The Vornado Mistic™ 6 Ultrasonic Humidifier gives you the comfort of warm or cool mist with the convenience of a true top-fill design that allows you to fill the tank without opening the lid. Powerful whole room humidification evenly distributes up to 3 gallons of humidity per day throughout the whole room (up to 700 sq. ft.), and with the included scent pads you can enjoy aromatherapy with your favorite essential oils. The built-in humidistat allows you to set your comfort level while the Mistic ™ 6 automatically maintains it. With the SimpleTank ® System we made carrying, filling and cleaning the 6-liter tank, well, simple.