1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Central heating drain

Discussion in 'Plumbing and Central Heating' started by chewymix, 24 Sep 2019.

  1. chewymix

    chewymix

    Joined:
    21 Aug 2006
    Messages:
    111
    Thanks Received:
    1
    Location:
    London
    Country:
    United Kingdom
    Hi - I need to drain my central heating to replace the pump, it’s an open vented system, but as the gate valves are also corroded it’s a full system drain first.

    I do not have a drain valve that I can find but I do have a downstairs radiator, by a door, that has this - if I undid this bolt and attached a hose would this suffice to drain down the radiators?


    A58C5671-7207-48E6-8C63-0A2D945C7D33.jpeg

    and the reason to drain down is to replace this

    A521190B-06EB-4913-BD9E-E447B35C6360.jpeg

    Cheers
     
  2. Sponsored Links
  3. Mottie

    Mottie

    Joined:
    27 Feb 2017
    Messages:
    18,205
    Thanks Received:
    1,850
    Location:
    Essexshire
    Country:
    United Kingdom
    Yes but you'd have to be bloody quick!
     
  4. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    22,732
    Thanks Received:
    9,153
    Location:
    Lanarkshire
    Country:
    United Kingdom
    That crud on your pump is because there is a leak above it, its not the pump that is leaking post a pic showing the isolation valve above the pump
     
  5. chewymix

    chewymix

    Joined:
    21 Aug 2006
    Messages:
    111
    Thanks Received:
    1
    Location:
    London
    Country:
    United Kingdom
    Ok when I get home I will. The main reason I want to replace the pump is that I don’t think it’s working correctly or consistently moving enough water.

    sometimes the heating works perfectly and others some of the radiators take an age to get hot. No amount of bleeding or balancing helps and when the uneven heating happens the pump seems to be making more noise. It’s always the radiators in the loft that are effected and so I thought it was a circulation issue.

    It’s a 3 storey house with 12 radiators, I was thinking about a pump with a 6 meter head may help?
     
  6. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    22,732
    Thanks Received:
    9,153
    Location:
    Lanarkshire
    Country:
    United Kingdom
    But you have isolation valves above and below the pump, you close these to swap the pump over , no draining of anything required , but in your pic it looks like the one above the pump is leaking but cant see enough of it to be sure
     
  7. chewymix

    chewymix

    Joined:
    21 Aug 2006
    Messages:
    111
    Thanks Received:
    1
    Location:
    London
    Country:
    United Kingdom
    Yes, the gate valves are knackered and need replacing along with the pump. To replace the gate valves I need to drain the system yes?

    Will post a pic later
     
  8. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    22,732
    Thanks Received:
    9,153
    Location:
    Lanarkshire
    Country:
    United Kingdom
    no on an open vented system just use a bung kit and swap the valves then the pump , no need to drain it
     
  9. chewymix

    chewymix

    Joined:
    21 Aug 2006
    Messages:
    111
    Thanks Received:
    1
    Location:
    London
    Country:
    United Kingdom
    Can you elaborate on that please ?
     
  10. Sponsored Links
  11. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    22,732
    Thanks Received:
    9,153
    Location:
    Lanarkshire
    Country:
    United Kingdom
  12. chewymix

    chewymix

    Joined:
    21 Aug 2006
    Messages:
    111
    Thanks Received:
    1
    Location:
    London
    Country:
    United Kingdom
    Any clues where the vent may live?
     
  13. terryplumb

    terryplumb

    Joined:
    8 May 2017
    Messages:
    5,971
    Thanks Received:
    1,232
    Country:
    United Kingdom
    It lives above the F&E tank ,and points down into it .
     
  14. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    22,732
    Thanks Received:
    9,153
    Location:
    Lanarkshire
    Country:
    United Kingdom
    On second thoughts maybe time to get a pro in
     
    • Like Like x 1
  15. terryplumb

    terryplumb

    Joined:
    8 May 2017
    Messages:
    5,971
    Thanks Received:
    1,232
    Country:
    United Kingdom
    :LOL::LOL::LOL:
     
  16. chewymix

    chewymix

    Joined:
    21 Aug 2006
    Messages:
    111
    Thanks Received:
    1
    Location:
    London
    Country:
    United Kingdom
    I did wonder if the vent question would generate some Lolz but thanks for educating me.

    here are a couple of pics of the valves that also need replacing. As I said sometimes it gets noisy and others it just seems to lack efficient circulation hence me wanting to swap it out and see where I am at.

    A73B48E9-E0A7-4FC2-8109-423E0EB2E370.jpeg

    658935EE-7053-41B9-A7B6-F4E28210D5D0.jpeg
     
  17. kidgreen61

    kidgreen61

    Joined:
    8 Mar 2009
    Messages:
    2,345
    Thanks Received:
    537
    Location:
    Staffordshire
    Country:
    United Kingdom
    Classy installation:ROFLMAO:
     
    • Like Like x 1
Loading...

Share This Page