I'm getting ready to run the pipe for a future solar heater addition. The run is around 150-160ft each way from the pad to the roof. What size pipe would be best for that? I got a price for 2", but after measuring it, I wonder if bigger would be better. I don't even know if the local supply house has anything bigger than the 2" that I had them price. I'm planning to pick it up, and run it tomorrow, so what is the ideal size?
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