplified overview of how a flow-through humidifier operates:

Water enters the humidifier from your home’s plumbing system.
The water passes through a filter, wick, or membrane that absorbs it.
Air from the HVAC system flows over the moistened filter/wick/membrane.
Moisture evaporates from the filter/wick/membrane into the airflow.
The humidified air continues through the HVAC system into your home.

Benefits of Using a Flow-Through Humidifier

Flow-through humidifiers offer various advantages:

Evenly distribute moisture throughout your entire home.
Require less maintenance than portable humidifiers.
Do not take up space in your living areas.
Can provide automatic humidistat control.

Who Can Benefit from Using a Flow-Through Humidifier?

Flow-through humidifiers are ideal for:

Homeowners in dry climates.
Individuals with respiratory conditions aggravated by dry air.
Homes with forced air heating systems.
Large homes that are challenging to humidify with portable models.

Types of Flow-Through Humidifiers

Flow-through humidifiers come in two main types:

Bypass Humidifiers

Description: A portion of the air is diverted through a wetted pad or filter.
Pros: Less likely to breed bacteria, no water boiling required.
Cons: Require more maintenance than power models.

Power Humidifiers

Description: Air is blown through a rotating disk that disperses water into the airflow.
Pros: Require less maintenance, no stationary wick or filter to clean.
Cons: May allow more bacterial growth, require a boiling water reservoir.

Installation and Maintenance

How to DIY Install a Flow-Through Humidifier

Determine the optimal location on your home’s HVAC system for installation.
Shut off the water supply and power to the HVAC system.
Follow the manufacturer’s instructions to mount the humidifier and connect it to the water and HVAC ductwork.
Seal all connections with tape to prevent air leaks.
Turn the water and power back on and test for leaks.

How to Clean a Flow-Through Humidifier

Turn off the water supply and power.
Remove any scale buildup.
For bypass models, replace the wick/filter per the manufacturer’s instructions.
Remove and clean the rotating disk on power models.
Reassemble and turn the water and power back on.

Maintenance Requirements for Flow-Through Humidifiers

Perform annual cleaning as described above.
Regularly replace the filter every 1-2 months.
Check for leaks and test the humidistat calibration.

Troubleshooting Common Problems

Why Isn’t My Flow-Through Humidifier Working?

Check if the water supply valve is turned on.
Test if the humidistat is set high enough.
Clean the filter or wick if it’s dirty.
Replace any defective parts like solenoid valves.

How Do I Fix a Leaky Flow-Through Humidifier?

Tighten any loose fittings.
Replace worn-out gaskets and seals.
Clean limescale buildup around fittings.
Repair any cracks in the evaporation chambers.

How Do I Get Rid of White Dust from My Flow-Through Humidifier?

Regularly clean and replace filters.
Use distilled or demineralized water.
Consider installing a reverse osmosis pre-filter.

Sizing Guide

Choosing the right-sized flow-through humidifier for your home is crucial to provide adequate moisture without over-humidifying. Follow these tips:

Calculate the square footage of your living space (generally, you need 1 gallon of moisture per 100 square feet).
Consider the number of occupants (around 10 gallons of moisture per person).
Check the capacity of your HVAC system and size the humidifier to the air handler’s specifications.
Select a model with an adjustable humidistat for fine-tuning moisture output.
For very dry climates or large, open floor plans, consider larger units or multiple units.

Humidistat Settings

The humidistat controls the level of moisture that the flow-through humidifier adds to your home. Follow these guidelines:

Start at 35% relative humidity and monitor comfort.
Slowly increase to 45% if more humidity is needed.
For infants and health conditions, 30-40% is recommended.
To prevent mold, keep it under 50% maximum.
Adjust seasonally to account for changes in climate.
Allow 24 hours for the humidistat to stabilize at a new setting before readjusting.

Health Benefits

Proper humidity levels between 30-50% can offer numerous health and comfort benefits, such as:

Alleviating symptoms of allergies, asthma, sinusitis, and other respiratory issues.
Preventing dry skin, cracked lips, bloody noses, and skin irritation.
Reducing the likelihood of cold and flu virus spread.
Soothing irritated eyes and contact lens discomfort.
Lowering the chances of vocal cord strain and respiratory infections.
Preventing dryness that can damage musical instruments.

