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Thread: Any Plumbers on here ?

  1. #1
    Regular Member markm's Avatar
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    Default Any Plumbers on here ?

    i'm just having an extension built to make room for the Baby and I'll be installing 3 new rads,

    I have a Worcester 28CDI boiler and all pipe work is currently 15mm cooper pipe,

    Question is, can I use 10mm pipe for the additional with 10mm->15mm reducers or can I use plastic pipes

    Which is best or should I stick with 15mm cooper pipe ?

    10mm cooper
    15mm cooper
    15mm plastic

    Cheers in advance Mark

  2. #2
    Full Member Big Sig's Avatar
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    I would say its completly up to you, my last house - new build, was all 10mm plastic pipe.
    Now I need a turbo to keep up!

  3. #3
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    If you run the system with different sized pipes it will be harder to regulate the temp equally across the system - the smaller pipes are more restrictive and you would have to add balance valves to all the 15mm copper to equal out the flow rates. Easier to stick to 15mm IMO. You can get push fit plastic in 15mm and its really good now.

    Heating runs from manifolds with every rad getting its own supply of hot water, because of this the water will take the easiest route - you probably have gate valves already to regulate the relative flow rates between upstairs and downstairs, maybe these could be used to make it all work down to the microbore flow rates but balancing it would be a ******.

  4. #4
    Regular Member markm's Avatar
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    Default

    so i could get away with 15mm platic pipe,

    will it last as long as the cooper ? just a little scared as it will be unber the floor and don't want to dig it all up in a few years

    cheers

  5. #5
    Regular Member ditchp's Avatar
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    Vehicle : Vectra cdti estate

    Trim : Get a

    Engine : Dirty diesel

    Year : 2006

    Default

    the plastic stuff is called HEP2o make sure you get all the sleves and fitting's for it, idealy if it is going into concrete just lag it to help protect it
    and yes 15mm is good
    Midlands Mod Shop - NFFC.

  6. #6
    Regular Member gtr1000's Avatar
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    Vehicle : Insignia

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    Default

    I've always used John Guest "Speedfit", not cheap but really good and easy to cut, join etc. Their pipe can be used in underfloor heating and buried in concrete so longevity doesn't appear to be a problem.

    http://www.johnguest.com/

  7. #7
    Full Member chunkster's Avatar
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    for a pressureized system as the 28cdi is, john guest speedfit is the better plastic pipe. hep20 will do the job but its the way the pipes seal that makes the difference. hep20 seals using grip rings to clamp the pipe, speedfit uses pressure rings so the more pressure there is, the tighter it grips the pipe.both pipes can go under the floor and you can buy it in coils of 25,50,100mtr's so you can reduce the amount of fittings hence less chance of leaks
    Wayne -

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