This portable radiant heater is like reflective radiant heat with the warmth of the sun. The 18,000 BTU portable liquid propane heater requires no electricity and is whisper quiet. With factory installed features like a tip-over safety switch and a thermoelectric safety valve, the only thing you need to heat up to 450 sq. ft. is a 20lb propane tank. Just hook the tank up to the hose and regulator, stow the tank in the cabinet behind the burner, then enjoy the comfortable quiet warmth.