no hot water

Discussion in 'Plumbers' Talk' started by Nick1234, Aug 14, 2019.

  1. Nick1234

    Nick1234 New Member

    Help. I've changed a hot water tap and now I don't have any hot water. I've tried putting the cold feed into the hot feed but all that happened was the overflow pipe from the attic started leaking. Any help would be appreciated.
     
  2. xednim

    xednim Active Member

    you have gravity fed hot water and pressure fed cold one, your new tap is not suitable for unbalanced feed
     
  3. Nick1234

    Nick1234 New Member

    But it happened before I put the new tap on. Ive no hot water downstairs either
     
  4. Nick1234

    Nick1234 New Member

    I mean I put isolation valves on then turned the water back on. but no hot water. I've got cold water.
     
  5. xednim

    xednim Active Member

    air lock
     
    Astramax likes this.
  6. Astramax

    Astramax Well-Known Member

    As above without any doubt.
     
  7. Nick1234

    Nick1234 New Member

    yes, I thought so. So I put the mains feed into the hot water to blow it out but it hasn't worked. Any ideas
     
  8. terrymac

    terrymac Well-Known Member

    How did you isolate the hot water ,prior to fitting isolation valves ?
     
  9. Nick1234

    Nick1234 New Member

    stop cock buy the water tank
     
  10. terrymac

    terrymac Well-Known Member

    Do you mean stopcock to the loft tank ,or stopcock on the feed from the loft tank to the hot water cylinder ? If the latter ,is it a gate valve ( big red handle ) ?
     
  11. Nick1234

    Nick1234 New Member

    it was the latter
     
  12. terrymac

    terrymac Well-Known Member

    If it is a gate valve ,its stuck in the closed position internally.
     
  13. Nick1234

    Nick1234 New Member

    its only 6 months old. is there a way to sort that out myself
     
  14. xednim

    xednim Active Member

    if airlock you can try to block overflow and next push with the mains
     
  15. terrymac

    terrymac Well-Known Member

    Yes replace it with a lever operated, full bore valve. Gate valves are junk. If you overtightened ,when closing it ,the internal brass spindle snaps and the gate remains closed. Did you fit the gate valve ,if so replacing is the same procedure.
     
  16. Nick1234

    Nick1234 New Member

    Its got a round red handle on it. and no i didnt fit it
     
  17. terrymac

    terrymac Well-Known Member

    What a ridiculous suggestion. If the overflow is blocked then excess water could flood the loft .
     
  18. Nick1234

    Nick1234 New Member

    Thats what i thought
     
  19. xednim

    xednim Active Member

    hold on- I got that wrong- was thinking about expansion pipe- sorry for previous post
     
  20. terrymac

    terrymac Well-Known Member

    Definitely a gate valve. You will need to isolate the cold water supply to the loft tank ,and drain the loft tank. Either by siphoning with a hose pipe ,or bucket and sponge job. Is your cold water to bath from the loft tank ? If so run it and that will empty most ,but not all the loft tanks water.
    When you undo the gate valve ,be prepared ,with plenty of towels ,as quite a bit of water will still be in the pipe. Your hot water cylinder should have a drain cock ,low down near the bottom of it ,where the cold feed goes in. That can be used to lower the level of water in the cylinder ,but be aware the rubber seal in the drain cock can be stuck in position and makes the job more complicated if it is ,so I advise you to leave it alone.
    Is the gate valve higher on the pipework than the cylinders distribution pipe ( hot water outlet)? The higher it is ,the less water will run out when the gate valve is loosened.
    There are other ways to tackle the job ,like fitting a bung to the loft tanks outlets and expansion pipe,or freezing the pipes either side of the gate valve before removing it. Draining all the water out is your safest way.
     
    WillyEckerslike likes this.

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