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H900BL Ultrasonic Cool Mist Humidifier by PureGuardian® H900BL Ultrasonic Cool Mist Humidifier by PureGuardian®
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H900BL Ultrasonic Cool Mist Humidifier by PureGuardian®

Availability: Out of stock SKU: H900BL
MSRP: $39.99


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3 Year Limited Warranty Free Support SSL Secure
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Product Information

The 10-hour* Ultrasonic Cool Mist Humidifier guards against problems caused by dry air in the home. Cleanliness matters! Unlike other humidifiers that grow slimy mold on the water tank surface, Silver Clean™ Protection is embedded in the tank to fight the growth of mold and mildew on the surface of the water tank.

Thanks to ultrasonic technology, it disperses a soothing, cool mist into the air and is ultra-quiet making it ideal to have on while you sleep. It is great for tabletops due to its compact size.

A low water indicator light lets you know when it’s time to refill the water tank and the night light feature makes it a great addition to kids’ rooms!  PureGuardian® humidifiers create a better home environment for those suffering from colds, allergies and dry skin. Order yours now! 

Note: Run time is based off of running the unit on low speed, also depends on atmospheric conditions.

It is important to only use GENUINE Guardian Technologies™ replacement parts to maintain product performance.

Ideal For

  • Small rooms


Mold & Mildew Resistant Tank
Silver Clean™ Technology: The water tank has been treated with a fungistatic agent to protect the surface of the tank from fungal and mold growth.

Cool Mist Humidification
Optimize comfort with soothing low and high cool mist settings

No Added Costs
No evaporating pads, wicks or filters to clean or replace.

Ultra-Quiet Operation
Ultrasonic technology is ultra-quiet when running making it easy to have on while you sleep.

Space-Saving Design
Compact design is perfect for your nursery or desktop and features an optional night light

Low Water Indicator
Lets you know when it’s time to refill the water tank.

Additional Features:

  • Up to 10-hour run time*
  • .17 gallon tank capacity
  • Directional Mist Nozzle
  • Low Water Indicator
  • Auto Shut-Off
  • 7.5-inches tall

Product Specifications

  • SKU: H900BL
  • Weight: 1.1lbs.
  • Dimensions: 3.54 x 6.2 x 7.48
  • Cord Length: 5'
  • Construction: Plastic
  • Run Time: Up to 10 hours
  • Manual: H900BL PDF Manual
  • The Guardian Technologies™ PureGuardian® Ultrasonic Humidifier uses a metal diaphragm vibrating at an ultrasonic frequency to create water droplets that are expelled out into the room to help maintain the desired humidity level. An ultrasonic humidifier is virtually silent when operating.

  • Why should I use a humidifier?
    People need a certain level of humidity to be comfortable. In the winter, indoor humidity can be extremely low, and the lack of humidity can dry out your skin and mucous membranes. Low humidity also makes the air feel colder than it actually is. Dry air can also dry out the wood in the walls and floors of our houses. As the drying wood shrinks, it can cause creaks in floors and cracks in drywall and plaster. Dry air also increases static electricity.

    Does the product require regular cleaning?
    It is recommended to wipe out the water tank and base of the product on a regular basis; approximately every 1–2 weeks (depending on use). The Guardian Technologies™ PureGuardian® Ultrasonic Humidifier has Silver Clean™ technology in the water tank, which helps to fight the growth of mold and mildew on the surface of the water tank.

    When storing the unit, it is recommended to pour any excess water out and clean it with a soft, damp cloth. Let dry completely before storing.

    Are there any wicks or evaporating pads to replace?
    There are no wicks or pads to replace.

    What is ultrasonic technology?
    An ultrasonic humidifier uses a metal diaphragm vibrating at an ultrasonic frequency to create water droplets. Thanks to ultrasonic technology, the Guardian Technologies™ humidifier is virtually silent when running, making it easy to have on while you sleep.

    What is Silver Clean™ technology, and why is it used in your humidifier?
    Silver Clean™ technology is small particles of silver embedded in the tank to fight the growth of mold and mildew on the surface of the water tank.

    Where should I use the product?
    It is recommended that you place the product up on a table or nightstand and not on the floor.

    What is a comfortable humidity level?
    Forty to fifty-five percent (40–55%) humidity is considered within the comfortable range. Any humidity level below thirty percent (30%) is considered dry.

    Do I need to put in a certain type of water for my humidifier to work?
    You can use either distilled or regular tap water. If you have a high mineral content in your tap water, it may be preferable to use distilled water. Since distilled water is likely to contain lower mineral content than most tap water, it will prevent less build-up.

    How long is the warranty?
    The warranty is 3-years limited. For detailed warranty specifications, please refer to the warranty section in the instruction manual.

    If you have further questions, please contact us at 1-866-603-5900

  • By completing this form, you agree to be automatically added to our marketing lists. We promise to respect your privacy. You can opt-out by clicking unsubscribe from any email you may receive from us.

    To read the full warranty, click here.

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By: Margaret Van Allen

Great nightlight and easy to clean

Small and compact. We use this in our toddlers bedroom. Great nightlight and easy to clean.

By: Andrew

My baby will grow up healthy

This humidifier has helped my newborn sleep well.

