That thermostat is sure big and ugly. It looks like ambisense is another smart heating product and is expandable and not compatible with vsmart which I think it replaces. Have to do more research on which one to go for.
This might be an option
Further research and seem Vsmart does not support heating zones :( I guess I can use those old fashion manual radiator thermostats instead.
I don't think vsmart will do zoning. Might be wrong though. Ask Vaillant tech support they are usually helpful (y)
Sounds like an idea however I don’t know haven’t looked into it myself but I am sure there are some 3rd party products that can if your boiler manufacturer doesn’t. I seem to have the minimum in that respect - radiators balanced and all with those turnable radiator valves