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Mix and match systems are fine and it’s probably what you’ll end up with if you had a dumb timer / thermostat combo to start with - my suggestion is for CJRs context of what to do with an existing dumb system that has no thermostat.
I think Tado are as confused as everyone else as to what their thermostat is actually for. As soon as you add one smart TRV the thermostat stops making sense and should be replaced with another or more smart TRVs. Their survey they sent out the other week alludes to this.
I’m braking Howard’s Rule. Smart thermostat in the living room where we spend all our time, one smart TRV in the bedroom on its own schedule to stop us cooking when the heating comes on at 6am, then off during the day, little boost before bed. Works great.
Not looking forward to when tado get bought / go bust, but maybe we’ll have moved by then. Or it’s already malfunctioned and we’ve been cooked.