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Re: Is this OK?
I just read this about Pex:
PEX piping meets all requirements for pressure and temperature performance in residential applications. Consensus standards published by the American Society for Testing and Materials (ASTM) International specify temperature and pressure-resistant capabilities of PEX pipe and all tubing used in residential applications bears the appropriate test marking.
In the event of a water heating system malfunction, PEX piping is designed to accommodate short-term conditions of 48 hours at 210ºF (99ºC) and 150 psi (1034 kPa) until repairs can be made. The most commonly used safety relief valve (T&P) activates (opens) at either of these temperature or pressure conditions. All PEX piping has been tested to withstand T&P activation for 30 days to ensure that safety requirements are met. As such, PEX systems DO NOT require the use of a special T&P valve.
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