This is an 8 Zone wireless central wiring centre is compatible with wireless thermostats. It can control any actuator or valve with a 230V signal. At the same time it offers the ability to operate a boiler and other heat sources; through a volt free output with changeover contacts, which gives you both a heat ON signal and heat OFF signal. Additional outputs designed for use with hot water underfloor heating systems are also included as standard. These are the pump and valve outputs which would normally operate a manifold pump or a manifold valve. The H/W output which is used to send a hot water ON and hot water OFF signal. Any output which is not needed can be ignore.