It might not be common, but it is valid, for instance if you buy the 3 zone kit: https://www.draytoncontrols.co.uk/products/Smart-Heating/Wiser/wiser-thermostat-kit-3 it doesn't come with any TRVs.
It might not be common, but it is valid, for instance if you buy the 3 zone kit:
https://www.draytoncontrols.co.uk/products/Smart-Heating/Wiser/wiser-thermostat-kit-3
it doesn't come with any TRVs.