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PEX for Base board hot water

JOE_99 Member Posts: 15
I want to use Pex with oxygen barrier in my BBHW system and some copper.What type of PEX should I use.I'm not sure yet if I will use 180 or 150 degree water.Can you use PEX at the higher temp.Have only seen Pex rated at 200 degrees.


  • Mitch_5
    Mitch_5 Member Posts: 102
    pex ratings

    are temperature and pressure related.

    We have been using pex for almost 15 years on heat and have only had two problems.

    One was a boiler that ran away (electrician wired it wrong) and the safety did not go off so the pex melted and acted as a pressure relief.

    The other is the change by one manufacture from metric to standard eliminating availability of fittings for a retro fit. Same can be said for incompatibility of some rare brands.

    Veiga pextron and fosta pex work great.

    Mitch S.

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  • hot_rod
    hot_rod Member Posts: 22,158
    Pex is commonly used

    for HWBB. I'd also suggest a PAP or the Viega FostaPex. Crunch the load numbers, often times 5/8" diameter is plenty to handle most zones. Much much easier to handle opposed to 3/4".

    hot rod
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
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