Air-O-Swiss U600 Ultrasonic Humidifier

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Air-O-Swiss U600 Humidifier


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Air-O-Swiss U600 Ultrasonic Humidifier

As a sister model to the U650, the Air-O-Swiss U600 humidifier is an ideal solution to soothing the conditions caused by cool, dry winter air. The sleek, new U600 ultrasonic humidifier uses a titanium coated diaphragm to emit ultrasonic frequencies that safely and effectively change the water and disperse it into the air in any room in your home. With a built in hygrostat you can easily set a humidity level and a separate dial allows you to regulate the mist output. Together you have complete control over how and how quickly moisture is put back into the air inside your home.

As both a warm mist and cool mist humidifier, the AOS U600 can either be set to preheat the water to 176° F before it is turned into mist or simply used a room temperature. The preheat function help to control microbe growth while working to keep the temperature of your room steady. Three separate indicator lights allow you to quickly tell if the unit is on, if you have it preheating the water for a warm mist or if the tank needs to be refilled.

Like other Air-O-Swiss humidifiers, the U600 is one of the safest and most hygienic humidifiers available. With the Hydro Stick, a preheat feature and a demineralization cartridge this ultrasonic humidifier removes impurities from the water before they can be dispersed into the air. For nearly any room in your home, the Air-O-Swiss U600 is a great way to combat dry air safely and effectively!

Air-O-Swiss U600 Humidifier Specifications

  • Main Voltage: 120 V / 60 Hz
  • Power Consumption: 40 W
  • Weight: 8.8 lbs (empty)
  • Size Dimensions: 9.5" x 11" x 14"
  • Area Coverage: suitable for rooms up to 650 sq. ft.
  • Humidity Output: up to 3.5 gallons a day
  • Tank Capacity: 1.46 Gal. (5.5 L)
  • Noise Level: < 25dBA
  • Accessories: Hydro Stick and Demineralization cartridge

Air-O-Swiss U600 Product Features

  • Dual, warm mist humidifier and cool mist humidifier
  • Hydro Stick, Ultrasonic Vibrations & Demineralization Cartridge work to capture minerals in the water before they are dispersed into the air
  • Hygrostat & Mist Output Regulator
  • Tank Empty Indicator
  • Auto Shut Off when water tank is empty
  • Sleek New Design
  • Easy to use Dial Controls
  • Large and transparent water tank (water level clearly visible)
  • Ultra Quiet Operation
  • Energy Efficient
  • 3 Year Warranty

Product Reviews and Questions

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Customer Q & A

Q1: Hi, what is the difference between Air-O-Swiss U600 and U650 humidifier ? Thanks

A: The only differences are the controls digital w/ display for the U650 and manual knobs for the U600 and the ITC intelligent temperature control. The 650 is nice since it will display the current relative humidity in the room and the soft touch controls are a neat feature. The ITC is basically an auto setting that will adjust output as the temperature may fluctuate in the room, to maintain a consistent relative humidity. Relative humidity is integrally linked to temperature, so when the temp s and the moisture level remains constant, the relative humidity actually increases. Colder air has a lower capacity to hold moisture, so if the water in the air remains constant but temperature s, the relative humidity, relative to the maximum amount of moisture that the air at that temp can hold, rises. Short answer, the controls and the ITC feature are the differences that also make the price different. Performance, look, dimensions, etc. are all essentially identical.

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Air O Swiss U600 Ultrasonic Reviews
Air-O-Swiss U600 Digital Humidifier

As the manual version of the U650, the Air-O-Swiss U600 humidifier is a quality home appliance for those who want relief from dry air in the home. With manual controls and fewer digital features, the AOS U600 is a compromise that delivers the same great humidification results for someone looking to stay under the $200 mark for a home humidifier. A full range of features make the U600 a hygienic humidifier while the results cannot be beat. When stacking this model up against the competition, this is what we found.

