Tank top heater operates on 20-lb. or larger propane cylinder. CYLINDER NOT INCLUDED. Heats up to 565 sq.ft. Requires no electricity, wind resistant design, automatic control valve cuts off gas should heater go out. Features 6 different heat settings. Each burner swivels 180-degrees. Durable wire guard for safer operation. Used for construction sites, do-it-yourself projects, farm and auto repairs, hunting, camping or emergency uses. AGA Certified.