Provides plenty of heat even during power outages — requires no electricity. Thermostat is included for comfort control. For indoor use. Recommended for buildings with 19ft. to 22ft. ceilings. AGA design certified. U.S.A. Heating Application: Indoor, BTU Output: 100,000, Vent-Free: No, Heating Capability (sq. ft.): N/A Radiant heat, Fuel Type: Propane, Fuel Consumption (gal./hr.): N/A Thermastatically/Millivolt controlled, Igniter: Electronic, Thermostat Included: Yes, Dimensions L x W x H (in.): 60.5 x 21.5 x 11 100,000 BTU/HR Efficient Infrared Heat - Directly heats people and objects which in turn heats surrounding air to desired temperature Economical - No electricity required. Heats during power outages Convenient - Easy to operate and install. All necessary brackets and hardware included. Quiet, Clean, Odor-free Operation - Propane Instant Heat - Includes adjustable thermostat for individually controlled warmth. CSA Certified