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Yes I know it invalidates the warranty. And I know the recommended operating pressure is 3 bar. But on a large unvented system (3 showers, 4 toilets, 4 storey house), if I was to fit a pressure reducing / fluctuations valve with a return / bypass and PVR and set it to 4 bar to match the mains...

Hi all, I have a 300L Telford Tempest unvented cylinder in my basement. I live in a tall 4 storey Edwardian semi-detached - the height of the property does affect our water pressure to the bathrooms on the 2nd floor - the water is having to travel a hell of a long way! The water pressure...