Can pex be inserted inside leaking cast iron radiant heating pipe ?

6 Answers

  • elhigh
    Lv 7
    1 month ago

    You can do that but it won't fix anything.

    Just replace the pipe.

  • 1 month ago

    no.  you can't get either a seal on the ends or enough water flow through the pex piping

  • y
    Lv 7
    1 month ago

    It won't make it around any corners, depending on what you are thinking of replacing. It may not be rated for the heat load. Cast Iran can have build up inside so you may not even be able to get it all the way through.

  • Lv 7
    1 month ago

    sure, but for one thing, that isn't a supported layout.

    for another, that wouldn't stop the leak.

    for a third, it's simple enough to replace in whole.

    and for a fourth, even if it DID fix the leak, it would no longer work for radiant heating.

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  • Droopy
    Lv 5
    1 month ago

    for what reason?  Yes it could be.  But its not gonna transfer the heat efficiently.   I've know guys to use old iron pipes in houses as a chase.  To torun new supply pipes for bathroom ect.   But if its heating. I'd remove the damaged pipe an replace.  Ive done that on bunch houses.  

    It may be something easy you can do or might need a hvac guy.  might have to cut fit and thread some pipe.

  • Barry
    Lv 6
    1 month ago

    Why would you do that? If the cast iron pipe carries hot water it will block any heat flow. Cast iron can be welded easily if it's a crack. if it's a leaking joint remake it with Tru Blu pipe thread sealant. This stuff really works well.

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