I saw these on the web .They claim to burn any kind of burnable but coal[ WOOD, CORN AND PELLETS] . Has any one heard of these or know any one who has one? I'm just interested to hear how well they work. In the companies description it says you will need to have a fan behind the heat exchange tubes and install a direct out side power air vent. They are not expensive , and if they will work with out a chimney they sound like a good deal.