I saw something on the internet a couple years ago called hydro-coil. It was a heat exchanger you put into the firebox of a wood stove. I could not use it because my woodstove is too small.
I just did a search again for it and came up empty.
My neighbor was talking with a pellet stove maker and they claim to be coming out with a line of pellet stoves with a built in water heat exchanger. Sorry, don't remember the brand.
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