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I am trying to add a wood/coal boiler or furnace to my existing oil forced hot air furnace. I am trying to decide whether I should use a warm air furnace or a boiler with a heat exchanger in the plenum for my existing ductwork. I would like to heat hot water as well, and most furnaces or boilers seem to have a water coil available. My problems are twofold. Cost and the flue. I only have one flue (8") coming from my basement. The existing oil furnace uses a 6" flue. Can I connect the two? I want to use the oil furnace only when the coal/wood furnace is not operating, or to assist if the coal/wood cannot keep up with the demand. So the potential for them both running at the same time exists. Second, I am almost positive the answer to this next question is no, but are there any coal stokers that will accept wood? Lastly, the models I have been looking at are the Harman SF2500A (furnace) and the Harman SF 2600 (boiler). There are two problems with these models, I cannot order until spring and the prices $3k and up. I wanted to get something in before winter. Last year I was forced to use 2 unlined circa 1880's fireplaces in the old farmhouse because oil was over the top. Currently $4.29 a gallon for #2. Any and all help is appreciated. Thank you in advance.