I ran across this video on youtube and never heard of the idea that you can power a engine from the exhaust of a wood stove. The guy in this video does a good job of explaining how it works. The wood burning part is inverted, he removes the heat from the smoke and what comes out the "chimney" is a clear burning gas (vapor?) that he feeds to a generator. He runs a skill saw off the generator powered by a wood stove.
https://youtu.be/a6e3CprVTi8
So what's going on here? LOL what kind of magic is this. I grew up in a house that had a woodstove in the basement and the chimney never blew up