U.S. Stove fireplaces, warm air furnaces, heaters and stoves products are for residential use only, and are sold online and through retail stores. To be sure you are buying a union-made item, look for the Union Label. U.S. Stove products manufactured in Bridgeport, Alabama are union-made and carry the the union label. For a list of retailers, go to:http://www.usstove.com/Dealers.htm Types of stoves: corn/pellet, wood/coal, and free standing. Types of heaters: direct vent and vent free. Key searching words: blower, cold air return, coil, fire brick, grate, hot water, limit control, and thermo-disc.