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  • I can't see the point of changing all the pipe sizes unless there is a problem with flow, such as to the shower or bath. Oversizing all the other pipes and fittings only increases the opportunity to waste water and waste heat.
    I have just fitted free low flow aerators to the basin taps, they may save a few pence off the water bill https://watersavingdevices.thameswater.co.uk/

  • Looking to add a pump to the shower as flow isn't that great. Also fluid dynamics ;) looking to add filters to the drinking water and that will restrict the flow.

  • If you have decent pressure but poor flow then just increasing pipe size from mains to hot water to shower may solve the problem.

  • Have you measured the flow rate as any better elsewhere in the house? Tank or mains fed? And if the latter, lead into the house or plastic?

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