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Could be used as idea for boiling down sap- with taps lines running right into the tub! Rocket stove bathtub thewaldeneffect.org

pic - find MUCH more info if interested in heating water- can be dangerous b/c of pressure from water expansion....

Dragon Heaters use rocket heater technology to efficiently heat using 70 % less wood than conventional heating. Dragon Heaters can be used in.. Houses Barns Green Houses Patios www.dragonheaters.com

Rocket Stove Mass Heater. "heat your home with 80% to 90% less wood; exhaust is nearly pure steam and CO2 (a little smoke at the beginning); the heat from one fire can last for days; you can build one in a day and half; folks have built them spending less than $20"

stove pipe water heater By running the lines from that coil to an old water heater, it sets up a thermo-siphoning loop... for bending but ice works better. filling the entire copper coil with a hose, and putting it in the freezer