I posted in the wood stove forum, but some of these also heat water ... and generate electricity. Top notch thinkers in this forum, and some of these may push the boundaries.
Innovative New Stoves -- a new and better mousetrap?
https://www.hearth.com/talk/threads/innovative-new-stoves-a-new-and-better-mousetrap.108406/
Innovative New Stoves -- a new and better mousetrap?
https://www.hearth.com/talk/threads/innovative-new-stoves-a-new-and-better-mousetrap.108406/
