Aprilaire® 800 Steam Humidifier, 20.5 gal Nominal, Domestic

APR800 MFG #: 800
  • Control Type: Automatic, Automatic Digital
  • Country of Origin: US
  • Dimensions: 20-7/8 in H x 10-1/8 in W x 7-1/8 in D
  • Domestic/Import: Domestic
  • Electrical Ratings: 11.5 A, 120 VAC, 60 Hz, 11.5/16 A, 120 VAC
  • Manufacturer Name: Research Products
  • Material: Metal/Plastic
  • Nominal Capacity: 20.5 gal
The Aprilaire Model 800 Humidifier is a whole-home solution that helps you achieve total comfort through humidity control. As a steam model, the 865 complements non-forced air heating sources and other specialty heating systems. It is installed by a local HVAC professional.
  • Features and More


  • Accommodates crawl space, attics and area of the country with milder winters and non forced air heating
  • Runs independently of your HVAC system to accommodate larger homes (up to 6,200 square ft)
  • Delivers optimum levels of humidity control with the automatic digital humidifier control
  • Performs quietly and with simple maintenance and you only needs to replace the canister
  • Has a capacity of 11.5, 16.0, 20.5, 23.3, and 34.6 gallons per day, depending on electrical draw
  • Uses cold water, which may be hard, soft or softened


  • Attics
  • Crawl Spaces
  • Closets
  • Milder Winter Climates and Non-Forced Air Heating Source


  • Saddle Valves and Transformer


  • UL 998