Well it's definitely putting out some good heat if its adding 40° to 50° to the incoming water during use. I tend to agree that the pump is probably putting some decent flow through the pipes, given the even inlet/outlet temps. Either way, it's an excellent retrofit for an old wood or coal stove. Definitely do-able on mine. I might have a go at it when I get some extra time and cash, just for experimentation purposes if nothing else.
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