<< You should not use copper. I thought about doing
something very similar but using the vinyl tubing the
whole way. I know the vinyl tubing is not real good at
heat/cold transfer but it should still work. >>
I use vinyl drip irrigation tubing to heat water from the tap by placing a 50
foot coil in a heated 55 gallon drum of water for my water change system. It
raises the temperature in winter from 50 to 60 degrees.
Lee Harper
Media, PA
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