22mm after 15mm

Discussion in 'Plumbers' Talk' started by Kmcc, Oct 17, 2021.

  1. Kmcc

    Kmcc New Member

    Hi all,
    I've currently got 22mm running to my bathrooms (2 showers)/ kitchen; and there is a 28mm feed into the building but it reduces down to 15mm in between.

    Is there any benefit to swapping out the 15mm to 22mm? Am i constrained to the flow rate of the 15mm for everything past it?
    Or is it all fine?

    Everything is running off a combi boiler.

    Thank you.

    Kev
     
  2. terrymac

    terrymac Screwfix Select

    Your combi delivers hot water from a 15 mm outlet ,there would be no point having anything after that in 22 mm ,in fact 22mm will just hold more water , invariably cooled , that needs to be displaced before hot reaches outlets,taps / showers.
    Similarly anything after 15 mm on cold mains is pointless being larger diameter.
     

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