Energy Savings

Maintaining proper humidity with a flow-through humidifier can improve your HVAC system’s efficiency:

Humidity allows the air to retain heat better, enabling a lower thermostat setting.
Humid air feels warmer, allowing you to lower the thermostat by 2-3°F without sacrificing comfort.
Fewer cycles of the HVAC system lead to improved moisture retention.
Estimated annual savings on heating and cooling costs range from 5-15%.

Sizing Recommendations

Here’s a general guideline for the humidity output needed based on home size:

500 sq ft: 1-2 gallons per day
1000 sq ft: 2-4 gallons per day
1500 sq ft: 3-6 gallons per day
2000 sq ft: 4-8 gallons per day
250

0+ sq ft: 5-10+ gallons per day

Remember to consider climate and the number of occupants when sizing the humidifier.

Humidity Level Guidelines

Here are some recommended humidity ranges and their associated benefits:

30-40%: Ideal for infants and allergy/asthma sufferers.
35-45%: Comfortable for most homes.
45-50%: Maximum humidity level before risking mold growth.

Monitor the humidity with a hygrometer and adjust the humidistat seasonally.

Frequently Asked Questions

What is the ideal humidity level for a home?
Between 30-50% relative humidity is recommended. Levels lower than 30% can be unhealthy, while levels higher than 50% encourage mold growth.

How do I know if my home needs a humidifier?
Signs include static electricity shocks, dry skin, cracked wood furniture, and windows fogging up. You can use a hygrometer to test your home’s humidity levels.

What size flow-through humidifier do I need?
Consider the square footage of your home and your HVAC system’s capacity to determine the appropriate moisture output, typically 20-30 gallons per day for an average home.

Can I install a flow-through humidifier myself?
Flow-through humidifiers require integration into your HVAC system, which should be done by an HVAC professional for optimal performance and safety.

How often do flow-through humidifiers need maintenance?
In general, it’s recommended to clean and replace filters annually before the heating season. Refer to the manufacturer’s guidelines for specific model maintenance recommendations.

How much does it cost to run a flow-through humidifier?
Operating costs are low, similar to running a furnace blower. Newer computerized models can optimize moisture output for even more efficiency.

What temperature should the water be for a flow-through humidifier?
Cold tap water is suitable in most cases. Some evaporative types may require warmer water. Check your specific humidifier’s manual for guidance.

Can flow-through humidifiers over-humidify a home?
Yes, a malfunctioning unit or incorrect humidistat setting can make the air too damp. The ideal relative humidity is 30-50%.

How can I improve the air quality from my flow-through humidifier?
Use distilled water to reduce mineral dust. Replace filters as per the manufacturer’s schedule. Regularly disinfect evaporative tanks.

Are flow-through humidifiers safe for pets and children?
When installed correctly by an HVAC professional and maintained properly, flow-through humidifiers are safe and hygienic.

Conclusion

Pros and Cons of Using a Flow-Through Humidifier

Pros:

Evenly distribute moisture throughout the entire home.
Automatic control with a humidistat.
Do not take up space in living areas.

Cons:

Higher upfront cost.
Requires professional installation.
Additional maintenance is required.

Alternatives to Flow-Through Humidifiers

Portable humidifiers.
Built-in evaporative systems.
Steam vaporizers.
Smart WiFi-enabled humidifiers.

Vaporizer vs Warm Mist Humidifier ( 21 Answers-Updated )

Two peas in a pod. Six of one half dozen of the other. Looks like a duck, quacks like a duck, must be a duck…

These are all phrases that remind me of a Vaporizer vs Warm Mist Humidifier compared.

What is the difference between a Vaporizer and a Warm Mist Humidifier?

A warm mist humidifier is essentially the same product as a vaporizer.

Only a Vaporizer typically comes with a chest rub additive to disseminate a soothing vapor into the air.

Both the warm mist humidifier and a vaporizer use the method of boiling water to create steam.

And steam happens to be a warm mist…

A cool mist humidifier on the other hand does not create steam like a warm mist humidifier or vaporizer.

It is a system of basically dispersing a cloud of fine water droplets into the air that are cool or at least room temperature.

Humidifier vs Vaporizer

Cool mist humidifiers according to Mayo clinic offer more relief for congestion and cold symptoms than warm mist humidifiers or vaporizers.

Conclusion:

Warm mist humidifier and vaporizer are two appliances that do the same thing. As humidity to the air through the creation of steam. A cool mist humidifier adds humidity to the air by dispersing cool humidity droplets into the air.

What is a waterless vaporizer?

Imagine if you combined Vicks vapor rub with a Glade plug-in air freshener, That’s essentially what a waterless vaporizer is.

