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Update: After going down the rabbit hole I've done a few more tests and have made more discoveries. The system is set up with a single flow/return to the boiler. At the tank there are two valves: one for CH and another for HW. There is also a 15mm return with no valve that goes to the two bath...

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...

So I did as you said and watched it for the rest of the day and here are the results: From 1430-2200 (standard CH time, HW was on from 1430-1500 and 2000-2030): Boiler at 1.5-2bar No water from PR pipe 2200-2230 (0-30 mins after CH off): Boiler at went from 1.5bar to 0bar over that 30 minute...

It means the bathroom rads come on all year round for a short time so towels can dry even when it's too warm for full CH to kick in. I've found it quite a good feature over the past year that I've lived here.

Will do. I'll update you asap. Thanks.

There is only one copper pipe that runs outside from the boiler and it comes out of the wall horizontally then loops back on itself so it's facing the wall. Would that be the right pipe to look at?

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...