Are Nest Thermostats compatible with Vitodens 111-w?

Fischer

I've a Viessman Vitodens 111-w, are the nest thermostat compatible with the viesmann opentherm control?

SuperTech

The Nest thermostat doesn't work well with outdoor reset controls. With outdoor reset your best choice would be to use any other thermostat and don't use the programming.

If you want WiFi capabilities I suggest using a Honeywell Lyric thermostat.

kalex1114

Are you in Europe? European nests are suppose to work with Opentherm standard so it should work if both support it

Fischer

yes, I live in Europe. In my country, in Hungary, there is no Nest representation, so I do not know where they can help..

kalex1114

Here is a 3rd gen manual for EU installations. it goes over details on how to connect it to opentherm

https://nest.com/support/images/misc-nest-thermostat-eu/gen3-install/3rd-gen-Nest-Learning-Thermostat-Install-Guide-UK.pdf

Page 26 shows opentherm boiler wiring