…sent me this heat-actuated woodstove fan about five years ago. Still works great!
The original version of the heat-actuated fan comes from Canada and is quite expensive. Also quite good: D&L have a couple of them in their workshop and they’ve faithfully whirled away for well over ten years now. One might be excused for not automatically assuming the Chinese knockoff would behave as well, and I’m happy to be a testbed of that notion. In fact so far, every time it comes out of its box in November, it has worked flawlessly. Apparently the only way to wreck it is to violate clearly-printed instructions on the back, put it too close to the stovepipe collar, and fry the wiring.