UP43-75BF Grundfos 1/6 HP Recirculator Pump (52722370) The Open-system UP Series hot water recirculation pumps save you time, money, and energy, by circulating hot water through your household plumbing without wasting it down the drain. Grundfos has a recirculation that is perfect for your new home!Technical Specifications: Flow range: 0 - 45 U.S. GPMHead range: 0 - 26 FEETMotors: 2 Pole, Single Phase, 115 VoltMaximum fluid temperature: 230°F (110°C)Minimum fluid temperature: 36°F (2°C)Maximum working pressure: 145 PSIConnection: Flange - (2) 1/2" Diameter Bolt Holes