Grundfos UPS 15-55 SUC — 59896781 Stainless-Steel Circulator Pump with Union Connections

Grundfos UPS 15-55 SUC (59896781) — Stainless-Steel Circulator Pump

The Grundfos UPS 15-55 SUC is a three-speed, stainless-steel circulator pump designed for hot-water recirculation, radiant heating, and closed-loop systems. With corrosion-resistant construction, quiet performance, and flexible speed control, it ensures dependable flow and long service life in both residential and light-commercial applications. 

Key Features & Benefits

• Three-speed motor for precise system balancing and performance optimization
• Stainless-steel housing for potable-water and high-corrosion environments
• Maintenance-free, wet-rotor motor with quiet operation
• Union connections for simple installation and service
• Thermal protection and overload safety for long-term reliability

Applications

• Domestic hot-water recirculation
• Radiant floor and baseboard heating systems
• Cooling and air-conditioning loops
• Potable-water circulation and closed-loop systems

Specifications

Engineered for quiet, efficient circulation — the Grundfos UPS 15-55 SUC delivers stainless-steel performance you can trust for years to come.

This item replaces: 59896225, 59896778, 59896246

Electrical data
Power input in speed 1 0.07778 HP
Power input in speed 2 77 W
Max. power input 87 W
Main frequency 60 Hz
Rated voltage 1 x 115 V
Current in speed 1 0.53 A
Current in speed 2 0.69 A
Current in speed 3 0.75 A
Capacitor size - run 10 µF/180 V
Number of poles 2
Insulation class (IEC 85) F
Ex-protection standard CONTACT
Thermal protec Impedance protected

Technical
Speed Number 3
Rated flow 11.1 US gpm
Max flow 25.1 US gpm
Rated head 8.042 ft
Maximum head 18.05 ft
Approvals UL, CSA
Y = pump with built-in isolating and non-return valves Y

Installation
Maximum ambient temperature 104 °F
Ambient max at 176°F liquid 176 °F
Maximum operating pressure 145.04 psi
Type of connection 1 1/4" NPSM
S.S. Union Pipe connection 1 1/4" NPSM
Pressure rating for connection PN 10
Port-to-port length 5 15/16 in

Liquid
Pumped liquid Water
Liquid temperature range 35.6 .. 203 °F Note that when equipped with a timer the Max Liquid temperature is 150 °F
Selected liquid temperature 140 °F
Density 61.35 lb/ft³

Net weight 4.94 lb
Gross weight 5.79 lb