This Mr. Heater Liquid Propane Convection Heater packs a big punch in a small package. It utilizes the natural act of warm air rising to quickly heat up to 625 sq. ft. Equipped with a thermo-electric safety valve to shut the gas flow off if the flame ever goes out. Just hook up the supplied 10ft. propane hose and regulator assembly to a 20-lb. propane tank, and easily light the heater with the factory-installed Piezo igniter to enjoy the comforts of up to 17 hours of warmth tailgating or on the jobsite.