Replacing a Bosch FR120 Thermostat with a NEST 3rd gen

[jmclean]

Hi there

I am looking to replace my existing Bosch FR120 Thermostat with a NEST Gen 3 device.  

The current system is a two wire 24vDC device.  

From the forums available I get mixed views on whether this is possible or what is required to make it work.

Anyone replaced one of these devices and what was required?

[Jake]

Hey there,

I wanted to follow up and see if I could be of any help. I found an article with more details on compatibility. Please let me know if you are still having any trouble from here, as I would be happy to take a closer look and assist you further. 

Best regards,
Jake

[jmclean]

Hi there,  thanks for reaching out.  I found this blog recently that I was hoping may be part of the answer here.
https://carly.be/using-the-nest-thermostat-with-a-modulating-junckers-boiler-2/ As this is pretty much what I am trying to achieve, without the use of the NEST HeatLink device - as it looks like this is used in Europe / UK for NEST installations.

[OannaCG]

Hi there! Please check the compatibility here: https://goo.gle/2QRgNWR . Also, please take into account the fact that our thermostat can't function without its Heat Link. Please let me know if there are any questions left.

[LarisaL]

Hi there! I just wanted to check in with you. Did you see the message from my colleague?

Many thanks, Larisa.

[jmclean]

Hi there

Yes I did. However, from what I have read  the heat link device is used in Europe and not in Australia. 

[LarisaL]

Hi @jmclean. Only the European version of the Nest thermostat, which has a Heat Link, is compatible with OpenTherm boilers. You can find more information about the OpenTherm functionality with Nest thermostats here. But keep in mind that Australia is not a supported country for Nest thermostats.

[LarisaL]

Hi there, I just wanted to check in with you. Did you see my previous message?

[OannaCG]

Hey there, since we haven't heard from you for a couple of days, we'll close this conversation for now. If you still need help, let us know so we can continue. Thanks!