ZSR103 | Zone Pump Relay 3 Zone | Caleffi Size_19-1/2IN 16W power output

16W power output

and extra heavy cast iron - Dimensions: 3-inch diameter

It is sweat-compatible

making it easy to set and adjust temperature parameters as needed

ZSR103 | Zone Pump Relay 3 Zone | Caleffi Size_19-1/2IN 16W power outputCaleffi Zone Pump Relay (ZSR103) The Caleffi ZSR103 Zone Pump Relay provides precise control and sequencing for up to three zones in hydronic heating and cooling systems. Its compact design and easy to use interface make it ideal for both residential and commercial applications. Key Features: Controls up to three zones independently Adjustable time delays for pump sequencing LED indicators for clear status monitoring Built in dry contacts for remote