The Aprilaire Model 800 Residential Steam Humidifier features truly automatic control, so there's no need to manually control the humidifier - though it can be installed in manual mode, if desired.

Complementing none-forced air heating sources and other specialty heating systems:

• Has a capacity of 11.5, 20.5 or 23.3 gallons per day depending on electrical draw. 
• Humidifies tightly-constructed homes up to 6,200 ft2