I currently have my ground loop transition to copper which runs to the heat pump and circ pumps. I want to reconfigure the piping a little and was wondering if PVC or CPVC would work ILO the copper. I am certain it can handle the heat my concern is the cold. I can't seem to find any info on how cold you can run water through it. Any one used a material other than copper?

thanks

Bill

All of my piping for my geothermal system is PVC pipe with the exception of the copper piping inside the Geothermal unit itself.