Mr. Heater, MH25CVX, 25,000 BTU Convection Heater, 15,000 - 25,000 BTU per hour, Heats up to 625 sq ft for up to 17 hours on a 20 lb propane tank, For use outdoors or in well-ventilated areas; piezo ignition start, No electricity required,10ft propane hose and regulator assembly included, Perfect for well ventilated construction sites, barns, warehouses and workshops.