Hi, I am hoping to get some help to see if Nest learning Thermostats 3rd gen is compatible with my current system.
I am based in Ireland and I have multi-zone heating and hot water, I have one thermostat in each zone and a 3-way programmer to control. (this one https://www.mrcentralheating.co.uk/pub/media/catalog/product/ESi-ES3247-3CH-Prog-Install-Guide.pdf wiring from page 19)
I wanted to know if it's is easy to install - that I could use the wire on my current programmer and don't have to touch the boiler. I think I will keep the old thermostats just set them on the max setting and replace the programmer with the heat link. But looking at nest's wire diagram I am a bit confused, am I going to lose multi-zone control as nest seems only takes hot water and heating?
Here's a picture of the wiring of my programmer.
The UK/Europe version of the Nest Learning Thermostat with the HeatLink should be able to work for you.
Unfortunately, I know nothing about how to set that version up.
If you are asking if the USA/Canada version will work, then no. You system is using line voltage and the US/Canada version is 24Vac only.