400,000 BTU Forced Air Propane HeaterThis Mr. Heater 25,0000 40,0000 BTU Propane Forced Air Heater is designed for heavy duty use on the jobsite and comes with all the necessary safety features. It features a factory installed high limit switch and continuous solid state ignition, making it suitable for use on any job. Simply plug it into a 110 Volt outlet, connect the included hose and regulator to a 100 lb. propane tank or larger, and you'll be ready to heat up to 9,000 sq. ft. for up