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Leaking header tank

Discussion in 'Plumbing and Central Heating' started by AlvoSlim, 19 Sep 2018.

  1. AlvoSlim

    AlvoSlim

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    Afternoon all,

    The cold water tank in the loft (approximately year 2000, plastic) must be leaking. I can see a few inlets/outlets, none of which have any water around them. The water seems to be coming from underneath, as though the tank has a crack or puncture. No idea how after being in place 18 years. Just age?

    I've turned the cold supply off, and drained the tank.

    I'm going to look for a leak now, but what to do if I find it?? Or if I don't?

    Any tips anyone?
     
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  3. JohnD

    JohnD

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    What is it supported on? Post some photis
     
  4. AlvoSlim

    AlvoSlim

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    Wooden arrangement of ply and 3x2. Going up now. Update in 10 mins.
     
  5. JohnD

    JohnD

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    is the water from your hot-water cylinder sometimes surprisingly hot?
     
  6. AlvoSlim

    AlvoSlim

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    OK, so it's 4x2 and tongued and grooved, not ply...but yeah...

    Drained the tank down to the last inch but there's nothing obvious. Probably wherever the split is was caused by a metal re-inforcing bar being out of place down one side, causing the whole side to bow out.

    I'm thinking new tank then. Any tips?
     
  7. AlvoSlim

    AlvoSlim

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    Not that I've noticed John. Why?
     
  8. bernardgreen

    bernardgreen

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    Could it be condensation forming on the cold sides of the tank.. ?
     
  9. AlvoSlim

    AlvoSlim

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    Attempting photo's...
     

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  11. AlvoSlim

    AlvoSlim

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    Tank sides are dry as a bone. I've taken the lagging off and there's not a drop on either the tank walls or the plastic lagging coating.

    Plus, to be fair, we only know about it because it's stained the ceiling below. That's a lot of condensation!
     
    Last edited: 19 Sep 2018
  12. Nige F

    Nige F

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    Woodworm - seriously - I've seen one like it;)
     
  13. AlvoSlim

    AlvoSlim

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    On closer inspection, where the metal re-enforcement bar wasn't fitted properly and the tank bowed out, it looks like there's a tiny split in the plastic. On the pic above there's a limescale stain where I assume the leak was.

    I've got to DIY it because my missus is off long term sick and we're skint...any way to bodge this? The split looks like it's about a foot below the water line.

    If not I can find a 50 gallon tank from screwfix for £150. Any advice on better/cheaper? Any good 'how to' guides?
     
  14. HERTS P&D

    HERTS P&D

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    You could always lower the float valve to below the crack (temporary repair) until you get a new one fitted.

    Andy
     
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  15. HERTS P&D

    HERTS P&D

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    Also, how big is the split?

    Andy
     
  16. AlvoSlim

    AlvoSlim

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    I'm filling it now back to just below the assumed split....it's not visible inside, but outside on a corner it feels like the plastic has split. It's no more than a pin prick, but it could have been there for months. The wood under the tank is saturated but feels solid. Should dry out.

    I'm going to only half-fill the tank. If it doesn't leak after that, I'll fill it an inch above where I think the crack is and see what happens...
     
  17. HERTS P&D

    HERTS P&D

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    Post a picture of it.

    Andy
     
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