The Grundfos UPS15-58FRC circulator pump (59896343) model incorporates a three speed motor for increased versatility, a built-in check valve and a rotated flange designed for installation versatility. Wet rotor design allows it to be virtually silent while operating. The pump also saves power with pre-program usage times.The Grundfos UPS15-58FRC is for Closed systems with Maximum liquid temperature 230 F.Grundfos UPS15-58FRC Features Built-in motor protection for longer life and better performance. Suitable for a wide range of applications, including radiant heating, hydronic heating, fan coil heating, solar and other system types. Whisper-quiet operation for sound sensitive installations. 0-17 gpm from 0-19.5 foot heat 1/25 hp; 2 pole, single phase, 115 volt motor 145 psi maximum working pressure GF 15/26 connection type; 230 F max fluid temperature Includes check valve Applications: Closed loop radiant heating & snow melting systems. Baseboard/Radiator/Fan coil heating and other hydronic heating applications. Features: Built-in motor protection for longer life and better performance. Suitable for a wide range of applications, including radiant heating, hydronic heating, fan coil heating, solar and other system types. Whisper-quiet operation for sound sensitive installations. Includes (2) Gaskets (O-rings). UL/CSA listed. Technical Specifications: Voltage: 115V Amperage at Speed 1: 0.55 Amps Amperage at Speed 2: 0.66 Amps Amperage at Speed 3: 0.75 Amps Hertz: 60 Hz Phase: 1 Watts at Speed 1: 60W Watts at Speed 2: 80W Watts at Speed 3: 87W Max Pressure: 145 psi Max Temperature: 230F Min Temperature: 36F Flow Range: 0-17 GPM Head Range: 0-19.5 ft Horse Power: 1/25HP Body: Cast Iron Connections: Flanged 1/2", 3/4", 1", 1-1/4". Warranty: 3 years manufacturer's warranty.