Caleffi ZVR103 Relay 323613-751 high-tension spring

high-tension spring

4 Cv valve for hot water

maintaining footprint and piping alignment

reducing the risk of thermal failure or arcing

Caleffi ZVR103 Relay 323613-751 high-tension springThe Caleffi ZVR103 is a high performance 3 zone valve relay designed for professional contractors managing multi zone hydronic heating systems. Engineered for seamless integration, the ZVR103 serves as a direct technical replacement for the HPZC103, providing a robust interface between low voltage 2, 3, and 4 wire thermostats and boiler equipment. This hydronic zone valve controller features a standard 40 VA transformer, which is field expandable to