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thanks all have replaced bathroom section of 15 for 22, few hours work (1 forward 2 back!) so will see how it goes with shorter section of 15 from loft tank to that. Not massively keen on pumps tbh as the ones i have seen/ used in the past are noisy. Things have probably moved on since then but...

Long term hopefully 6 months. No restrictors in mixer, nrv in hot feed only, full bore valves on both 15mm feeds bar. Tempted to replace bathroom pipe in 22 leaving the rest in 15 see if it changes, changing a few metres of 15 might show if its worth it?

hi, just updating bathroom and fitting a thermo bar shower to replace a tap shower feed. Old tap feed also only had tank cold and mains hot so was a nightmare to balance out and not get backfeed and cold shower. Anyway, hot water from vented cylinder is 22mm, had fitted a new feed from the cw...