Expansion vessel performance

Discussion in 'Plumbing and Central Heating' started by RK_London, 22 Jan 2021.

  1. RK_London

    RK_London

    Joined:
    22 Dec 2020
    Messages:
    93
    Thanks Received:
    2
    Country:
    United Kingdom
    Hi...I need some help understanding an issue with my expansion vessel connected to my unvented cylinder. My understanding is the expansion vessel helps regulate the pressure in my unvented hot water system. Does the expansion vessel performance affect the central heating system?

    Reason I ask is my installer is suggesting fixing a known fault with the expansion vessel as a way of solving my problem of banging central heating pipes. Just don't know enough to understand. Would appreciate if someone can help me out with an explanation
     
  2. Sponsored Links
  3. cross thread

    cross thread

    Joined:
    8 Sep 2005
    Messages:
    1,696
    Thanks Received:
    307
    Location:
    worlds end
    Country:
    United Kingdom
    On a unvented cylinder it may have its own ex vessel that is just for hot water expansion only
     
    • Thanks Thanks x 1
  4. RK_London

    RK_London

    Joined:
    22 Dec 2020
    Messages:
    93
    Thanks Received:
    2
    Country:
    United Kingdom
    That was my understanding - so there is no connection between expansion vessel and central heating system?
     
  5. cross thread

    cross thread

    Joined:
    8 Sep 2005
    Messages:
    1,696
    Thanks Received:
    307
    Location:
    worlds end
    Country:
    United Kingdom
    Central heating may have its own ex vessel, heating ones are normally red ,and water white but not always
     
    • Thanks Thanks x 1
  6. RK_London

    RK_London

    Joined:
    22 Dec 2020
    Messages:
    93
    Thanks Received:
    2
    Country:
    United Kingdom
    Just have a white one - central heating has vaillant boiler - no vessel
     
  7. kidgreen61

    kidgreen61

    Joined:
    8 Mar 2009
    Messages:
    2,497
    Thanks Received:
    604
    Location:
    Staffordshire
    Country:
    United Kingdom
    Your boiler may be a system boiler which contains its own exp vessel, the two are in no way connected.
    The expv on your unvented cylinder is there to accommodate the expansion of the water in the cylinder as the water is heated, it should have no bearing on on HW performance.
    Other controls on the cylinder however may affect preformance.
     
    • Thanks Thanks x 1
  8. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
  9. Sponsored Links
Loading...

Share This Page