Yeah the HVAC guy said the pipes that run from water / stove over to gas furnace essentially allows you to heat home with wood as alternative. Gas was then 'backup' if heat from stove was not enough, but we have pulled that out, not planning on using at this point. Just too 'dirty' based on the soot you can see down there, I might be a bit insane to remove this option but also don't trust it much.
