The HumidiHeat Heater/Humidifier keeps you cozy without drying out the air. Ideal for medium to large rooms up to 500 sq. ft., this sleek tower unit provides moist, warm air for wonderful comfort day or night. The HumidiHeat Heater/Humidifier allows you to operate the heater and humidifier functions separately or at the same time. This portable heater has 3 settings/heat levels from 900 watts to 1500 watts. The humidifier has a 2.2-gallon water tank for 24 hours of continuous use. And there's even a built-in air washer that gently freshens and filters the air automatically. With the HumidiHeat Heater/Humidifier, there are no filters or cartridges to buy. Note: When using the humdifier, be sure the tank is full. Turn off humidifier when using heat only. Safe for overnight use. For safety, we recommend never leaving an appliance running when away from home.