As one of the few true steam humidifiers available, the AOS S450 stands heads and shoulders above the field. Not only does it actually heat the water to a full 212°, but thanks to the ClearMist technology, when the steam comes out of the humidifier it is warm, not scalding hot. So while it truly does offer the warmth and hygiene of boiling the water, it is safer than any comparable warm mist humidifier available.
In addition to the warm mist capability the S450 offers an array of digital controls and an LCD display. The built-in hygrostat lets you set your desired humidity level and quickly see current conditions in the room. This model is also one of the most versatile in that unlike other styles, it can safely use any type of water - hard, tap, softened or distilled water all work. Lastly, the Air-O-Swiss S450 has a longer warranty than most other brands, three years. All of these features combine to make this humidifier not only one of the most popular but Number 1 on this list of Top Five Warm Mist Humidifiers.
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