Product Overview
The Grundfos UPS 15-58 FC model 59896341 is a three-speed cast iron wet-rotor circulator for compatible closed hydronic heating and cooling systems. Its selectable speeds allow the installer to match pump output more closely to the loop’s calculated flow and head requirements, supporting system balancing across radiant-floor, baseboard, fan-coil, snow-melt, and other closed-loop applications.
The FC configuration uses two-bolt cast iron flange connections and includes an internal non-return valve arrangement identified in the confirmed specifications. Hydraulic data lists a rated flow of 8.5 GPM, maximum flow of 17.2 GPM, rated head of 10.47 ft, and maximum head of 19.36 ft. These values occur at different points on the curve, so pump selection and speed setting must be based on the actual system resistance.
Because this model has a cast iron housing, it should be selected for compatible closed-loop service rather than open potable-water circulation unless the manufacturer documentation for the exact installation states otherwise. Replacement references include HMCIR01, 59896248, 59896178, 8056173, and 59896155; confirm flange spacing, system duty, and electrical requirements before substitution.
Key Features:
- Three-speed cast iron circulator
- For compatible closed heating and cooling loops
- Wet-rotor, maintenance-free operating design
- Two-bolt cast iron flange connections
- Built-in non-return valve configuration
- 115V single-phase operation
- Impedance-protected motor
Common Uses:
- Hydronic heating loops
- Radiant-floor and baseboard systems
- Fan-coil and compatible cooling loops
- Snow-melt circulation
- Replacement of a matching flanged circulator
Technical Specifications:
- Model: UPS 15-58 FC
- Product Number: 59896341
- Speed Settings: Three
- Voltage: 115V, 60 Hz
- Maximum Power Input: 87W
- Current by Speed: 0.55A / 0.66A / 0.75A
- Rated Flow: 8.5 GPM
- Maximum Flow: 17.2 GPM
- Rated Head: 10.47 ft
- Maximum Head: 19.36 ft
- Connection: Two-bolt cast iron flange
- Port-to-Port Length: 6.54 in.
- Maximum Operating Pressure: 145.04 PSI
- Liquid Temperature Range: 35.6-230°F
- Approvals: UL and CSA
Dimensions and Weight:
- Net Weight: 6.26 lb
- Gross Weight: 6.75 lb
Installation and Sizing Notes:
Calculate the loop flow and head loss, then select the appropriate speed. Confirm flange spacing, system material, liquid temperature, pressure, electrical supply, pump orientation, air elimination, and check-valve requirements. Follow the linked Grundfos documents.
FAQ:
Is this pump intended for potable-water recirculation?
The cast iron housing is intended for compatible closed hydronic systems; do not assume approval for open potable-water service.
What is the confirmed maximum flow?
The confirmed maximum flow is 17.2 GPM.
Does the FC model include a check valve?
The confirmed specifications identify a built-in non-return valve configuration.
Which replacement references are listed?
HMCIR01, 59896248, 59896178, 8056173, and 59896155; confirm compatibility before substitution.
Why Buy From Big Frog Supply?
Big Frog Supply provides clear technical information, helpful support, and convenient online ordering for hydronic circulators and heating-system components.
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