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cjr-
OK, you can zone which is the most expensive really as it involves 3 way valves and stats on each floor.
Smart Stats will report to the hub and you can set up the heating via the app.
To be honest, the easy and cheap way is just standard TRV's on each rad and set them each to maintain room temperature.
Mr_Sworld
Smart TMV's on the rads or a dumb zone heating system.