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Tap needs refitting ,it sounds like it needs swivelling to the right so mid position is central

Contact Richard burrows at the intergas shop

It would need looking at as it could be piped in various ways ,the cylinders notin use don’t want leaving with stagnant water in.

Possibly had high pressure taps fitted to a low pressure system

Could be air in pipes.. Have you got mixers?

If you can get that in why can you get copper in ?

Only going of my experience having fitted a lot and cleaned them when servicing .

Quality filter you won’t have any trouble with the valve leaking. Remove cap ,it also fits the valve to turn on/ off.no need to drain...

No any combination

Possible,is heating working ? , have you an air vent on hot water cylinder

Designed for a tank 5 mm ish thick ,your tank is thinner ? So run out of thread,puta second washer on the outside.

It’s nearly 5 years old don’t think it’s under warranty,asCBW said probably synchron motor

Thanks guys appreciate your help I'll split into two zones with valves for the heating & UFH with an automatic bypass valve between the...

If you want to separate the underfloor and rads yo will need 2 zone valves so they can be used individually

OK… well, as people were kind enough to try and help me, I thought I’d publish an update. As usual, Laurel & Hardy ignored all attempts...