006e3 ECM High-Efficiency Hot Water Circulator The 00e Perfect For Any Instant Hot Water System The 00e Series® — 006e3® ECM High-Efficiency Hot Water Circulator is an infinitely variable fixed speed, high-efficiency wet rotor Circulator with an ECM permanent magnet motor. It is perfect for hot water recirculation and hydronic heating applications. With 3 easy settings, the 006e3® ECM High-Efficiency Hot Water Circulator delivers performance, reliability and ease of installation that made the 00® famous.