UP26-96SF 1/6 Horsepower Circulator PumpUP26 96SF 1 6 Horsepower Recirculator Pump The Grundfos UP26 99F is a cast iron circulator pump (Grundfos SKU# 52722355), primarily used in closed loop heating applications. The high head high flow characteristics of the Grundfos UP26 99F make it ideal for baseboard radiator heating, radiant heating, fan coils, solar, wood buring boilers and other project types. 1 6 horsepower Flow Range: 0 34 GPM, Head Range: 0 32 Feet Motors: 2 Pole, Single Phase,