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Poor pressure from thermostatic mixer

Discussion in 'Plumbing and Central Heating' started by matthewjsummers, 31 Mar 2016.

  1. matthewjsummers

    matthewjsummers

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    Hi everyone

    I have just replaced the shower mixer in one of our bathrooms with this

    http://www.victorianplumbing.co.uk/...ic-Bar-Valve-Bottom-Outlet-Chrome-VBS001.aspx

    The hot water pressure out of tap is excellent - just had a new 40kw combi installed delivering 16lpm. Pressure out of the mixer is okay but not what it could be.

    Is it because the mixer is cheap? We have 2 more to fit and am wondering about trying more expensive mixers if this is cheap? If not, has anyone any idea if it can be adjusted?

    Thanks
    Matt
     
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  3. flameport

    flameport

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    What size and type of shower head?

    By pressure, do you mean flow? Have you measured it?

    In any case, a combination boiler with 3 bathrooms is a total fail.
     
  4. mwerty

    mwerty

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    Hi

    It's a 10cm diameter shower head, not sure of the make. Fairly cheap though, about £15 for the head.

    There are only two of us in the house so combi boiler is fine - the boiler easily supports two showers at the same time, but my question was more about whether anyone had an opinion on whether a cheap thermostatic mixer can affect the pressure?
     
  5. dilalio

    dilalio

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    Where did you measure 16l/m?
    Where is this shower head in relation to that? What can your boiler output: temp/litres per minute?
    Are you evaluating shower output whilst additional draw offs are being used?
     
  6. mwerty

    mwerty

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    Sorry - I meant flow, by the way, not measured it yet.
     
  7. ianmcd

    ianmcd

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    as already advised its flow rate you are talking about, you need to measure it pressure means nothing
     
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  9. mwerty

    mwerty

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    OK, so kitchen sink flow rate is 10.5l/m @ about 60 degrees C. Shower flow rate is 6.6l/m @ same temperature.
     
  10. Tay7

    Tay7

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    Might be your hoses especially if it came with a cheap head.

    Cheap ones tend to be really narrow bore which is restrictive. You can get wide bore ones to replace.
     
  11. dilalio

    dilalio

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    And where is shower outlet in relation to kitchen sink? Height in approx meters?
     
  12. mwerty

    mwerty

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    Shower outlet is almost directly above kitchen sink, 1 storey above.
     
  13. mwerty

    mwerty

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    Thanks everyone for input - did some more testing and...

    I think that it could be the shower head.. Measuring the rates has led me to determine:

    10l/m directly from mixer.
    10l/m from end of hose (without head on).
    6.6l/m from shower head.

    Cheap shower head! Can anyone recommend a shower head that will output 10l/m? It seems that none of them specify a rating for the flow rate?
     
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