RCP-96 Grundfos Recirculation Pump for Tankless Water HeatersThe 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!NOT SUITABLE FOR APPLICATIONS WITH NO RETURN LINE! Model RCP-96 Includes:UPS15-55SFC pumpTimer3/4" Aquastat Heat Sensing UnitLine CordDialectric 3/4" Ball Valve Isolation Flanges UPS15-55SFC Specifications:Flow range: 0-25 U.S. gpmHead range: 0-18 feetMotors: 2-pole, single-phaseMax. liquid temperature: 230 °F (110 °C)Min. liquid temperature: 36 °F (2 °C)Max. system pressure: 145 psi * This pump may not be suitable for all models of tankless water heaters. Check with heater manufacturer for appropriate re-circ pump sizing. Heater warranty may be affected by installing a re-circ loop.