Air-O-Swiss S450 Steam Humidifier

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AOS S450 Steam Humidifier
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Air-O-Swiss S450 Warm Mist Humidifier

True warm mist humidification is something that can soothe away flu symptoms as well as the itching, sore throat and dried sinuses that are often associated with eczema and dry air, respectively. Though enjoyed by many, boiler style humidifiers have had one problem - they boil water. This means that if you have pets or children, there's potential for an accident. Not anymore! Air-O-Swiss took this problem head on and created a humidifier that is not only a true warm mist humidifier but also safe. This powerful steam humidifier begins to operate by heating the water to the boiling point. The vaporized water from the unit then humidifies the room air, but the new ClearMist design of this system means the warm mist coming out is truly warm, and not burning hot. This system is the most hygienic way of air humidification, as heating the water to 212° F ensures a bacteria and mineral free process.

The addition of the AOS A451 Anti-Mineral Pads decreases the calcification in the vaporizer basin and reduces the frequency of decalcification making it easier to clean. These anti-mineral pads work by absorbing a large part of the resulting lime scale that can accumulate when boiling hard water. Easy to maintain and great for use with any type of water, the Air-O-Swiss S450 is a perfect fit for any home!

Air-O-Swiss S450 Warm Mist Humidifier Video

Air-O-Swiss S450 Humidifier Specifications

  • How The Air-O-Swiss Steam Humidifier WorksMain Voltage: 120 V / 60 Hz
  • Power Consumption: 160 - 480 W
  • Weight (empty): 10 lbs. (4.5 kg)
  • Size Dimensions (L x W x H): 14 x 9.5 x 13.2 inches
  • Capacity: approximately 1.85 gallons
  • Area Coverage: suitable for rooms up to 860 square feet
  • Humidity Output: up to 3.5 gallons a day
  • Operation Noise Level: Less than 35 dB(A)
  • Accessories: Anti-Mineral Pads A451

Air-O-Swiss S450 Product Features

  • No white dust - ever
  • Digital Touch Panel controls with adjustable hygrostat
  • Manual mode with 3 output levels
  • On and Off Timer (0-9 hrs.)
  • Automatic display dimmer with LCD digital display
  • Decalcification mode for easier cleaning of the water base
  • Removable water tank with handle for easier refills
  • Water level window
  • Empty and cleaning indicators
  • Anti-Mineral Pad to collect lime in the water base
  • Flat tank shape for easier water filling
  • Low center of gravity for stable placement on the floor
  • Sample packet of EZCal included with the humidifier
  • Quiet operation
  • Made in Korea
  • Three year warranty

Product Reviews and Questions

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  Dry skin and static-y hair
Reviewed by: Winter survivor from New York

Winter is here and I can't stand the dry indoors with the heater on. I had an ultrasonic humidifier but cleaning it was such a chore for someone like me who does not have the time and patience! This is the most low maintenance humidifier I've ever purchased! I'm serious. When I enter my room with this humidifier on, it's like being in the tropics I'm exaggerating of course but it really steams up my room.
  So easy to use
Reviewed by: No longer coughing from Ohio

Really like this unit over the other I have. I can use tap water and not get any white dust. It is much easier to haul out to refill. Love the fact that I can use it as a nebulizer somewhat also. The gurgling reminds me of the ocean at night so it doesn't bug me at all even in the bedroom. Seems a lot less temperamental than the 7142 Ultrasonic than we have.
  Great Product
Reviewed by:  from Kansas City

Before this unit I has another brand cool sonic mist that coated the house in dust and ruined fabrics like the comforter. Then I had a cool drip/evaporator, but it was always filled with slime/mold and was nearly impossible to hygienically clean. I now have 2 Air-O-Swiss S450 models, and post-6 weeks of full use, I haven't even needed to run the de-calcification process. I use Brita filtered tap water, and I do also use the mineral pads in my set up. Before refilling/replacing the water container, I pour out the residual water from the units basin to get the non-evaporated minerally residual water out, then re-insert the water container and turn on again. The boiler/steam kills all bacteria, the inside of the unit is spotless clean 6 weeks in, and my 3 year old holds her hand over the steam although I tell her not to, and while warm, won't cause any pain/burns/boo-boos. Yes, it costs more, yes it is unbelievably hygenic, no slime, and for me, needs no cleaning. Go for it!!!

