Newbie

nomis21

Hi hoping to find some answers, looking to replace my manual trvs with smart tado trvs. I have purchased 3 tado smart trvs with a bridge. I have currently have a nest wall thermostat and a bit confused! Which thermostats calls for heat from the boiler, the wall thermostat or rad thermostats? Plan to put smart rad thermostats on all radiators (I have 8) plus two towel rails. Do I need the tado wall thermostat or will they work from the nest? Does the wall thermostat have to be set higher than the rad thermostats so the boiler can supply the heat? Confused how the system works.