Heatmiser 8 Zone Wiring Centre 230V UH8 works perfectly with 4 channel 230V time clocks and 230V thermostats. Suitable to work with 230V room thermostat. Controls up to 8 zones. UH8 contains 2 heating time channels. Extra 2 channel connections are provided for hot water control as well as for auxiliary devices. Easy to control radiation zones.