I'm actually curious to find out how much heat/cold a 55 gallon drum will lose, I wonder how well they will work as a radiator with a big thermal mass. I have both plastic and coated steel closed head drums. I'll snake the 1/4" copper HX through the 2" bung hole.
I also have a 50 gallon insulated water heater tank to use when I start playing with pumps.
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