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Discuss Delayed hot water even after using hot water in the Plumbing Forum area at

  1. Vaxer

    Vaxer New Member


    Just noticed this since Friday, but after using the hot water tap in the kitchen, which is only a couple of meters from the combi boiler, the water is cold and takes a while to warm up. The burner fires up after 10-15 seconds for the water to start getting hot. Immediately after turning off the tap and turning it back on, the burner is off and then re-fires for the water to get hot again. The temperature on the combi goes down and then starts to climb again when the burner comes on. Could someone tell me what the problem is?

    Thanks in advance.
  2. Riley

    Riley Plumber GSR Top Contributor!!

    Only at the kitchen tap??
  3. Vaxer

    Vaxer New Member

    at the kitchen tap and the bathroom basin upstairs.
  4. TamzJnr

    TamzJnr New Member

    Is the boiler coming on and then cutting out while the hot tap is still running? It could be the overheat stat is faulty. But normally when this happens a light will be flashing on your boiler.
  5. TamzJnr

    TamzJnr New Member

    If it’s taking an age before it comes on it could also be the H/W diaphragm in the diverted valve that’s worn and needs replacing.
  6. jtsplumbing

    jtsplumbing Plumber GSR

    Be careful how much information you give , People will ask on here then next thing you know they have the boiler in bits
    • Like Like x 1
    • Agree Agree x 1
  7. Chalked

    Chalked Plumber GSR

    Lack of flow . Not bringing the boiler on. Try removing the ends of the tap spout. They might be just blocked.
  8. scott_d

    scott_d Plumber GSR

    What make and model is the boiler?
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