PEX Pressure Rating

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PEX is generally rated at 80 PSI for 200F:

Hydronic Heating Applications

  • This appears to say that if pressure is less than 80 PSI, then a pressure regulator is not necessary-
  • PEX appears to be compatible with standard P&T relief valves - [1]. But this does not say whether the P&T valve can be connected directly to the PEX, or only upstream of it, prior to the PEX transition.
  • This says not to use PEX for P&T valves as there is a chance the P&T valve will fail - [2]