One of the big name diesel truck makers; either Kenworth or Freightliner offers a 1 kilowatt thermocouple generator to fit onto the exhaust stack 4″ pipe. Essentially its a large block of inter connected thermo-couples wrapped around the exhaust pipe coming from the engine. Given a diesel exhaust is between 750F and at most 1200F this looks like it could be workable for a wood stove stack with temps held at around 1000F or so. It may take a bit to install but looks do able for a handy person.
If you are talking about using the heat in a wood stove stack only a thermo pile or a Stirling engine will workSteam engines also send a lot of wasted heat up th estack just like a wood stove. Steam engines are only about 24% efficient.
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