Can I fit an expansion vessel anywhere on the circuit

Discussion in 'Plumbing and Central Heating' started by RobTi, 3 Nov 2021.

  1. RobTi

    RobTi

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    Hi my brothers combi boilers diaphragm has burst and its at the back of the boiler which is built into kitchen units so I said just size it up and fit on the heating circuit some where accessible, any reason why not .
    Thanks
     
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  3. Togo

    Togo

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    No reason why not, just fit it in the return side of the heating system.
     
  4. ianmcd

    ianmcd

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    How do you know it has burst, possibly just needs re-charged,
     
  5. RobTi

    RobTi

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    Water out the schrader valve
     
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  7. Madrab

    Madrab

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    Lots of water or just a little? An EV will always have a little moisture on the dry side.

    If fitting and EV, size it correctly and fit it as close to the return at the boiler as possible to minimise the amount of heat it's subjected to.
     
  8. RobTi

    RobTi

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    A lot of water I can just get in to test the valve not just a weep also definitely burst as it blows off at the prv when heating is on and water heats up and expands
    Thanks
     
  9. Madrab

    Madrab

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    The prv would still activate even if it just needed re-pressurised too, hence checking if the valve passes lots of water. If it does then it probably is burst and needs replaced .... don't forget to isolate and empty the internal vessel.
     
  10. ianmcd

    ianmcd

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    means nothing , re-pressurise properly, if EV is indeed burst you wont be able to pressurise it and you will hear the air bubbling into it, about 1 in 50 failed vessels actually need replaced , the rest just need charged properly , not just by trying to pump them up
     
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