The GoodmanGMSS961205DN is a convertible, multi position and multi speed gas furnace that features long lasting silicon nitride hot surface ignition system and a steel tubular heat exchanger. You can use either use it on propane or natural gas as the source can be easily converted with the propane conversion kit. The motor of Goodman 1115,000 BTU 95% gas furnace is four speed and ensures quiet operation while it is operational. Further, you can have a reduction in your energy bills as the gas furnace is energy efficient. It comes with the capacity of 115000 BTU with a maximum heating output of 110500 BTU.