The UP15-18 is the perfect pump for domestic hot water recirculation. Provides flows up to 9 GPM and head just below 14. With sweat connections. The pump is of the canned rotor type, i.e. pump and motor form an integral unit without shaft seal and with only two gaskets for sealing. The bearings are lubricated by the pumped liquid. The motor is a 1-phase motor. No additional motor protection is required.