Taco 0015e3 is a variable speed, high-efficiency wet rotor circulator with an ECM permanent magnet motor. It's ideal for hydronic systems zoned with circulators or zone valves. With 3 easy settings, the 0015e3 delivers performance, reliability and ease of installation that made the 00 famous. Install it, forget it! The features you want, and more! BIO Barrier protects the pump from system contaminants SureStart automatic unblocking and air purging mode High-efficiency ECM motor uses up to 85% less electricity IFC (Integral Flow Check) is included 3 easy settings: LOW (5 ft. head), MEDIUM (10 ft. head), HIGH (18 ft. head); 16 gpm max flow Dual electrical knockouts and 6" stranded wire leads for no-fumble wiring Double insulated; no ground wire needed Whisper quiet operation.