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Is PEX Safe for Hot Water Recirculation Systems?

Carl B.

Carl B.

New member
I’m designing a hot water recirculation loop for a second-floor bathroom that takes forever to get warm water.
I was thinking of using PEX-A for the loop, but someone told me continuous recirculation might degrade it.


Should I switch to copper for the return line? Or is high-temp PEX fine?
 
PEX-A can handle it, but two caveats:
  1. If your water heater is set above 140°F (not recommended), long-term PEX degradation is possible.
  2. Watch for chlorinated water — high chlorine + heat = bad combo for plastic piping.
    If this is a forever home and budget allows, copper's the safe bet. Otherwise, oxygen-barrier PEX with proper insulation should be fine.
 

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