Mr. Heater, MH38QFA, 38,000 BTU Forced Air Propane w/ Quiet Burner Technology, Heats approximately 800 sq ft., 38,000 BTU per hour, For use with propane gas, Runs up to 12 hrs on 20 lb tank, High temperature limit switch, Piezo ignition, QBT Technology - 50% Quieter than a standard propane heater, Plugs into a 110v outlet, Perfect for well ventilated construction sites, barns, warehouses and workshops.