Using 10MM pipe for bathroom and kitchen taps

Discussion in 'UK DIY' started by Peter Charlwood, Nov 14, 2003.

  1. Just wondering if anyone has done this before and if there are any
    potetial problems with doing it. Also i am installing a combi boiler
    and was wondering what sort of pipe size i should use for the
    shower/bath.

    I would think 10mm would be to small for the shower/bath but doing
    really want to go over 15mm due to space. what would be a reason for
    having say 22mm pipe over 15mm.

    Thanks for your help.

    Pete
     
    Peter Charlwood, Nov 14, 2003
    #1
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  2. Peter Charlwood

    fred Guest

    In article <>, Peter
    Charlwood <> writes
    >Just wondering if anyone has done this before and if there are any
    >potetial problems with doing it. Also i am installing a combi boiler
    >and was wondering what sort of pipe size i should use for the
    >shower/bath.
    >
    >I would think 10mm would be to small for the shower/bath but doing
    >really want to go over 15mm due to space. what would be a reason for
    >having say 22mm pipe over 15mm.

    I currently use 15mm copper for the 16m run to my bath and that is
    adequate but I do have a very high head on my H/W supply (~20m). I did
    try it with 10mm but it was just too small and the bath took ages to fill.

    I have a 3m run to my kitchen sink in 10mm and that is fine but if the run
    was any longer, I don't think it would be adequate.

    Pros are less time to get hot water to the taps and also less wasted hot
    water sitting in the pipe when you are finished, but cons are greater
    interaction between taps eg, no flow from sink tap while filling a bath, but
    you will get that with a combi anyway.

    If I ever get this house finished it will have separate small bore feeds to
    each bath/shower/large sink.

    btw, be aware that plastic pipes have a smaller internal diameter than
    copper and so will be more restrictive for a given (outer) size.
    --
    fred
     
    fred, Nov 14, 2003
    #2
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  3. Peter Charlwood

    Rick Dipper Guest

    Fatter the pipe, higher the flow.

    In your case this stops being true when the pipe is so fat the bioiler cant heat the water fast enough.

    Rick

    On 14 Nov 2003 05:07:14 -0800, (Peter Charlwood) wrote:
    > Just wondering if anyone has done this before and if there are any
    > potetial problems with doing it. Also i am installing a combi boiler
    > and was wondering what sort of pipe size i should use for the
    > shower/bath.
    >
    > I would think 10mm would be to small for the shower/bath but doing
    > really want to go over 15mm due to space. what would be a reason for
    > having say 22mm pipe over 15mm.
    >
    > Thanks for your help.
    >
    > Pete
     
    Rick Dipper, Nov 15, 2003
    #3
  4. Peter Charlwood

    Kalico Guest

    > On 14 Nov 2003 05:07:14 -0800, (Peter Charlwood)
    wrote:
    > > Just wondering if anyone has done this before and if there are any
    > > potetial problems with doing it. Also i am installing a combi boiler
    > > and was wondering what sort of pipe size i should use for the
    > > shower/bath.
    > >
    > > I would think 10mm would be to small for the shower/bath but doing
    > > really want to go over 15mm due to space. what would be a reason for
    > > having say 22mm pipe over 15mm.
    > >
    > > Thanks for your help.
    > >
    > > Pete

    >
    >

    10mm is too small and 15mm should be ok. Usually, baths have 22mm to the
    taps but 9 times out of 10, this comes off a 15/22/15 tee, so no benefit to
    the 22 mm.
     
    Kalico, Nov 15, 2003
    #4
  5. Peter Charlwood

    Steve Firth Guest

    Peter Charlwood <> wrote:

    > Just wondering if anyone has done this before


    It's the standard size for domestic water in much of the rest of Europe,
    but only for short runs - i.e. 15 or 20 mm is used for the majority of
    the run, then 10mm from the wet wall to the tap.

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    Steve Firth, Nov 15, 2003
    #5
  6. In article <>,
    (Peter Charlwood) writes:
    > Just wondering if anyone has done this before and if there are any
    > potetial problems with doing it. Also i am installing a combi boiler
    > and was wondering what sort of pipe size i should use for the
    > shower/bath.
    >
    > I would think 10mm would be to small for the shower/bath but doing
    > really want to go over 15mm due to space. what would be a reason for
    > having say 22mm pipe over 15mm.


    I wouldn't want to use 10mm for a bath, although there's about 15"
    of it doing my washbasin tap, and the flow is probably good enough
    for a bath with good mains pressure behind it (and rather high for
    a washbasin;-).

    I would use 22mm for a long run from a header tank. I would avoid it
    for a run to short use hot tap, as it will increase the amount of
    cold water wasted waiting for hot to run through. When replumbing
    my house, I swapped all the 22mm for 15mm as it's all mains water
    pressure. None of the runs were long, but it did make a noticable
    improvement to the time for water to run hot. Made no noticable
    difference to flow rate.

    --
    Andrew Gabriel
     
    Andrew Gabriel, Nov 17, 2003
    #6
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