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OK, much as I thought - lump it or change the tap. Thanks for the input everyone.

Yes, I suspect the tap is the root cause but that's the one she likes. Just wondering if replacing the final 15mm section so it's 22mm from cylinder to tap tail would make any appreciable difference.

I have a gravity fed hot water system (header tank in roof with hot water cylinder upstairs). The hot water system is plumbed with 22mm as far as the upstairs bathroom, but where it drops down into the kitchen downstairs it uses 15mm pipe. The hot water flow rate in the kitchen is not...

Fixed :D Thanks to the superb animated diagrams and the suggestions to check/trace the HW signal from the programmer to the HW stat, I’ve found the problem. Programmer was giving correct signal, which was making it as far as the Honeywell wiring centre upstairs, but not to C terminal for the...

Thanks everyone, will check with voltmeter. Oilhead: If both heat and hot water selected boiler doesn't run - it will only run when hot water is switched off (and heating on of course)

Thank you. Yes, definitely Y plan. Will take a look and see if I can get some pointers.

I have a Worcester Danesmoor (circa 1990) oil fired boiler with Honeywell Y plan control system. All been working fine for many years, but I now have a strange problem. As of this weekend we are having an issue with Heat vs Hot Water. With CH On and HW Off from the programmer then CH works...