Mr. Heater MHVFBF20LPT 20,000 BTU Blue Flame Vent Free Propane Heater For Cold Rooms, Additions, Sun Rooms Cabins Garage – White POWERFUL PROPANE WALL HEATER: Provides up to 20,000 BTUs of heat, effectively warming rooms and cabins up to 700 sq. ft. designed for reliable performance even at elevations up to 4,500 ft. for consistent warmth in cold conditions EASY CONTROL IGNITION: This blue flame heater features a thermostat for accurate temperature control and a hassle-free startup with its battery-powered electronic ignition battery included consumes fuel at a rate of .926 lbs per hour SAFE HEAT: One of the most important features of this propane indoor heater is the factory standard automatic low oxygen shut-off system Oxygen Depletion Sensor-ODS that ensures safe operation whenever in use CONVECTION HEAT: This ventless propane heater features a blue flame burner that uses convection heating, which heats the air, not objects, and disperses that heated air through the area, warming the room from top down, similar to a fireplace VERSATILE MOUNTING: Other wall heaters for indoor use are required to be fixed to a wall where ours is designed for mounted or free-standing use, with legs mounting hardware included for simple installation to meet the needs of your space