Anyone know where these are available new? Note the reference to the old Mother Earth News Magazine article (free online) and the warning about providing a pressure relief valve.
Exchanger Wood Stove
(wood stove and oven with copper coil and salvaged water tank)
Tony’s Homemade Hot Water Heater
(not part of a wood stove but could be, separate tank with chimney up the middle, requires a fire underneath, best use where wood stove is not needed)
StillPE’s Wood Fired Water Heater
Gas Bottle Wood Stove Heat Exchanger
Note: As usual, if you find other good sources, please leave the website address in the Comment section.