If you are looking for a way to disperse Vicks vapor rub into the air without adding humidity through the air, Waterless vaporizers or an excellent product.

And because most parents do not want to have a machine that is boiling water in their children’s room, waterless vaporizers are an excellent way to help your little ones breathe easier at night.

Warning: Waterless vaporizers may not be safe for infants under 6 months old because they can be too strong and irritate their airways.

Waterless vaporizers can also combine with a cool mist humidifier with no issues.

What’s the difference between a waterless vaporizer and a diffuser?

Both a waterless vaporizer and a diffuser disperse vapors into the air that can be beneficial and help with breathing.

But the difference in price is somewhat significant.

A waterless vaporizer is a convenient plugin that can be refilled easily for a small price. $12.

On the flip side

Although the diffuser itself is usually inexpensive, it does require essential oils to add in order to have something to disperse.

That’s where the real price is.

Some essential oils that are known to be good for colds and breathing like peppermint can run in the $30 range.

Frankincense, another essential oil known for being very beneficial but can run in the $70 range just for the one oil.

Diffuser vs. Humidifier

Do you get the feeling we’re going around in circles?

Humidifiers and diffusers can share in a few functions but they are made for two different things.

The humidifier is made to add humidity to the air and that is its primary function.

A diffuser is made to disperse essential oils into the air and that is its central purpose.

Where they have commonalities is that they are both made to help you breathe easier.

And there are certain humidifiers that come with a tray to add essential oils making it essentially an essential oil diffuser / humidifier. Essentially…

But though you can purchase a humidifier that can double as a diffuser, not all diffusers can return the favor.

	Ultrasonic Diffuser	Nebulizer
Mechanism of Action	Uses ultrasonic vibrations to break down essential oils into micro-particles dispersed into the air.	Uses compressed air to atomize medications into an inhalable mist.
Intended Use	Aromatherapy – disperses essential oils into the air.	Medical device to deliver medications directly to the lungs.
What They Diffuse	Water and essential oils.	Medications prescribed by a doctor, like asthma medications.
Particle Size	Micrometer range.	<5 microns to reach lower airways.
Treatment Effects	Provides aromatherapy benefits.	Delivers medications deeper into lungs to treat respiratory conditions.
Portability	Available in portable, handheld battery or electric models.	Available in portable, handheld battery or electric models.
Noise Level	Very quiet.	Noisier due to compressed air.

Ultrasonic diffuser vs nebulizer

Diffusers come in two different types. Ultrasonic and Nebulizer.

Ultrasonic diffusers have a water basin that you fill with water and add your aromatherapy oils into.

And just like a cool mist humidifier, it mist the air with tiny droplets of water.

The difference is the water is combined with the scents.

An ultrasonic diffuser can be used as a humidifier simply by leaving the oils out of the water.

But..

A nebulizer diffuser does not use water and since the oils are not diluted in water, the nebulizer diffuser is much stronger.

The takeaway is that if you’re wanting to combine the moisture of a humidifier with the therapeutic and medicinal effects of a diffuser, The only choice is the ultrasonic diffuser.

What’s the Best choice?

The Ultrasonic diffuser combines all the functions of a humidifier, a waterless vaporizer, and a essential oil diffuser.

Of course, individually these appliances may have their strengths when bought separately, an ultrasonic diffuser who’s the best combination device to get the best out of all worlds.

Do you want us to take it a step further?

There is a device called a “Revitalizer”

A revitalizer is a combination humidifier, essential oil diffuser, and air purifier.

Imagine a humidifier that pulls air into a basin, slushes the water around to clean the air, then releases the air combined with essential oil aroma.

That’s what a Revitalizer is and does.

Still with me?

How about an “Air washer”?

Air washers are air purifiers that can clean the air up to about 250 square feet by using water as a filter.

Air washers are also available with essential oils and double as humidifiers.

But the caveat here is that both revitalizer and air washers supply their own essential oils that are formulated to not gum up any working parts on the machines.

Sum it up

So many machines that are so similar.

Vaporizers, warm mist humidifiers, ultrasonic diffusers, waterless vaporizers, revitalizers, and air washers all share most of the same functions.

They all add humidity to the air and they all diffuse aromas into the air.

And with the revitalizer and air washer, you also have an air purifier to boot.

As you can imagine, these machines all have their strengths when used individually.

For instance, a vaporizer uses boiling water to create steam. That makes it a much cleaner machine and offers the benefits of steam to help with congestion.