What I like about the Air-O-Swiss U600 Humidifier

For most of us, performance is job #1, 2 and 3, and with the Air-O-Swiss U600 you won't be disappointed. The tank holds just under a gallon and a half of water, and this is about in line (perhaps a little smaller) than comparable models. If your the room you are using the humidifier in is very dry, like mine is, you can push about 3.5 gallons of moisture back into the air over a 24 hour period. In my case, I was going through about 2 gallons of water a day, and the results were hard to argue with. Generally, in the downstairs area where my bedroom is, it gets extremely dry from October through January. For me this means trying to go to sleep breathing through my nose since when I wake up in the morning, I'll know in an instant if I was breathing through my mouth all night. The air is so dry that I often wake up with a sore throat and my sinuses feel like I've been trekking through the Mojave all night long. With this Air-O-Swiss humidifier there is a significant difference in the mornings. I don't wake up with a sore throat or dry sinuses, and the change is very welcomed! Over the course of a week, I also I use less lotion on my arms. Without a quality humidifier, dry winter air usually brings about dry skin on my arms, but after using the AOS U600, consistently, that nearly completely went away. So when it comes to actual performance, the U600 is a perfect fit in relieving these common symptoms.

Though it lacks the digital controls that come standard with the U650, the Air-O-Swiss 600 humidifier has to simple dial controls and some indicator lights. With the dials you can set the desired humidity level as well as the mist output. The hygrostat is fairly accurate and was only off by about 1.8% when compared to an independent hygrometer. The indicator lights let you know when the tank is empty as well as when you have the preheat function turned on. Filling the unit is simply and consists of removing the tank and filling from the bottom. Regular maintenance consists mainly of wiping down the unit, descaling with EZCal when necessary and replacing the demineralization cartridge regularly.

The demineralization cartridge basically acts as a water filter. It attaches to the inside of tank, and as water passes through, mineral impurities are filtered out. This helps to keep mineral content from being vaporized and dispersed throughout your home, and by being treated with silver ions, the housing of the cartridge naturally prevents microbe growth. The ultrasonic diaphragm is coated with titanium to increase longevity, and included is a small brush to use with EZCal in removing any mineral build up from the internal components. While some of this may sound very technical in nature, the actual maintenance is simply while the functionality is top notch.

As an ultrasonic humidifier, the Air O Swiss U600 using a rapidly vibrating diaphragm to create ultrasonic vibrations that turn normal water into a mist. This model also has an optional preheat function that will warm the water before turning it into mist. This works to inhibit the growth of microbes with actually boiling the water. And unlike humidifiers that boil water, ultrasonic technology is much safer and actually quieter. The AOS U600 is nearly silent and did not disturb my sleep at all.

The preheat feature is also what makes this a dual mist humidifier. When the preheat is active, the water is heated, then as it is dispersed it cools to a temperature of just over 100 degrees as it is released into the room. The slightly warmer temperature helps to keep the room temperature consist without the use of dangerous boiling system. In cool mist mode, the Air O Swiss U600 humidifier simply vaporizes the water at room temperature, but as with creating any mist, as it turns from a liquid to a vapor it cools. Cool mist or warm mist - it's all just a matter of personal preference.

What I do not like about the Air-O-Swiss U600 Humidifier

After testing the U650 and U600, I must admit, I missed having a digital readout of the current relative humidity. For most people though, this isn't a big problem since it's really all about being comfortable. After using the Air-O-Swiss U600 for a couple times, you'll get a very good idea of what settings are most comfortable for you.

I really wish someone would make a humidifier with a handle. Most come with handles built into the water tank, and this can be a bit deceiving if your are moving the humidifier from place to place. After going through this a couple times with other models, take care NOT to grab the handle and think you're picking up the whole unit. That... can be messy.

In all, the AOS U600 ultrasonic humidifier was an excellent value. The performance and features made it easy to use but efficient. The attractive design of this home appliance allows it to easily fit into nearly any room, and a 3 year warranty is one of the best around. The Air-O-Swiss brand has long provided consistent and durable home appliances with few drawbacks, and the U600 is no exception.

Why buy from Customer Testimonials
My son has always had a nagging cough when the weather gets colder, that persists all winter long. The Vornado Humidifier  seems to have helped him feel better, and I don't hear nearly as many late night coughing fits. Thanks!
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Humidifier Resources

Additional Resources

Air-O-Swiss U600 Humidifier User Manual     Air O Swiss U600 Humidifier Owners Manual
Compare Air-O-Swiss Humidifiers
Compare Humidifiers
Humidifier Buying Guide
Humidifiers FAQ
Benefits of Home Humidification
Using a Humidifier


3 Year Limited Warranty


AOS U600 Warm Mist Humidifier
Air-O-Swiss U600 Humidifier (Item#: AO0018) (Discontinued)

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