Hello enako,
please contact the support from "Nest" to get some information about the connection.
We don´t sell this system so I can´t give you any information about that.
You can use the Vitoconnect at your heatpump. Information about the Vitoconnect you can find under the following link:
http://www.viessmann.com/com/en/vitoconnect.html
Greetings °be
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