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New radiator pipe work - 10mm system. Can I use 15mm for just one room?

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Comments

  • 531063
    531063 Posts: 291 Forumite
    Fifth Anniversary 100 Posts Name Dropper
    I asked a heating engineer about this a while ago, he said be careful as it could put the pump in the boiler under added pressure
  • grumbler
    grumbler Posts: 58,629 Forumite
    Part of the Furniture 10,000 Posts Name Dropper Photogenic
    edited 12 February 2023 at 11:53AM
    531063 said:
    I asked a heating engineer about this a while ago, he said be careful as *it* could put the pump in the boiler under added pressure
    What exactly?
    Using 15mm instead of 10mm? Obviously no.
    Adding an extra 10mm loop? Again, no - obviously.
    In both cases the pressure can only drop. The flow can slightly rise, but, if needed, it can be adjusted with lockshield valves.

  • Microbore systems are commonplace. What's more, with TRVs, a reduce flow/increased resistance is exactly what happens. A pump ain't going to suffer.
  • markin
    markin Posts: 3,860 Forumite
    Sixth Anniversary 1,000 Posts Name Dropper Photogenic
    I think i would just extend the 22mm out if its going to feed the room below one day? And if a heat pump is one day on the cards it would all need to be replaced anyway with 22mm/15mm.
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