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Given that my pipes are 22mm and say I bought a 22mm Honeywell, is the brass T-piece coupling on the unit exactly the same dimension. Could I just install it without altering the pipes in any way. I guess you consider the Honeywell a superior unit.

Thanks, that really nails it now hopefully. Been looking online at replacements and apart from being renamed Drayton they seem to be exactly the same so should be easy. I'll bear in mind what you said about the A and B. :)

Good tip on the gland nuts. Maybe like the outside tap for the garden hose that you can nip up a bit when it drips. :)

They are wheel head gate valves but I tried them out earlier today and they all travel freely. I expect they will drip a bit as I understand but that's a small price to pay. Thanks for reassurance that I don't need a system drain down.

And just realised something important you said, that the flow must be in one direction only. So I'll install the replacement in the same orientation in all respects. Would not want to play around with the pipework anyway. Beyond my abilities. Thanks.

Yes thanks D-hailsham that's right. The electrics are not underneath but the black tab is, and close to the floor so I can't really get to it or see it properly. Luckily there are isolating valves all around the unit so I'm thinking that I can replace it without draining the system. Would you...

Thanks for the very detailed reply. Seems to confirm what I suspected. As and when the valve becomes a real pain I'll get a replacement and make sure it's installed the right way. :)

Ferroli Sigma gas boiler ACL Lifestyle 679H340-30L0 3 port Horstmann ChannelPlus H27XL Series 2 programmer Satchwell (Sunvic) room thermostat CWS tank and header tank with bases at same level I am a novice at HW and CH but learning a lot thanks to this forum. Have searched all the threads...