topic Re: Compatibility question before purchase in Nest Thermostats

Compatibility question before purchase

Stounino — Fri, 30 Sep 2022 09:02:34 GMT

Hi, before purchasing a Nest Thermostat (not yet decided whether to go for the Nest Learning or Nest E), I was wondering if my system is compatible. I live in an apartment (in France) with floor heating controlled with two thermostats in the house. Hot water is common and I don't have a boiler in my apartment so that is out of the table I guess.

Here is a picture of my current wiring, both thermostats are similar. Would that work with either the Learning or the E model? Also, is the Heatlink still a thing and necessary?

Thanks for your help!

Re: Compatibility question before purchase

CoolingWizard — Fri, 30 Sep 2022 16:50:36 GMT

Your system uses high voltage (230VAC) and that is not compatible with Nest Learning Thermostats.

Re: Compatibility question before purchase

Stounino — Fri, 30 Sep 2022 17:56:39 GMT

Hi, thanks for your help and your reply. Where exactly do you work?

I'm not sure about your answer as 230V is quite standard in France and it is even mentioned in the Nest installation guide:

Re: Compatibility question before purchase

CoolingWizard — Fri, 30 Sep 2022 18:04:14 GMT

Stounio, I am located in the United States. Your current thermostat only switches 230v L to L1 to initiate heating.

Re: Compatibility question before purchase

Stounino — Fri, 30 Sep 2022 18:37:15 GMT

So Nest Learning can not do that with the schematics above?

Re: Compatibility question before purchase

CoolingWizard — Fri, 30 Sep 2022 19:03:58 GMT

Unfortunately no. I know in European markets the Heat Link is included with a Neat Learning thermostats. The Heat Link is designed to interface with the typical European heating systems. The Nest learning thermostat system is connected to the HVAC cooling system and the Heat Link is connected to the heating system. The Nest Learning thermostat is what communicates with the Heat Link to control the heating system.

Re: Compatibility question before purchase

Stounino — Fri, 30 Sep 2022 19:11:08 GMT

So if I get the Nest with the Heat Link included and wire the Heat Link with the heater, it should do the trick in my case, right? Then, I would just have to hook the Nest Learning thermostat to power and it would communicate with the Heat Link to handle the opening/closing of the heating circuit.

Re: Compatibility question before purchase

CoolingWizard — Fri, 30 Sep 2022 19:18:34 GMT

Yes you are correct, but the Nest Learning thermostat needs the 12v from the Heat Link to power it.