fluctuating water temp on new combi

Discussion in 'UK DIY' started by pauly, Mar 21, 2005.

  1. pauly

    pauly Guest

    Not really a DIY question however this is the most appropriate group i can
    find.

    I just had a new combi boiler fitted to replace an old system with boiler
    and immersion. Problem is the water temperature varies quite a lot -
    sometimes its blazing hot and give it a minute and it goes cold before
    getting too hot again.

    The guy who fitted it is really good (reputation) and am trusting him to
    figure it out however i've got curious as to what it could be.

    What could be the cause?

    fwiw my house is a 3 bed semi 30 years old and no water supply problems that
    i've noticed. New boiler is a Worcester.

    Thanks

    Paul
     
    pauly, Mar 21, 2005
    #1
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  2. pauly

    John Guest

    "pauly" <> wrote in message
    news:...
    > Not really a DIY question however this is the most appropriate group i can
    > find.
    >
    > I just had a new combi boiler fitted to replace an old system with boiler
    > and immersion. Problem is the water temperature varies quite a lot -
    > sometimes its blazing hot and give it a minute and it goes cold before
    > getting too hot again.
    >
    > The guy who fitted it is really good (reputation) and am trusting him to
    > figure it out however i've got curious as to what it could be.
    >
    > What could be the cause?
    >

    various things but as a starter can you quote the commissioning figures he
    has filled in for model number, water temperatures, flow rates, gas rate etc
    on your little blue benchmark book that came with the boiler
     
    John, Mar 21, 2005
    #2
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  3. pauly

    a Guest

    > Not really a DIY question however this is the most appropriate group i can
    > find.
    >
    > I just had a new combi boiler fitted to replace an old system with boiler
    > and immersion. Problem is the water temperature varies quite a lot -
    > sometimes its blazing hot and give it a minute and it goes cold before
    > getting too hot again.
    >
    > The guy who fitted it is really good (reputation) and am trusting him to
    > figure it out however i've got curious as to what it could be.
    >
    > What could be the cause?
    >
    > fwiw my house is a 3 bed semi 30 years old and no water supply problems

    that
    > i've noticed. New boiler is a Worcester.


    I must say I have found our worcester combi a bit more awkard than having a
    hot water cylinder. I find you cant really have the hot taps on just a
    little as you need a certain flow before the boiler kicks in (so the water
    stays cold), opening it a bit more and the boiler kicks in and the water
    becomes mad hot, only when the tap is open about half way (a ceramic tap) do
    I get a nice hot temperature that doesnt scold my hands! I cant say I have
    had the constant hot-cold-hot... with a constant flow.
     
    a, Mar 21, 2005
    #3
  4. pauly

    Paul Guest

    In news:d1n2ao$l5i$,
    John <> typed:
    > "pauly" <> wrote in message
    > news:...
    >> Not really a DIY question however this is the most appropriate group
    >> i can find.
    >>
    >> I just had a new combi boiler fitted to replace an old system with
    >> boiler and immersion. Problem is the water temperature varies quite
    >> a lot - sometimes its blazing hot and give it a minute and it goes
    >> cold before getting too hot again.
    >>
    >> The guy who fitted it is really good (reputation) and am trusting
    >> him to figure it out however i've got curious as to what it could be.
    >>
    >> What could be the cause?
    >>

    > various things but as a starter can you quote the commissioning
    > figures he has filled in for model number, water temperatures, flow
    > rates, gas rate etc on your little blue benchmark book that came with
    > the boiler


    I haven't seen the book you mention yet. Do you mean figures obtained after
    testing or manufacturer figures for that particular boiler?
    The Model is a Worcester 28i Junior.... is this table any use?
    http://tinyurl.com/3sq4a (its an image on worcester-bosch.co.uk)

    Paul
     
    Paul, Mar 21, 2005
    #4
  5. a wrote:
    > > Not really a DIY question however this is the most appropriate

    group i can
    > > find.
    > >
    > > I just had a new combi boiler fitted to replace an old system with

    boiler
    > > and immersion. Problem is the water temperature varies quite a lot

    -
    > > sometimes its blazing hot and give it a minute and it goes cold

    before
    > > getting too hot again.
    > >
    > > The guy who fitted it is really good (reputation) and am trusting

    him to
    > > figure it out however i've got curious as to what it could be.
    > >
    > > What could be the cause?
    > >
    > > fwiw my house is a 3 bed semi 30 years old and no water supply

    problems
    > that
    > > i've noticed. New boiler is a Worcester.

    >
    > I must say I have found our worcester combi a bit more awkard than

    having a
    > hot water cylinder. I find you cant really have the hot taps on just

    a
    > little as you need a certain flow before the boiler kicks in (so the

    water
    > stays cold), opening it a bit more and the boiler kicks in and the

    water
    > becomes mad hot, only when the tap is open about half way (a ceramic

    tap) do
    > I get a nice hot temperature that doesnt scold my hands! I cant say I

    have
    > had the constant hot-cold-hot... with a constant flow.


    Which model have you got? You could always turn the DHW temperature
    down on your boiler (assuming it's got one)!
     
    Mathew J. Newton, Mar 22, 2005
    #5
  6. pauly

    a Guest

    > > I must say I have found our worcester combi a bit more awkard than
    > having a
    > > hot water cylinder. I find you cant really have the hot taps on just

    > a
    > > little as you need a certain flow before the boiler kicks in (so the

    > water
    > > stays cold), opening it a bit more and the boiler kicks in and the

    > water
    > > becomes mad hot, only when the tap is open about half way (a ceramic

    > tap) do
    > > I get a nice hot temperature that doesnt scold my hands! I cant say I

    > have
    > > had the constant hot-cold-hot... with a constant flow.

    >
    > Which model have you got? You could always turn the DHW temperature
    > down on your boiler (assuming it's got one)!


    we have the Junior 24i I think. Is there any adjustment possible on the flow
    rate needed to fire up the boiler?
     
    a, Mar 26, 2005
    #6
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