FH-WC is a connection box for use in hydronic floor heating systems supplied from a manifold. FH-WC is a wiring center for connecting thermal actuators to the room thermostats. It is provided with two potential-free relays for controlling a circulation pump and a boiler. The relays are activated when one or more thermostats require heat. FH-WC is connected to 230 VAC/50 Hz. Mounting is made easy due to the symbols printed on the screw terminals.