SR503-5 3 Zone Switching Relay w/ Priority Tankless Service Valve 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

Easy-Off w/ an adjustable wrench

Designed for durability and consistent performance

BTH Ultra/ MINI ULTRA

SR503-5 3 Zone Switching Relay w/ Priority Tankless Service Valve A stylish contemporary design withThe Taco Switching Relay is the best choice for all your zoning needs, with advanced timer and boiler functions, external diagnostic lights, switchable priority and contracctor friendly PC board layouts. Combined with the time proven reliability of the 00 family of circulators and thermostats, total system integration is achieved.