Worth increasing pipe sizes

Discussion in 'Plumbing and Central Heating' started by williamglossop, 14 Jan 2022.

  1. williamglossop

    williamglossop

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    I'm running pipes to location for a new combi. The flow and return are 22, so ill run them in 22. The DHW and cold inlet are both 15 at boiler. Would there be any benefit in running up to the boiler in 22 then reducing to 15 at boiler? Or just run it in 15 all the way to the boiler.
     
  2. terryplumb

    terryplumb

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    15 mm ,copper. No point in using 22mm for cold feed and DHW.
     
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  4. williamglossop

    williamglossop

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    Understood. But it will be PEX to within a meter or so. Does that alter your opinion?
     
  5. terryplumb

    terryplumb

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    Do it all in copper ,soldered fittings, don't bury it in concrete ,then forget about it all for around 50 years !
    That's my opinion ,for what it's worth.
     
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  7. sxturbo

    sxturbo

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    If doing it in plastic, might be worth going for 22mm as the plastic fittings are rather restrictive
     
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