Avenger Portable Forced Air Propane Heater - 125,000 BTU, Model# FBDFA125V BTU Output: 55,000 - 125,000 with an approximate heating capacity of 3,000 sq ft Automatic safety shut off 120 volt/60 Hz outdoor & weather proof auxiliary outlet built into the power cord Dependable motor starts in cold weather Full load run time is approximately 39 hours on a 100 lb. propane cylinder