The Taco 0012-SF4-1 is a stainless steel 00 Series priority zoning circulator that integrates a switching relay, transformer and priority switch directly on the PC board. It allows one zone to take priority and run alone when activated while simplifying wiring for adding a zone or indirect hot water heater. The unit fits 1-1/2in to 2in piping with 2in high-velocity flanges and works with standard 2-wire thermostats or aquastats.

• Stainless steel body with 2in high velocity flanges for 1-1/2in to 2in pipe
• Priority zoning circulator with built-in transformer, relay and priority switch
• 115VAC, 1 phase, 8A max with low and high voltage terminal strips
• Compatible with other circulators or zone valves; ideal for indirect water heaters or added zones
• Optional IFC not included; UL listed, 100% factory tested, made in USA