Product Overview
The Grundfos UPS 15-55 SUC model 59896781 is a three-speed stainless steel wet-rotor circulator for compatible water-circulation systems. Three selectable speed settings allow the installer to adjust pump output to better match the loop’s calculated flow and head requirements rather than relying on one fixed operating range. The stainless steel housing and union connection format support applications where the complete system documentation permits this pump construction.
Confirmed hydraulic data lists a rated flow of 11.1 GPM, maximum flow of 25.1 GPM, rated head of 8.042 ft, and maximum head of 18.05 ft. These values represent separate points on the performance curve. Select the speed setting from the actual system resistance, pipe length, diameter, valves, fittings, temperature, and required circulation rate.
The pump includes a built-in isolating and non-return valve configuration identified in the confirmed specifications. It operates on 115V single-phase power, with current draw ranging from 0.53A to 0.75A by speed. Replacement references listed for this model include 59896225, 59896778, and 59896246; confirm the union connection, hydraulic duty, and electrical data before substitution.
Key Features:
- Three-speed stainless steel circulator pump
- Wet-rotor operating design
- Selectable output for system balancing
- Built-in isolating and non-return valve configuration
- 1-1/4 in. NPSM stainless steel union connection
- 115V single-phase operation
- Impedance-protected motor
Common Uses:
- Compatible hot-water circulation systems
- Water loops requiring selectable pump speeds
- Replacement of a matching stainless steel union circulator
- Residential and light system-balancing applications
Technical Specifications:
- Model: UPS 15-55 SUC
- Product Number: 59896781
- Speed Settings: Three
- Voltage: 115V, 60 Hz
- Maximum Power Input: 87W
- Current by Speed: 0.53A / 0.69A / 0.75A
- Rated Flow: 11.1 GPM
- Maximum Flow: 25.1 GPM
- Rated Head: 8.042 ft
- Maximum Head: 18.05 ft
- Connection: 1-1/4 in. NPSM stainless steel union
- Port-to-Port Length: 5-15/16 in.
- Maximum Operating Pressure: 145.04 PSI
- Liquid Temperature Range: 35.6-203°F
- Timer Temperature Note: Maximum 150°F when equipped with a timer
- Approvals: UL and CSA
Dimensions and Weight:
- Net Weight: 4.94 lb
- Gross Weight: 5.79 lb
Installation and Sizing Notes:
Choose the speed that meets the required flow at system head without excessive velocity or noise. Confirm union compatibility, valve arrangement, liquid temperature, pressure, electrical supply, pump orientation, and air removal. Follow the linked Grundfos documentation.
FAQ:
How many speed settings are available?
Three selectable speeds are confirmed.
What is the confirmed maximum flow?
The confirmed maximum flow is 25.1 GPM at the applicable pump-curve point.
What temperature limit applies with a timer?
The confirmed data states a 150°F maximum liquid temperature when equipped with a timer.
What replacement references are listed?
59896225, 59896778, and 59896246; verify the complete application before substitution.
Why Buy From Big Frog Supply?
Big Frog Supply provides clear technical information, helpful support, and convenient online ordering for circulator pumps and water-circulation systems.
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