Nest V3 Wiring

[kramadana]

Hi all,

Hopefully someone here can tell me if this is possible or not??

I've just had installed an unvented tank with 2 Honeywell zone valves to my existing Worcester Bosch 30i combi Boiler which forms an s plan format.

I also had a Nest V3 thermostat attached to the boiler before this just for the radiators. Now that I have a tank I wanted to use Nest to schedule as well.

The nest s plan diagrams, attached, look to me as though I should connect the boiler call to action and water call to action but as far as I know the water in the tank is heated by the radiator circuit? I'm probably being quite thick!

Thanks for any advice.

 

[Crofton Gas]

The cylinder is heated by a separate zone (2 port valve) from the boiler flow.

 

[kramadana]

The cylinder is heated by a separate zone (2 port valve) from the boiler flow.

So where do I connect the hot water tank n/o and Com to?

 

[Crofton Gas]

The n/o and common on the cylinder thermostat.