The Taco 006-E3 1" ECM Circulator Pump is a high-efficiency pump designed for hydronic heating, cooling, and domestic hot water recirculation systems. Featuring advanced ECM (Electronically Commutated Motor) technology, it automatically adjusts speed to match system demand, reducing energy consumption while maintaining optimal flow. https://www.partshnc.com/006-e3-taco-1-ecm-circulator-pump