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 make the UH100 anything but ordinary.