The Mr. Heater Big Buddy Propane Heater combines radiant heat and convection heat to efficiently warm up to 400 sq. ft. The heater features a 4-position heat control with built-in Piezo ignition and a swivel-out cylinder mount for easy propane cylinder installation. The tip-over switch and low-oxygen shutoff system provide safety. CSA certified for indoor use. Mr. Heater Big Buddy Propane Heater - Camping Appliances at Academy Sports