OpenTherm, Zigbee thermostat (UK/EU)

Hello Everyone,

Can anyone recommend OpenTherm compatible thermostat with zigbee connection?

Setup i’m looking for is boiler (opentherm compatible) with thermostat + eTrvs in rooms - all controlled via HA (just zigbee - no WiFi if possible).

With such setup, I’d assume thermostat would keep control of boiler if HA would go down for some reason?