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If you don’t have TRV’s on the Rads do that(stick danfoss ones they are the best), if yiu want control over each floor you’ll need to zone it.
Motorised values and a smart thermostat, nest won’t do multiple zones you’d needs a couple of them but a Wiser would do it you could run traditional wall mounted ones but you’d need to run cables back to the boiler far too much hassle and cost prohibited by the time you’d do it.
Smart thermostats keep getting mentioned in here, I think there pish personally, for people with too much time on there hands and a fad at Best but each to there own.
To follow up on the heating chat. If I have a combi boiler with no room stat. What’s the best way to have decent control over heating. Three floors, all used. We don’t need particularly smart stuff, but not heating a whole house unnecessarily would be nice.