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

Water tank in attic overflowing intermittently

Discussion in 'Plumbing and Central Heating' started by mmolyneux, 12 Mar 2020.

  1. mmolyneux

    mmolyneux

    Joined:
    23 May 2008
    Messages:
    7
    Thanks Received:
    0
    Location:
    Leicestershire
    Country:
    United Kingdom
    Hi. I've noticed that the overflow seems to be leaking, but I think it's only happening at night/early morning. Sometimes I go outside first thing (around 7am) and see it dripping. I swear that if I run the hot water for a bit then the dripping stops. Need to test this further, but the floor only seems to be wet in the morning and not seen it drip in the day or evening (however I'm out at work during the day!). Does this make any sense to anyone why this might be happening? Thanks
     
  2. stem

    stem

    Joined:
    20 Jul 2005
    Messages:
    6,000
    Thanks Received:
    1,303
    Location:
    Nottinghamshire
    Country:
    United Kingdom
    Most common fault with a hot water system feed tank.

    The float valve probably isn't shutting off completely and so slowly fills the tank. During the day as water is used it doesn't reach the top and overflow, but after longer periods when water isn't being used it slowly fills up and so overflows. Using some hot water will cause the water level to drop and the overflow stops dripping.

    A quick inspection of the tank will reveal if the valve is dripping and a new washer is usually all that is required.

    They come in various sizes. But the good news is that they are cheap, and only take a few minutes to change.
     
    Last edited: 12 Mar 2020
  3. denso13

    denso13

    Joined:
    22 Jan 2007
    Messages:
    3,065
    Thanks Received:
    655
    Country:
    United Kingdom

    As above. Water pressure can increase a bit at night as well as very little is being used by most people.
     
    • Like Like x 1
  4. mmolyneux

    mmolyneux

    Joined:
    23 May 2008
    Messages:
    7
    Thanks Received:
    0
    Location:
    Leicestershire
    Country:
    United Kingdom
    Awesome thanks guys, much appreciated - I'll take a look. So this will be a constant dripping into the tank? Where would the washer be?? On the ball value itself?
     
  5. stem

    stem

    Joined:
    20 Jul 2005
    Messages:
    6,000
    Thanks Received:
    1,303
    Location:
    Nottinghamshire
    Country:
    United Kingdom
    It's not a ball valve, it's a float valve, but that's my fault because that's what I originally called it. (I'm working on a project with some ball valves presently and got confused :whistle:)

    How to get at it depends on the type, here are a couple of examples. There is a cap, or cover that needs to be removed to access it.

    1.jpg

    2.jpg

    With the lower example, the split pin that provides the pivot point for the arm will need to be removed also.
     
  6. bernardgreen

    bernardgreen

    Joined:
    3 Nov 2006
    Messages:
    22,709
    Thanks Received:
    2,138
    Location:
    Bedfordshire
    Country:
    United Kingdom
    Obviously turn off the water supply to the tank before dismantling the ball cock.

    ( I do know some one who didn't turn the water off. The new ceiling was expensive )
     
  7. mmolyneux

    mmolyneux

    Joined:
    23 May 2008
    Messages:
    7
    Thanks Received:
    0
    Location:
    Leicestershire
    Country:
    United Kingdom
    Thanks again. Will have a gander!
     
  8. Sponsored Links
Loading...

Share This Page