I have a friend who owns a Brew Pub and Bread making restaurant. The flue pipe coming of the wood fired bread oven runs about 12' across to the all fuel chimney. He would like to capture the heat from the flue pipe to heat his hot water that they use in their kitchen (they run out of hot water at the end of the night). I have a lot of ideas of how we could rig something up but does anyone know of a manufactured part/ system that might work?