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Posted: 12/15/2013 7:37:34 AM EST
[Last Edit: 12/15/2013 7:41:05 AM EST by fundummy]
Easily modified for more efficiency.

Thermal siphon good ideas -> http://www.youtube.com/watch?v=5IRLVCJ1olA#t=281

eta: let me know if the hotlink doesn't work correctly... k?
Link Posted: 12/15/2013 11:36:06 AM EST
I've thought about this myself. I heard Spirko answering a question about using a rocket mass heater to heat hot water. He warned against putting the coil inside the refractory chamber as it gets upwards of 3000 degrees*. Water hitting that high a temperature would flash into superheated steam. That would result in a catastrophic failure (explosion).
Having been in Navy, I've had experience with steam. I wouldn't build anything of the sort unless I was absolutely certain it couldn't generate steam in any way.
I think putting coil further downstream, after the refractory section, would be safe enough if you didn't run the stove too long.

* unsure of the exact temperature he quoted, but was high enough to superheat steam.
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