Mr. Heater, MH60QFAV, 60,000 BTU Forced Air Propane with Quiet Burner Technology, Heats up to 1,500 sq ft., Forced air propane heater with quiet burner technology, making it 50% quieter, High and low settings: 60,000-30,000 BTUs, High temperature safety shut-off switch, Thermo-electric safety valve, Approximate 12 hours of run time on a 20 lb propane tank, Continuous spark ignition, requiring a 115 Volt AC outlet, Perfect for well ventilated construction sites, barns, warehouses and workshops.