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Hi all, I'm looking to get the latest Nest Thermostat (3rd Gen) and have a c-plan HW gravity feed hot water system wired like the following diagram (although I have only to wires from the Room Stat): My existing programmer is wickes/siemens RB9_i, which doesn't allow for HW and Heating to be...

Hi all, I need some help with the above. I've attached a picture if the internal wiring of my existing thermostat, as well as the wiring diagram on the inside of the cover. I've purchased a siemens RDH10 digital room thermostat which has LX (common) connector and L1 Switched and L2 which...