Evohome supports different type of systems. You may have underfloor in the living room and radiators in the rooms. For each room you need to select the right system
Rooms equipped with radiators can be controlled using wireless radiator controllers. Radiators must have compatible thermostatic radiator valves for direct mount of the controllers.
UNDERFLOOR WITH MANIFOLD
If your underfloor system includes a manifold, a controller must be mounted to obtain perfect comfort in each room through optimal control over the thermal actuators.
UNDERFLOOR SINGLE ZONE VALVE
If your underfloor system includes a single zone valve to open/close the water supply and there are no thermal actuators for additional zoning.
In case you need to control an electrical radiator using an on/off relay. Please look carefully that relay specifications are compatible with electrical load.
If the house is equipped with zone valves to control different floors or areas.