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

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

All About Rocket Mass Heaters! These are super-efficient wood burning heaters that you can make using common materials. They use far less wood than any woodstove out there. Shown, rocket mass heater super duper vortex of smoke reburn combustion awesomeness!

"Rocket mass heaters. Less wood, exhaust is just steam and CO2, heat from one fire lasts for days, you can build one in a day and half, and people have built them for under 20 bucks."

Cast iron wood splitter. Definitely need one on the bus to fire up our wood stove on cold nights.