The Vornado UH100 Ultrasonic Humidifier gives you comfort you can see and feel. Powerful whole room circulation evenly distributes humidity throughout the whole room (up to 600 sq. ft. ) without pooling water on the floor. The built-in humidistat allows you to set your comfort level while the UH100 automatically maintains it. With the SimpleTank System we made carrying, filling and cleaning the tank, well, simple 1-gallon capacity and 2-gallon output every 24 hours. Easy-to-use push button controls, 3 fan settings (High, Low and Auto), simplistic design and the peace of mind of a 5-year satisfaction make the UH100 anything but ordinary.