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Combi boiler needs gas supply pipe to be larger?

Discussion in 'Plumbing and Central Heating' started by Rdl, 24 Jul 2016.

  1. Rdl

    Rdl

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    Hi all, I have recently been looking to Renew my boiler. I have a Potterton Suprima 40 getting on in years and fancy having a little more space in our wee house, so have decided to have a combi boiler installed in the garage, and have the hot water tank removed from the airing cupboard along with the tanks in the loft. After having a quote from a recommended local firm I was advised that my 2001 gas supply to my boiler would need to be upgraded to a larger bore, is this common, and would there be anything against changing from a traditional condensing system to a combi one. We have been recommended to go for a Worcester Bosch Green star for our 3 bedroom. Thanks for reading this. All comments welcome on this issue as it is stressing us out a little.
     
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  3. Dan Robinson

    Dan Robinson

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    Gas pipe upgrade would be almost certainly required.

    Would avoid Wooshitter Botch though.
     
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  4. gasmanstu72

    gasmanstu72

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    yeah, more or less every combi boiler nowadays needs a 22mm gas pipe at least.
    your existing Suprima is 40,000 btu input which equates to about 12 KW in new money, a combi for your house will be at least 30KW i would think, so it's more than double the output which is why it needs a more gas!
    although it'll only really use its full output when heating your water on demand.

    depending how far away from the gas meter the boiler is it could even need 28mm, especially if you're going for a boiler with a higher output, some combis are 42KW
     
  5. just pumps

    just pumps

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    You haven`t mentioned any bath or showers yet, could be problems if you have more than one.
     
  6. picasso

    picasso

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    Why is it stressing you out ? do you think your being told lies.
     
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  7. Rdl

    Rdl

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    Thanks for all the replies, I take it Worcester Bosch are not recommended by most . What seems to be the better brand to go for?, and the gas supply to the house comes in via the garage so that is an added bonus. The house currently has 1 bathroom and one en suite shower, would that make a lot of difference on top of 11 radiators?
     
  8. Dan Robinson

    Dan Robinson

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    Heating is irrelevant. It is the hot water.

    No Combi will do two showers at once so it comes down to bath fill times.

    A 24kw boiler will be more efficient than a 30, but the bath will fill marginally quicker.


    My boiler of choice is the Intergas Eco RF. Especially now that the inTouch is here for remote management and control.
     
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  10. petit_pablo

    petit_pablo

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    Nothing wrong with the Worcesters as long as it's a Cdi model. Worcester aren't popular on here but BG and other firms fit thousands with very little trouble overall.
     
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  11. simond

    simond

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    I fit them, lots of. Hardly any problems, and if something does go wrong, they've got the best support in the business.
     
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  12. gasmanstu72

    gasmanstu72

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    i've also fitted lots of Worcesters, never had many problems with any in the range
     
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  13. hertsboilers

    hertsboilers

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    I don’t agree with above two fellow gas men on Worcester boilers. Apart from their CDi classic series, all other current WB ranges have problems on hydraulic parts, eg, to change a PRV or replace a DHW heat exchanger, lol.

    They are decent boilers, but not the best boiler as they claim to be.
     
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  14. muggles

    muggles

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    I'd also recommend Intergas, great boilers with very few parts, made of metal, extremely reliable and very easy to work on
     
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  15. Rdl

    Rdl

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    I will have a good look the intergas models esp the Eco RF and possibly go down the power shower route for the main bathroom, especially when it will be the furthest room from the boiler. Many thanks all.
     
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  16. DIYnot Local

    DIYnot Local

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