80,000 BTU Convection Propane Space Heater with 360-Degree Heating RadiusThis propane convection heater is like a bonfire without the open flame. In barns, large warehouses, and garages up to 1800 sq. ft., youll feel the warmth, thanks to its efficient 360 heating radius. This versatile space heater runs for up to 36 hours on a full tank of propane and its electricity free (handy for emergencies). As youd expect from ProTemp, safety and convenience are built in. Pros choose ProTemp. California residents see Prop 65