Mr. Heater MH38QFA Propane Forced Air Heater for Sale. Used but in good working condition. C/w owner’s manual. Below is info from the manufacture… Heavy-duty design built for the jobsite. The Mr. Heater Liquid Propane Forced Air Heater comes with a standard 10ft hose and regulator and all the safety you would expect of a Mr. Heater product. Equipped with factory installed high limit switches and thermoelectric safety valves, you can feel comfortable using these heaters on any jobsite. Just plug the heater into a 110v outlet, hook up the included hose and regulator to a 20lb propane tank or larger, and you are ready to take the chill out of any job. • 38,000 BTU per hour • For use with propane gas • Heats approximately 800 sq ft • Runs up to 12 hrs on 20 lb tank • High temperature limit switch • QBT Technology - 50% Quieter than a standard propane heater