Master MH-375T-GFA 375000 BTU Propane Forced Air Heater with Thermostat 375000 btu heat output Heats up to 9300-square feet Operates up to 11-1/2-hour on 2 100-pound propane tanks Continuous electronic ignition Built-in thermostat 375,000 BTU Heat Output Heats up to 9,300 square feet Operates up to 11.5 hours on (2) 100 lb. propane tanks Continuous Electronic Ignition Built-in thermostat