Circulating Pump-Grundfos UPS 26-99 FC is the standard by which all other circulating pumps are measured. The UPS26-99FC comes with 3 speed speed section to optimize your flow rate and is built from cast iron. It comes with a built in check valve to prevent thermosiponing and back flow. This pumps versatility and energy efficiency allow it to be used in most hydronic residential and commercial applications from solar thermal, heat pumps and radiant floor heating. The wet rotary design makes this pump virtually silent. 1/6 HP Hydraulic Work HorseTechnical Specifications of Grundfos UPS26-99FC PN 52722513Voltage: 208-240V;Amperage at Speed 1: 0.7 Amps;Amperage at Speed 2: 0.8Amps;Amperage at Speed 3: 0.9 Amps;Hertz: 60 Hz;Phase: 1;Watts at Speed 1: 150W;Watts at Speed 2: 179W;Watts at Speed 3: 196W;Max Pressure: 145 psi;Max Temperature: 230F;Min Temperature: 36F;Flow Range: 0-33 GPM;Head Range: 0-29 ft;Horse Power: 1/6HP;Body: Cast IronConnections: Flanged 3/4", 1, 1-1/4 Not Included