Provides plenty of heat even during power outages — requires no electricity. Thermostat is included for comfort control. For indoor use within the following clearance to combustibles measurements: 34in. from ceiling, 30in. from sides of heater, 30in. from back and 68in. from the base. Recommended for buildings with 12ft. to 15ft. ceilings. AGA design certified. U.S.A. Heating Application: Construction, Garage, Vent-Free: No, BTU Output: 40,000, Heating Capability (sq. ft.): 750, Blower Included: No, Fuel Type: Natural gas, Thermostat Included: Yes, Remote Included: No 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 Instant Heat - Includes adjustable thermostat for individually controlled warmth. CSA Certified