This is the lowest-maintenance, most germ-free humidifier available. Antimicrobial surfaces in the humidifier inhibit the growth of mold, fungi, and bacteria, and the Teflon coating on the dishwasher-safe heating element allows easy, quick cleaning of build-up and water residue. The unit has an output of two gallons of water per day and an automatic shut-off sensor that prevents overheating and saves energy. The adjustable humidistat lets the unit run for up to 40 hours on one filling, reducing refilling trips. 14 1/2" H x 12 1/2" W x 7 3/4" L. (9 lbs.)