So your stack, stove pipes, throw off a lot of heat that goes to waiste. Set a small fountain type pump in the bottom of your turkey fryer pot, attach a rubber hose to a copper pipe and extend it to 6" past the top of your stack. Then bend it around your stove pipe in a downward spiral back into your pot that is full of cold sap. Once the copper is in place wrap it with tin. Once your fire is drafting well turn the pump on. In a few minutes the sap will warm up