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Is your nest just your wall thermostat that sends a signal to your heating controller? I'm not 100% sure but you might be able to get the Tado extension kit (not the thermostat) to replace your existing controller then get the TRVs and set those up so they speak to the extension kit. The nest then might just continue to act as your wall thermostat. Tado is compatible with Google Home so you might then be able to control it all through there.
The Tado community forum might be a good place to get a better answer though.
Noob question.... And in sure it's been asked and answered before on here but I can't find.
I have a Google nest thermostat. Can I just get a pack of tado radiator thermostats and connect to nest or do I need the tado smart hub thing?