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Nest Thermostat - heat link wiring - UK

Community Member

Hi there,

I’m thinking about buying Nest Thermostat but I’m not quite sure if I will be able to wiring Nest Heat Link on my current programmer wires.

Programmer I’m using now is Siemens RWB29 which is mounted right under boiler and Siemens RAA20 thermostat which is in my living room also I think is worth to mention I’ve got Potterton Promax HE Plus boiler and hot water storage cylinder. 

My concern stems from the fact that my programmer has one cable for central heating and one for water heating. Basen on wiring diagram I supposed to have two of each for on/off option. 

Please find attached photographs of my current thermostat and wiring.

Thanks for help and advice.