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Low hot water pressure in kitchen

Discussion in 'Plumbing and Central Heating' started by spanner_monkey, 18 Dec 2020.

  1. spanner_monkey

    spanner_monkey

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    Hi, everyone..

    I have a problem with extremely low water pressure coming from my kitchen tap. It is a gravity fed system (no pump) with a hot water cylinder in the airing cupboard of a flat. Both bathroom and kitchen are on the same level.

    The water in the bathroom comes out really well. So well that you can have a shower with the hot tap on alone with no problems. The kitchen tap, on the other hand comes out as barely a trickle.

    I thought it may be the old tap or possibly valves in the kitchen that were impeding flow but with with everything now replaced and brand new, still no improvement.

    I don't understand how two taps on the same system that are roughly the same distance from the tank should have such different pressures. There must be something that is impeding the flow to the kitchen but I'm out of ideas as to how to find it.

    Can anyone give me any suggestions on how I can find this fault and get the water pressure in the kitchen to match the bathroom please?
     
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  3. terryplumb

    terryplumb

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    The tap itself must be suitable for low pressure system ,and the Pipework to it must also be non restrictive . If your tap is connected with silver coloured flexible hoses and isolation valves that are not full bore , that will be mostly the cause of your issue.
     
  4. spanner_monkey

    spanner_monkey

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    It's a standard tap, nothing unusual about it and the problem was there with the old tap as well.
     
  5. Harry Bloomfield

    Harry Bloomfield

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    Is it a quarter turn to full on type of tap, with a ceramic cartridge?
     
  6. terryplumb

    terryplumb

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    No such thing as a standard tap.
    Show pics of pipework under kitchen sink.
     
  7. spanner_monkey

    spanner_monkey

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    What i meant by standard is that it's just a separate hot and cold tap, not a mixer with no hoses or anything like that. The pipework is copper piping straight to the tap. I cant post pictures of it now as I'm not at home.

    It is a quarter turn on but the old one was an old full turn on/off type of tap.
     
  8. terryplumb

    terryplumb

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    Ok. Post pics when you can. Something is restricting the flow ,and isolation valves are a distinct possibility .
     
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  10. Harry Bloomfield

    Harry Bloomfield

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    There is your problem. Quarter turn ceramic cartridge taps needs mains pressure to work at full flow. You need to swap it out for an old fashioned multi-turn tap, which uses tap washers rather than a cartridge.
     
  11. terryplumb

    terryplumb

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    Same problem with original tap ,which was conventional screw down valve ,apparently Harry.
     
  12. Harry Bloomfield

    Harry Bloomfield

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    I see a mention of old tap and new one, but cannot see where it mentions the old one being a conventional type - perhaps the OP could confirm?
     
  13. terryplumb

    terryplumb

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  14. Harry Bloomfield

    Harry Bloomfield

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    Thanks Terry - I missed that bit :)

    The OP has a restriction then somewhere, but even if he fixes the restriction, he will still have a very poor flow due to that quarter turn cartridge restricting the flow.
     
  15. dal5band

    dal5band

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    Is the brand new isolating valve the same as the old one ? A full bore valve may improve things.
     
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