PEX Pressure Rating
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PEX is generally rated at 80 PSI for 200F:
http://www.nibco.com/PEX/PEX-Tubing/PEX-Potable-Water/
Hydronic Heating
- This appears to say that if pressure is less than 80 PSI, then a pressure regulator is not necessary- https://www.nachi.org/forum/f22/max-pressure-cross-linked-polyethylene-73346/.