We build our furnaces with only US steel with pride and we build them tough to last. We manufacture the only UL Listed Multi-Fuel furnaces on the market that vent out one chimney. We have the only UL and C-UL Listed solid fuel add on furnace on the market! For nearly 40 years we have been providing folks with quality products that not only save them money but put money back into their pockets! Our UL Listings and C-UL Listings plus the 30-year warranty are testimony to the time tested, money savings, and quality build of our furnaces.