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So we switched from a vented HW tank to an unvented one about 4 months ago (rads were already on an unvented loop) for pressure and volume reasons. Ever since it's been installed we've had a loud humming noise/vibration in the airing cupboard whenever the hot water is on. We've had the installer...

Hi all, We moved into the house July 22 and, apart from the occasional top up, have had no issues with boiler, HW or CH. Recently, however, we've started having issues with the pressure on the boiler but only when only the HW is on. What happens is that I can check the pressure all day long...