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Low to no pressure in hot water taps

  • 02-02-2021 10:55am
    #1
    D13exile
    Registered Users, Registered Users 2 Posts: 728 ✭✭✭


    I bought my house three years ago (built circa 1995) and since I moved in, I have very low to sometimes no pressure in all the hot water taps (kitchen, downstairs loo, utility, and main bathroom upstairs). When there's nothing coming from the hot water taps, I do the tried and trusted method of using the cold water tap (mains supply in the kitchen) to blow through the hot water lines by using the mixer tap in the kitchen (ie cover the outlet with my thumb, open the hot side and then open the cold water side). This works and I then get the hot water flowing again. However the pressure in the hot water lines is always poor. While I know its a gravity fed system, the pressure always ends up tailing off and then the water flow stops again until I repeat the above. Any idea what's causing this as it affects all the hot water taps in the house. I was thinking about getting a booster pump but I'd be worried that the 26 year old pipework might not hold up to an increase in pressure.


Comments

  • #2
    delboythedub
    Registered Users, Registered Users 2 Posts: 355 ✭✭delboythedub


    D13exile wrote: »
    I bought my house three years ago (built circa 1995) and since I moved in, I have very low to sometimes no pressure in all the hot water taps (kitchen, downstairs loo, utility, and main bathroom upstairs). When there's nothing coming from the hot water taps, I do the tried and trusted method of using the cold water tap (mains supply in the kitchen) to blow through the hot water lines by using the mixer tap in the kitchen (ie cover the outlet with my thumb, open the hot side and then open the cold water side). This works and I then get the hot water flowing again. However the pressure in the hot water lines is always poor. While I know its a gravity fed system, the pressure always ends up tailing off and then the water flow stops again until I repeat the above. Any idea what's causing this as it affects all the hot water taps in the house. I was thinking about getting a booster pump but I'd be worried that the 26 year old pipework might not hold up to an increase in pressure.
    Had a very similar problem and it turned out to be a Gate valve that was only partially open. Opened valve and hot water pressure back to normal. I thought it was the water pump. Hope all works out for you


  • #3
    D13exile
    Registered Users, Registered Users 2 Posts: 728 ✭✭✭D13exile


    delboythedub wrote: »
    Had a very similar problem and it turned out to be a Gate valve that was only partially open. Opened valve and hot water pressure back to normal. I thought it was the water pump. Hope all works out for you

    Thanks. I checked all the valves and they are open fully. There are no isolator valves on the system either. I'm stumped tbh.


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