By: Bliss

A great five-cent cigar

This humidifier does an awesome job, is easy to operate, doesn't collect mold, fits nicely on any tabletop, and raises the humidity in my gas-heated home by several degrees. And it's priced right! I have purchased two of these; one for the bedroom and one for the living room and couldn't be more pleased. I've tried several others in the past but none can compare to this one. I highly recommend it.

By: Kimball

Quiet, effective, simple

My daughter is asthmatic, and we've been through several (4-5) different humidifiers over the last few years to help keep it in control. We've owned this one for quite some time now, and it has been great for us for several reasons:

1) My 6 year old is able to fill it up each night all by herself.
2) The water reservoir really does stay clean
3) Does not easily spill in a young, active child's room.

By: chelput

Wonderful little machine! With antibacterial silver to boot

I love this little machine. It's quiet! It runs at various levels for use a 4 hour 6 hour and 10 hour setting. It also has a nightlight! This sits next to my bed every night. I have a humidity monitor as well to figure out what range to place it on.
I used it when I was sick placing menthol and peppermint air mist liquid in it.
It stopped my bloody noses.
I bought this for my father and younger cousins.
The antibacterial silver is amazing!
Also there is no pooling of water it's all vapor
So clean quiet and wonderful

Con - yes you do have to fill it every night but it's great for saving space

By: B. Milberry

Wonderful for the bedroom

I love this little humidifier. It's perfect for my bedroom at night during the dry winter months. Lasts me all night and simple to refill. You can turn the light on and off. The ONLY thing I wish is that you could have the light stay on but not change color. But I highly recommend this. I'm buying a second one for my Mother's room. It's very quiet.

By: Christine W.


It lasts all night and does not make a sound! Its perfect for my small room! The light on the front of it is pretty bright.

By: Dawn Soponski

Perfect for bedside!

I got the first unit with relatively low expectations, thinking this would be fun for my son to have in his bedroom since it lights up as well. I was shocked at how easy it is to maintain and how long it has lasted!! It worked so well that I have since bought two additional units for our other bedrooms. On the low setting it does last the full 10hrs advertised. On the high setting it lasts at least 5hrs. My son loves filling these every night before bed, and it has replaced his nightlight, too :) With reasonable expectations this product is simple, effective and well worth the low price point vs comparable units. We've used this humidifier nightly for over a year and I'm very pleased.

By: Allen

I would buy a 2nd

Works good, but didn't get the one that was in the photo. No big deal, it did it's job well.

By: Mr. Walker

Effective and easy to use

We have been using this for a couple months. It is easy to fill and operate, and easy to clean. It is very quiet. The light changes color when that function is on, but we usually leave the light off. I can tell that the humidity helps our skin and breathing to be less dry this winter.

Overall it is compact, convenient, easy to use and fill, and decreases dryness.

By: C. Scrivo "cms1230"

A quiet, effective humidifier

We were looking for a humidifier to use in the bedroom. The old one was so loud that it woke us up!
This model was surprising, because it sits on the night table, it's small, but it's virtually silent, and throws out
enough vapor to be very effective. And lasts all night. A great and inexpensive product.

By: patricia brooks

really like the product

Works really well. The item was smaller than I anticipated. Very quiet and works really well. I had on low setting and it lasted about 9 hours which was good for us. Very happy with the product. Recommend this product

By: Erenz "erenz"


I bought this to use in my cubicle at work and it is the perfect size. Super easy to use, quiet, and doesn't leak.

By: mermaid babe

quiet, efficient, no filters!

We use this in our apartment and it works great in both the large living room and bedroom. It's quiet and there are no filters to worry about. Very satisfied. This is the second winter using it. I don't think it mentions it in the description, but the night light changes colors...great for kids and cool adults :-) with this humidifier on, our hygrometer has no problem getting in to the comfort zone.

By: Laura L. (CO)

Perfect for overnight

I've owned numerous humidifiers over the years and always end up ditching them due to high-maintenance cleaning, mold, and causing me to develop a nagging cough. I've had none of these issues with the ultrasonic and in fact just bought a second one for my son's nursery.

The reservoir essentially only holds enough water to run while you're sleeping. This is perfect - just set it out to dry out during the day and fill it up again at night and you'll never have a mold issue.

There are four different settings for mist level and night light (which I find annoying but may be good for a child.) Mine sits right next to the bed. I would not advise this little machine for a large room - but it's perfect for smaller rooms, especially if you set it up near where you are sleeping.

The only negative: the second humidifier I purchased (same exact model) runs for more like 7 hours before it runs out of water. Not sure why this is happening. But for me the positives of this little machine outweigh the negatives.

By: JGrant

Works great!

Only lasts about 7 hours on high, but otherwise works as advertised. It's very small and quiet, which is exactly what I was looking for.

By: Nancy Johnson "Slim"

Good Humidifier

I purchased this humidifier for my daughter. We both love it. it works great and it even has a light. I must say it does not last for 10 hours.

By: Lisa M Hicks

Excellent Office Accessory

I use this in my office. Very satisfied with it this product and have recommended to others who complain of the dryness in the office.

By: Jean M. Davis

Smart Humidifier

The humidifier is sleek, attractive, and easy to fill. It does what it is supposed to do - raise the humidity in the room.

By: Kittylovescats

Best small one u can find

When I first received the humidifier, it did not work at all. I was going to send it back,but decided to give it another try. So, I refilled it and pushed the on button real hard, several times, and it started to work. So far it's been working for about three weeks. It also is VERY quiet.