Nathan Lewis : You are not the 1st fellow member of Permies dot com to think along the exact same lines you are following,
Please understand that a properly functioning
Rocket Mass Heater works only because of the Freaky high temperatures that it 'Fires' at ! - 1000 º F
Note that 212 º ƒ is the temperature at which Water Flashes to Steam !!! As such there is an inherent danger close to the Historical event of the
" Boston Marathon Bombing" - only with more fatalities, and more full thickness, full body burns !
Below is a link to one of the very few generally safe Rocket Mass Heater
RMH fired
hot water heaters !
https://permies.com/t/39243/rocket-stoves/Rocket-Mass-Heater-Workshop-emphasis
Please examine this working model, carefully read the comments that follow, and ask your questions at that
Thread !
For the Good of the Craft ! Big AL