Hi sackers The most obvious reason is that maybe debris has been allowed to enter your pipe work when the meter was fitted. Did the installer flush your pipe work? The other reason may be linked to the minimum pressure needed by these shower to seal the inlet valve in the off position which is 0.2bar. Can the supply pressure have been reduced so that when mains taps are turned on in your house the pressure drops? Regards S
Many thanks for your timely and informative reply Stoneboy, this is much appreciated. The water pressure seems bang on the statutory minimum, with the rudimentary kitchen tap + 1 litre container method returning a flow rate of 6 seconds per litre, so 1b.
Whether the installer flushed the pipework through susbsequent to installation of the meter will forever remain a mystery I'm afraid as I left him to it while I was doing other things, so internal debris could potentially be the cause of the problem.
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