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Many thanks for taking the time for your detailed inputs to my enquiry - I will contact the G3 installer and ask him ensure the EV pressure is correctly set-up for the incoming mains pressure. Hopefully that will stop the shuddering noise that seems to coming from EV when the hot taps are first...

Many thanks Madrab and Johntheo5 for your helpful replies. The UV cylinder is a Gledhill ES 250 with a nominal capacity of 248 litres and the EV volume of 25 litres pre-charged to 3 Bar pressure. I'm not sure about the exact mains inlet pressure, but I think it was measured at just under 3 Bar...

Hi, Can anyone advise me where the best point is on a unvented hot water cylinder system to measure DF water pressure? Would it be the balanced cold outlet on the combination valve? The unvented HW system was recently installed and I've noticed that it makes a shuddering noise when the hot...