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I've had a look at the W plan info and judging from my valve wiring it looks like a mid pos valve. Ignoring the earth and neutral connections, it has white, orange and grey wires which are all connected (orange and grey to the cylinder stat, the orange also has a red connected which I guess goes...

Hi, I have what looks like a conventional Y-plan system, except that the very antique mechanical timer only does on or off. I think the system is arranged so that hot water gets priority over the heating. How difficult would it be to change the wiring to use a 2-channel programmer to get...