A nebulizer diffuser as an individual product is a much stronger aromatherapy diffuser than an ultrasonic diffuser that is combined with other functions.

And a air washer is primarily an air purifier that can double as a humidifier with essential oil additives.

But as a combination product I would choose an ultrasonic diffuser because it offers a good balance between humidifier and diffuser.

And I would leave the air purification to other technologies that are much better at improving air quality than revitalizers.

Q&A

Do warm mist humidifiers leave white dust?

Warm mist humidifiers do not release or leave white dust? The reason is, warm mist humidifiers or vaporizers boil the water to create steam which essentially puts it through a distillation process. White dust from humidifiers comes from minerals and deposits in undistilled water.

Do warm mist humidifiers use a lot of electricity?

Warmest humidifiers or vaporizers compared to other types of humidifiers are the most expensive energy wise. But the initial cost is usually less expensive for a standalone vaporizer that doesn’t combine lots of extras.

Do warm mist humidifiers make the room warm?

Warm mist humidifiers or vaporizers create a sauna type atmosphere around the humidifier that can raise the temperature of the room, making the room feel warm, especially in the area surrounding the humidifier.

Do warm mist humidifiers cause mold?

Warmest humidifiers do not cause mold when correctly used. The purpose of a humidifier is to add moisture to the air when the atmosphere is too dry. Mold is caused by excessive humidity. A humidifier should be shut off when the humidity has reached 32-50%. A warm mist humidifier combined with a hydrometer or used with a hygrometer will not produce enough humidity for mold to take root.

Do warm mist humidifiers breed bacteria?

Warmest humidifiers or vaporizers breed less bacteria than other types of humidifiers because they boil water as a method of creating steam. The boiling process kills most bacteria in the process. But like any appliance that uses water that has a potential to sit, it must be clean regularly and emptied when not in use.

Does a cool mist humidifier make the room cold?

Cool mist humidifiers create a cool breeze directly in front of the humidifier. But the amount of cool mist it creates is not enough to change the temperature or cool off an entire room.

Can you overuse a humidifier?

The way to overuse a humidifier is to keep it running once the optimal humidity in a room is reached. Continuing to use a humidifier when the humidity is already adequate, you risk over humidifying which can lead to mold production and dust mites.

Can a vaporizer cause headaches?

A vaporizer will not cause headaches because it is basically a machine that emits steam.

But some people can be sensitive to the additives like Vicks or eucalyptus because they contain camfor which is a strong methylated smell.

Can I add lemon juice to my humidifier?

Lemon juice is a great additive to put in humidifier water because it will not gum up any parts and will add a fresh citrus fragrance to the air. It will also aid with hindering mold and bacteria growth and is an excellent natural way to reduce mold and bacteria.

Does a vaporizer increase humidity?

Vaporizers increase the humidity in a room by manufacturing and emitting steam into the air. Vaporizers are also called warm mist humidifiers. The primary function of a humidifier is to increase the humidity in a room.

Can I use essential oil in an ultrasonic humidifier?

You can put essential oils in an ultrasonic humidifier provided the humidifier is outfitted with an oil scent tray. Putting oils directly into the water is not advised because of the chance and likelihood of clogging.

What’s the difference between a Waterless vaporizer and a humidifier?

The difference between a humidifier and a waterless vaporizer is that the primary function of a humidifier is to add moisture to the air in a room. Whereas the primary function of a waterless vaporizer is to disperse medicated aromas is like Vicks into the air. A waterless vaporizer does not add any moisture to the air whatsoever.

What is the healthiest type of humidifier?

The healthiest type of humidifier is a humidifier that:

Uses Anti-Mold Materials or is equipped with ultraviolet light
Is equipped with a hygrometer and automatically shuts off when the optimal humidity level is reached.
Is capable of producing cool mist humidity or warm mist humidity
Has an aromatherapy tray to medicinal oils such as eucalyptus

Is warm or cool Mist humidifier best for sinuses?

Both a warm mist humidifier and a cool mist humidifier has their advantages when it comes to helping with sinus relief.

A cool mist humidifier can help ease a dry nasal cavity quickly. But a warm mist humidifier can be used with essential oils that add medicinal properties to the air that aid with sinus relief.

Cool mist humidifiers are usually better for sleeping but also have the greater advantage of producing mold and bacteria which can be an irritant to your sinuses.

Can a warm mist humidifier make you sick?

A warm mist humidifier has a lesser chance of making a person sick because it is able to keep mold and bacteria from growing in it easier than a cool mist humidifier.

