The patented Taco Priority Zoning Circulator combines the reliability of the 00 circulator with the convenience and efficiency of a switching relay. With a built-in transformer, relay and priority switch, all the wiring is done directly to the PC board inside the circulator, making it ideal for adding a zone or an indirect hot water heater. Now available with integral flow check (IFC). Each zoning circulator has low and high voltage terminal strips for ease of electrical hookup, as well as a built-in priority switch. The priority switch allows the installer to choose the zone that requires the most attention and, when activated, runs only that circulator. The priority zoning circulator can be used in conjunction with other circulators or zone valves. It is ideal for indirect hot water heaters, adding another zone, zoning with circulators, and for prioritizing under-sized zones. Available in a full range of sizes from 003 - 0014.