...if a combi boiler is installed with a wireless CH thermostat controlling the boiler for radiators...and you want to add a UFH pumped distribution manifold to the radiator circuit.
Would it make sense to have a second controller for the combi boiler to give the UFH it's own temp/time parameters to deal with the longer heat up times? This second thermostat would then simultaneously switch the UFH circ pump as well as make the CH circuit on the boiler. I guess you would need to add a zone valve to both rad and ufh circuits too.
(UFH downstairs in 3 rooms, rads upstairs. CH rad thermostat would probably by in ground floor hallway, UFH thermostat in one of the UFH heated rooms)