An ten zone floor heating wiring centre for use in systems having hard wired room thermostats. In addition to providing a structured wiring system for zone thermostats and associated thermal actuators, the wiring centre also incorporates two voltage free heat demand relays that are activated when one or more zones call for heat. The two relay solution allows for separate control of a floor heating zone pump and a boiler. With this arrangement, the boiler may by used for normal radiator heating and hot water service provision, without the need for external relays. Includes 230v to 24v transformer.