Reflective radiant heat with the warmth of the sun. That is the Mr. Heater Radiant Propane Cabinet Heater in a nutshell. This Radiant 18,000 BTU Portable Propane Heater requires no electricity and is whisper quiet. With factory installed features like a tip-over safety switch and a thermoelectric safety valve with three heat settings of 6K, 12K, 18K BTUs, the only thing you need to make this heater the most useful tool you own 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 quiet warmth of the Mr. Heater Radiant Propane Cabinet Heater.Features6,000, 12,000, or 18,000 BTU per hourFor use with propane gasHeats up to 450 sq. ft.No electricity requiredQuiet and odorlessClean burningConstructed of rugged .08mm steel construction with heavy-duty lockable castersAutomatic low oxygen shut-off system (ODS)Tip-over switch safety shut-off