Nest Thermostat installation

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Nest Thermostat installation

Post by Arul13 » Thu Oct 11, 2018 8:56 pm

I am a keen DIY person. My question is on how to install Nest 3rdGeneration thermostat to Vaillant Eco tek Plus 835 combi boiler.

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Re: Nest Thermostat installation

Post by ahfix » Fri Oct 12, 2018 9:08 am

I'm afraid I can't answer your question directly but to get you started ... The exact answer depends on your current set-up and whither you want to power the nest from the boilers 12v feed or are using an external power source.

The boiler circuit board will have terminals for connecting an external thermostat. You'll need the wiring diagram which is usually in the boiler manual, from that identify the pins for the current thermostat.

Page 10 of the Nest manual describes the wiring (from the boiler) to the Nest heat link: ... ide-UK.pdf

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