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Discuss Leaking hot water pipe in concrete. Replacement advice needed! in the Plumbing Forum area at UKPlumbersForums.co.uk.

  1. malx42

    malx42 New Member

    Has anyone come across anything similar. Sorry there are so many questions. Many thanks in anticipation.

    My daughter has moved, 5 weeks ago. The previous owners had a hive system on the Worcester-Bosch combi boiler. They replaced it with a hive thermostat and my daughter eventually got it talking to the boiler. She had hot water but no central heating. The boiler kept cycling. Plumber 1 came and couldn’t figure our what was happening. Worcester-Bosch engineer came and diagnosed leak in hot water system. Estimated as 2 litres a minute . 20 cubic metres in 3 weeks, somewhere unnoticed, and then there was 200 cubic metres of gas that had been used.

    The Boiler gave priority to hot water, so with this leak the heating couldn’t turn on the diverter valve. Engineer showed how to close hot water outlet on the boiler . so now CH works.

    I have had a look at the pipework. A mix of copper and plastic. I have located the area where I think the pipe is leaking. It’s very wet, soaking the walls. How could a pipe be leaking so much when buried in concrete? Where is the water going? Do I dig up the concrete and repair the pipe, Or put a Long new run in to bypass it? Use plastic rather than copper? I have never done water pipe plumbing. I don’t like the ugly elbows.

    It seems that the mains water supply is also buried in the same location. Is this likely to corrode as well?
     
  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    youve confirmed theres a water leak by checking with the water meter ?
     
    • Agree Agree x 1
  3. king of pipes

    king of pipes Trusted Plumber GSR Top Contributor!!

    Get a engineer to sort it is my advice abandon the leaking pipework and get it rerouted above ground , hire a dehumidifier and dry out the walls and floor. Cheers kop
     
    • Agree Agree x 1
  4. malx42

    malx42 New Member

    There is no water meter. With all the taps off, and opening the hot water outlet valve on the boiler, it will fire up, and you can feel the hot water moving through the pipe. Definitely hot water moving out of the boiler when the taps are off.
     
  5. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    you sure its not the pre heat function ? make sure the eco setting it on (turns pre heat off)
     
  6. Chalked

    Chalked Plumber GSR

    With that sort of damage. I would be getting her insurance to sort it. Might have done other damage to the property.
     
  7. malx42

    malx42 New Member

    Hankas, we tried using the eco mode. That had no effect. The two plumbers / engineers who followed confirmed that was not the issue.

    Definately a huge leak under the concrete. A small weeping leak from a joint I can understand . but 2 litres a minute!
     
  8. Rob Foster

    Rob Foster Top Contributor!!

    Call insurance co, dig things up and get it sorted ...winter is coming and only cowboys will be on call soon to none regular customers. You can hear the jingle of their spurs as they walk up your drive
     
    • Funny Funny x 1
  9. Gasmk1

    Gasmk1 GSR

    water is lazy and will find its easiest route away which doesnt mean it will bubble up throught the concrete it will be heading down through any cracks
     
    • Like Like x 1
  10. Rob Foster

    Rob Foster Top Contributor!!

    2 litres a min is monster I am glad I don’t live downhill from you !
     
    • Agree Agree x 1
  11. malx42

    malx42 New Member

    But surely there will be a damp proof membrane, it’s a late 60s floor I think, so the water can’t go down!
     
  12. Chalked

    Chalked Plumber GSR

    Just get onto insurance.
    That’s another day wasted and another 2880 litres gone!
     
    • Like Like x 1
  13. Gasmk1

    Gasmk1 GSR

    late 60's may not have one but if it does it would track along tioll it found a way out
     
  14. Rob Foster

    Rob Foster Top Contributor!!

    It’s flooding in Australia as we chat
     
  15. malx42

    malx42 New Member

    The hot water outlet is now turned off at the the valve on the boiler. So now the heating is working.
     
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