Z-one Relay 4 Zone Valve Control HS120Plus A stylish contemporary design with

A stylish contemporary design with intuitive selectable interfaces make the Optima S thermostat the modern multi-stage controller for all types of HVAC systems

Item #3: SH-29 thru SH-36

The ZSR103 interfaces with low voltage thermostats

Item #4: SH-7 & SH-10

Z-one Relay 4 Zone Valve Control HS120Plus A stylish contemporary design withRelay (multi zone) The ZVR series is a multi zone valve relay and boiler operating control for multiple zone hydronic heating systems. The ZVR series interfaces with low voltage thermostats or any other low voltage controllers having a switching action. The ZVR series controls up to 3, 4, 5 or 6 zones, depending on model selected. In addition, a system circulator pump and secondary pump is turned on whenever any zone calls for heat. LED indicators