With a system input of 60,000 BTU, The Style Crest-Revolv MG2R-B060F1AAM1 furnace can generally heat small to medium mobile homes in ideal applications. With a high efficiency rating of 95% AFUE, this input equates to an output of 57,000 BTU, and 95% of the fuel going into the unit is contributed to heating your home and only 5% of the fuel is lost out of the flue venting and is used up in normal furnace operations.