SKU 62091125-This Blue Flame 20,000 Liquid Propane Vent Free is the supplemental heating solution even on the coldest days. This is conveniently equipped with a thermostat for superior control of the temperature in your space. Also, with a battery powered electronic ignition, starting it is a breeze – battery included. This unit can be permanently mounted to the wall or securely fastened to the floor with included mounting brackets and fasteners. A clean burning blue flame tube burner uses the natural convection of the burn to circulate warm comfortable air. With a factory standard Oxygen Depletion Sensor (ODS), rest assured this will provide you with years of comfortable and safe heat.