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Attic Central Heating Expansion Tank Overflowing

Discussion in 'Plumbing and Central Heating' started by jameslm85, 23 Apr 2013.

  1. HERTS P&D

    HERTS P&D

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    Was the water warm?

    Andy
     
  2. jameslm85

    jameslm85

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    No stone cold.
     
  3. HERTS P&D

    HERTS P&D

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    Ok, see what happens.

    Andy
     
  4. jameslm85

    jameslm85

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    Is the existing valve a part 2? Looking online, I guess the existing orange float just gets screwed on the end of the new valve.

    With regards to the overflow pipe being too high, certainly agree. But how would I fix this unless I replace the whole cistern?
     
  5. PlumbGas

    PlumbGas

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    don't use the old ball, they cost very little so fit a new one, make sure you can isolate the water before attempting anything, you can move the overflow down by drilling a new hole and adjusting the pipework, a pro plumber would then blank the old hole, some will say you don't need to do that as the water will not get that high as it will leave via the overflow
     
  6. jameslm85

    jameslm85

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    The water I removed from the tank seemed to top itself up again and the overflow started dripping again. As reccomended to me I will change the part 2 float valve. I guess this is something I can get from a chain DIY store?

    Do I just turn off the water to the tank, drain enough water out of it so it doesn't pour out when I remove the old valve and then unscrew the old valve/rescrew in the new valve?
     
  7. PlumbGas

    PlumbGas

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    Thats about the size of it yes, screwfix, any plumbers merchants or B&Q,
     
  8. HERTS P&D

    HERTS P&D

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    • Thanks Thanks x 1
  9. jameslm85

    jameslm85

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    Thanks for advice so far.

    So I got my float valve replaced by a plumber (wasn't completely sure myself so safer to get some help).

    After a few days of no drips, the overflow pipe has now started dripping again, with the tank back up to the level shown in the picture I uploaded.

    I guess that means the old float valve probably wasn't the cause and it's something else.

    As I'm not using the central heating system at all, I doubt it is dripping water into the tank. Perhaps it is the emersion cylinder in the airing cupboard. I turn it on for an hour each day, to provide me with hot water. I have read some threads about cracks in the coil causing water to expand up into the loft tank.

    What would be a next step?
     
  10. RigidRaider

    RigidRaider

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    The immersion heater is an electric element, a bit like in a kettle but long. The coil is for the boiler.
     
  11. kidgreen61

    kidgreen61

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    Is the level of the water in your big tank higher than the small tank?

    If so, it's highly likely the coil is split in your HW cylinder, and flowing from one (higher) tank to the other.

    Could be new cylinder time :cry:
     
  12. HERTS P&D

    HERTS P&D

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    Yep..........new cylinder needed!


    Andy
     
  13. jameslm85

    jameslm85

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    Both tanks sit level on the same boarding, but as the cold water tank is much bigger, the water is higher in the cold water tank.
     
  14. kidgreen61

    kidgreen61

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    Then you've answered your own question.

    Time for a new cylinder I'm afraid.
     
  15. jameslm85

    jameslm85

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    Is that expensive?
     
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