Pro-Temp PT-125V-GFA Propane Forced Air Heater, Variable Output, 125,000 BTU 125000 btu heat output Heating Area Up to 3125 sq. ft Operates up to 22-hour on 100-pound propane tank Continuous electronic ignition Variable heat settings 125,000 BTU Heat Output Heats up to 3,100 square feet Operates up to 22 hours on 100 lb. propane tank Continuous Electronic Ignition Variable heat settings