Posting a message to the forum will remove the above advertisement
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. Checkout our Plumbers Insurance area - heavily discounted Public Liability Insurance and Van Insurance specifically designed for plumbers.

Discuss Water pump turns off as shower temperature is increased in the Plumbing Forum area at

  1. choffer74

    choffer74 New Member

    Hi all,

    We recently moved into our house and have had a few issues with the cold water and showers.

    The cold water goes from the tank through a water pump to the shower. hot water is fed from a combi-boiler.

    If you turn the shower on with the temp set to cold, you can hear the water pump kick in and the pressure if obviously fine. As you turn the temperature up pressure out of the shower head reduces, and then the cold water pump de-activates.

    We can get round it by having the sink tap running with cold water - this activates the pump. But its not ideal!

    Any suggestions?

    thanks in advance for any advice
  2. Rob Foster

    Rob Foster Top Contributor!!

    It might be that the mains and tank fed sides are unbalenced , this issue used to be a problem years ago, how old is your gaff ?
    centralheatking....what I am suggesting is that its not a component failure but a pre existing installation fault nit picked up when you bought the place. centralheatking
  3. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Just get your cold pipes to mains and do away with tank
    • Like Like x 1
  4. Ben-gee

    Ben-gee Plumber Top Contributor!!

    As Riley says, but don’t forget to remove the pump when this is done!
    • Like Like x 1
  5. Rob Foster

    Rob Foster Top Contributor!!

    dont forget to sell the pump on ebay. chking
    • Agree Agree x 1
  6. choffer74

    choffer74 New Member

    house is 20 - 25 years old.

    we live in a (very) low pressure area - so getting rid of the pump will cause other problems right?
  7. Rob Foster

    Rob Foster Top Contributor!!

    look the pump is in the wrong place , treat the disease not the symptom, get a big mains booster for the whole place, if you want I can specify
    Rob Foster aka centralheatking
  8. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Does the hot on your combi work?
  9. Rob Foster

    Rob Foster Top Contributor!!

    he said yes it just gets busted by the inequal pressure IMHO
  10. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    So get it tested rather than GUessand mains the cold surely??? If they need a booster a pro will tell them I’d be amazed if they had enough pressure for hot but not cold
    • Like Like x 1
    Last edited: Jan 8, 2019
Similar Threads - Water pump turns Forum Date
Instant hot water heater before or after pump? Bathrooms, Showers and Wetrooms Jun 3, 2019
No hot water from pump New Member Introductions May 12, 2019