It will have a south facing roof at 6/12 or better. 12/12 is ideal in our latitude, but a little daunting to install.
The trick is to get good contact with the metal, and still protect whatever tubing used from being abraded. The metal roof expands and contracts every day, and moves slightly. I can hear our other roofs move from time to time.
One method had the tubing in a metal hat channel that the roofing sat on, so the roofing was not touching the tube directly.
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