Dad has a downdraft wood stove made by the amish. Its almost like the 82 hitzer, but im sure its different inside. He was burning good seasoned wood and burning the thing hot. Its been 2 months, So I told him to check his chimney and clean it. There was over 10 gallons of creasote in the chimney and he had to put the bare rod through just to break through, then brush it. He has a masonary chimney, thats 8x8 thats about 25 feet tall, 15 from ground level. This wood stove has been nothing but a pain. He currently has it in his basement and it heats his whole house through circulation. There is the 1500 square foot stove on clearance at home depot. Im pretty sure it has the secondary tubes. I was wondering if it would throw out the heat that the other did, being the amish one is maybe 50 percent efficient. I would like to see him get rid of the smoke bomb and get a cleaner burning, less wood heater.