Customer Q & A

Q1: I'm interested in the AOS s450 but was concerned with noise. Is this unit produce more noise than the ultra sonic AOS units?

A: Marginally. The ultrasonic don't produce much beyond a slight hum. With the S450 you get a similar sound with the addition of the occasional gurgle. The noise difference isn't noticeable for most people. Hope that helps!

Q2: Does this humidifier have a feature that allows you to use essential oils with it? I know some humidifiers have small oil trays or something similar. Thanks!

A: Yes, at the very top is a small container where you can use essential oils to mix with the steam as it leaves the humidifier.

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AOS S450 Steam Humidifier Reviews
Air-O-Swiss S450 Steam Humidifier

Soothing, compact and effective, the Air-O-Swiss S450 steam humidifier is a versatile home appliance ideally suited to combat the symptoms of dry winter air, eczema, and asthma. The winter months are often a very aggravating for people with asthma, eczema and any one dealing with a cold or flu. Maintaining proper humidity levels during these cooler, drier months, can not only help alleviate these symptoms but also have a secondary benefit for your home. With an array of humidifier choices out there, we tested the new AOS S450, and here's how this boiler-style unit fared.

What I like about the Air-O-Swiss S450 Humidifier

The fact that this model is a true warm mist humidifier is its biggest asset. Most ultrasonic humidifiers pre-warm the water which means by the time the mist leaves the unit, it is lukewarm at best. This steam is actually warm, and better still, the new ClearMist technology means you see the steam but won't get burned. Older models would release steam that if you kept your hand over the top, would burn in a matter of seconds. The S450 has hit the mark with steam that is truly warm and not lukewarm or scalding hot.

This feature also gives this model a big step up in terms of hygiene. There's no need for silver ion technology or anything else when boiling water effectively kills germs microbes and other organisms that can commonly be found in standing water.

With no ultrasonic diaphragm, most types of water will work well in this steam humidifier. Soft, hard or distilled water will all work, so using water straight from the tap shouldn't be an issue. Mineral pads absorb things like lime, calcium and other minerals commonly found in hard water. While these pads do NOT eliminate the need to remove occasional mineral scale or build up, they do greatly reduce the number of times you will need to do this. Intervals will vary and the Decalcification Mode actually makes cleaning it fairly easy. Just add EZCal and you're nearly done!

Aside from the hygienic features, this unit is an ideal humidifier for most applications in that the compact size and modern design of this unit fits most home uses. The small footprint makes it easy to use in nearly any room, regardless of space considerations, and the moisture output rivals that of many of the top of the line Air-O-Swiss models.

Lastly, the Air-O-Swiss S450 humidifier is equipped with a hygrostat and digital LCD screen. This measures the relative humidity and switches the appliance off automatically when the desired value is reached. The internal ventilation remains turned on, to ensure an accurate reading of the relative humidity. The other digital features remind you when to refill the machine and allow you to dim the display, set the mist output, and schedule the S450 to run on a timer.

What I do not like about the Air-O-Swiss S450 Humidifier

The only possible negative for this machine is that the operation is not silent. There is a little white noise when the unit is operating. For a light sleeper, this might be a problem. Other than this, when running full steam, the power consumption is higher than other humidifiers. It is in line with other steam humidifiers but higher than ultrasonic or evaporative models.

In all, the Air-O-Swiss S450 room humidifier is a powerful unit with uncompromising results. From moisture output and hygienic features to the modern finish and compact design, the AOS S450 is the best warm mist humidifier available. And, unlike pretenders, the S450 is a TRUE steam humidifier that will help you breathe better and keep your indoor environment more comfortable while relieving symptoms common during the colder fall and winter months.

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 S450 Humidifier User Manual     Air-O-Swiss S450 Humidifier User Manual
AOS S450 Quick Setup Guide     Air-O-Swiss S450 Warm Mist Humidifier Quick Setup Guide
Compare Air-O-Swiss Humidifiers
Compare Humidifiers
Humidifier Buying Guide
Humidifiers FAQ
Benefits of Home Humidification
Using a Humidifier


3 Year Limited Warranty


Discount AIROSWISS S450 Warm Mist Humidifier
AOS S450 Steam Humidifier (Item#: AO0022) (Out of Stock)

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