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Thanks for your help.

Great so as the diagram calls it - low voltage (dry contact) as I'll have N and L connected for power?

Any further help please?

Sorry, I'm not sure I follow - do you mean follow the low voltage diagram? From the manual I can only really see that there are 2 options and they're called switched live and low voltage. I'm going to be using two cables that run to the existing thermostat to power the Nest thermostat unit on...

If I have an Ideal Isar HE35 boiler when I install my Nest do I follow the switched live diagram or low voltage (dry contact) diagram? Thanks!