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Thread: Should hot and cold pex pipes be separated? Or can they touch?

  1. #1
    DIY Member ironspider's Avatar
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    Default Should hot and cold pex pipes be separated? Or can they touch?

    Greetings all,

    I am installing some pex-a piping and I've got several lines to run through a room about 30'. My plan is to run these pipes through a PVC conduit just to keep them neatly contained and organized.

    My question though is whether pex pipe must be kept in a state where the hot and cold don't touch? Or is pex constructed such that if a hot pex pipe was touching a cold pex pipe they wouldn't affect each other enough to be noticeable in any way at the fixtures?

    The reason I ask is because I'd like to run ONE pvc conduit through this space and attach it ot the ceiling with some hangers instead of TWO conduits.

    But obviously this is out if the pipes touching each other will have a negative impact.

    Thanks in advance!

  2. #2
    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    If they are touching each other for the better part of the run you could get a heat transfer from the hot to the cold.

    John

  3. #3
    Previous member
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    Default

    By code they must be separated.

  4. #4
    Moderator & Master Plumber hj's Avatar
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    If you want "warm" cold water, and "tepid" hot water run them together so they can affect each other. Otherwise separate them.

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