The Taco 0012-F4-1 is a cast iron priority zoning circulator that combines the 00 series circulator with an integrated switching relay package. It features low and high voltage terminal strips, a built-in priority switch, and simplified wiring directly to the PC board. This model is used in hydronic heating systems to prioritize a specific zone such as an indirect water heater or to add a zone to an existing system.

• Cast iron construction with 2" flanges
• Priority zoning circulator with built-in transformer, relay and priority switch
• 115 VAC, 1 phase, 8 A max, 24 VAC thermostat compatibility
• Ideal for adding a zone or indirect domestic hot water heater
• Optional integral flow check (IFC) available
• UL listed, 100% factory tested, made in USA