A friend and I made something very similar to that years ago to heat a spa pool on a trailer for the undi 500. It was pretty much like that except we had a second bottle mounted in the flu which had 20m of copper tube coiled up inside it, then on the door for the fire box there was a 100mm tube extended forward which had a 12v fan mounted to it. The water was cirulated with a Subaru intercooler pump. I might have to have a look at it again and make it into a bbq or smoker or something
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