Any humidifier has a chance of making a person sick when it is under maintained or has been allowed to have water sit stagnant in it.

Humidifiers require astute attention to maintenance and cleaning or they can become a source of illness and discomfort other than being the relief they are intended to be.

Using a humidifier, regardless of whether it is a warm mist or a cool mist, when the humidity is already adequate can also add too much humidity to a room which can promote mold and become a source of food for dust mites. Which both are known to be household allergens.

Does a vaporizer help sore throat?

A vaporizer can help a sore dry throat because it adds moisture to the air and dry air can be a big component of a sore throat.

Furthermore, Vaporizers usually have an aromatherapy tray or compartment that you can add a medicinal oil or salve. Many essential oils that provide relief from cold symptoms are menthol based and can be compared to the same ingredients in throat lozenges. Vaporizers can supply a similar type of relief from sore throat.

Why does my humidifier have white dust around it?

Is White Dust From a Humidifier Dangerous?

How to clean the white dust off of your humidifier?

What can be done about the white dust that gets on your humidifier?

1. Clean the humidifier more often

2. Switch the type of water

So what kind of water should you use in a humidifier?

A. Distilled water

B. Boiled water

C. Filtered water

D. Vaporizer/ warm mist humidifier

Is Leaving a Humidifier Running All Night Safe?

Why Use a Humidifier While Sleeping?

Potential Risks of All-Night Humidifier Use

Best Humidifiers for All-Night Use

Ultrasonic Cool Mist Humidifiers

Warm Mist Humidifiers

Evaporative Humidifiers

Room Steam Vaporizers

Safety Tips for All-Night Operation

Pick the Right Spot

Monitor the Moisture Levels

Keep the Tank Clean

Air Out the Room

Monitor Usage

Ideal Humidity Levels for Sleeping

Troubleshooting Humidifiers Running Overnight

Condensation Forms on Windows

Mold Growth in Tank or on Filters

Mineral Dust on Surfaces

Respiratory Irritation When Used

Main Points on Overnight Humidifier Safety

Have You Heard of Putting Hydrogen Peroxide in a Humidifier?

Hydrogen Peroxide in Humidifiers: Why It’s So Controversial

Why Some People Use Hydrogen Peroxide in a Humidifier

1. Inhaling Hydrogen Peroxide for Respiratory Relief

2. Disinfecting the Air

3. Keeping the Humidifier Clean

Can You Use Hydrogen Peroxide to Clean a Humidifier?

The Other Side of the Story: Alternative Health Perspectives

What About Gargling with Hydrogen Peroxide?

So… Should You Put Hydrogen Peroxide in Your Humidifier?

Safety Warning

Final Thoughts: Just Because It Feels Familiar, Doesn’t Mean It’s Safe

Why You Shouldn’t Use Tap Water in a CPAP

A Real-World Example: What Happened When My Wife Used Tap Water

What Happens If You Use Tap Water?

Water Types Compared for CPAP Use

The Cost of Repairs vs. Distilled Water

Why Protecting Your CPAP Matters

Quick Checklist: Caring for Your CPAP Humidifier

Health Risks of Using the Wrong Water

What If You Don’t Have Distilled Water?

Travel Tips for CPAP Users

Lesson Learned: Distilled Water Is Cheap Protection

CPAP Water FAQs

What happens if I accidentally used tap water one night?

Can I use bottled water in my CPAP?

Can I boil tap water to make it safe for my CPAP?

How often should I clean my CPAP water chamber?

What happens if I keep using tap water anyway?

What is a Whole House Steam Humidifier?

Benefits of using a steam humidifier:

Types of steam humidifiers:

Comparison of Steam Humidifiers with Other Types

Who can benefit from a steam humidifier?

Is it true that steam humidifiers are the best for avoiding the dangers of humidifiers mold and bacteria?

Are Steam Whole House Humidifiers better at avoiding mold and bacteria than the other types of whole house humidifiers?

Do You Need A Boiler Present?

FAQ

How do steam humidifiers increase humidity?

What maintenance is required for steam humidifiers?

How often do steam humidifier filters need replacement?

Can steam humidifiers lead to mold growth?

Are steam humidifiers safe for pets?

How often should the water tank be cleaned in a steam humidifier?

Can I use a steam humidifier in a bedroom?

Are steam humidifiers energy efficient?

Does water quality affect a steam humidifier?

How can I prevent white dust from my steam humidifier?