Hello, I have a wood stove that I use as a pool heater, and basically works as a normal wood stove, but has tubing above where the fire burns that the water runs through to be heated. While this works pretty well and with a good fire burning I am able to get a temperature delta of around 8 degrees Fahrenheit, it could be a lot more efficient. Out of the top of the chimney, there is still tons of hot air that comes out, so there is so much more potential for that heat to be transferred to the water. I was trying to think of some ways to increase the absorption of heat, without adding more tubing or radiators. Would it at all work if I were to take, say half the volume of the exhaust from the fire and re-route it back into air inlet? This obviously would increase the amount of passes the heat has over the water, but would it totally just kill the efficiency of the fire, maybe even put it out? Obviously this wouldn't be the quickest way to heat the water as the fire would burn slower, so I would use such a method when I need to heat quickly. So would this work or no? Does anyone have any other ideas on how to increase my efficiency? Thanks!!