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I would like to build a simple wood fired boiler. Burning wood is most efficient if it is burned hot and fast and that can make too much heat. I would like to store the excess heat in an insulated water tank for later use. I would prefer to keep the system as simple as possible. I was wondering if a gravity (what I had always heard called a thermo siphon) system would work for moving the water from the boiler to the tank. The tank could be right next to the boiler. Apart from the question of is this possible, I wonder about how to plumb this. Should the tank be above the boiler? Should the pipes from boiler to tank be the same size? Should the pipes from boiler to tank be inclined up or down? How do you determine the diameter of the pipes? Electricity in my neck of the woods has not always been reliable. With a circulator and a roaring fire if the electricity were to go out it could be a problem.
Thanks for any insight any one can provide.