In an emergency situation, it is possible to transfer heat from an outdoor fire to an indoor space using a thermo-siphon water coil or if you have the resources antifreeze coil, a coil of copper tubing hooked to automotive heater hose will bring a 55 gallon barrel of water to a boil in a short period. as long as there is a few feet of elevation from the bottom of the barrel and the bottom of the coil, the fluid will circulate. this may be a far better option for people than a wood stove install, the coil would be even better inside of a stove, and because the stove would be out of doors a simple home built stove would be fine. as said for emergency situations. the above system needs to be open to atmosphere to be safe, don't want steam pressure to build up
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