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Change a PRV on an unvented cylinder

Discussion in 'Plumbing and Central Heating' started by koomber, 9 Aug 2018.

  1. koomber


    30 Jul 2007
    Thanks Received:
    United Kingdom
    Evening chaps, couple quick questions. I'm doing up the bathroom and have an unvented cylinder. Not sure on the make, but it's about 15 year old and works okay. Had it checked by a plumber and everything works as it should apparently.

    The only annomaly is that the flow can be a bit low, but this only affects it when the electric shower takes cold water from the output side and is easily fixed by turning a tap in the bathroom on and off.

    Anyway the system is fixed at 2.1 bar. When using the hot water, say filling a bath, the pressure drops to at worst 1.5 bar, but the flow absolutely pelts out at about 20L/min.

    My question is should I get the pressure reduction valve swapped out just now whilst everything is out? As far as I'm aware this is a job which will need to be undertaken by a qualified individual. What is the certification that they should have?

    Many Thanks,

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