Grundfos 52722512 UPS 26-99 FC Circulator Pump

Product Overview

The Grundfos 52722512 UPS 26-99 FC is a high-capacity, three-speed cast iron circulator pump engineered for large residential hydronic systems and light-commercial heating applications. Delivering up to 33 GPM of flow and 28.87 ft of head, it is ideal for multi-zone heating, radiant floor systems, indirect water heaters, and high-demand recirculation loops. Premium components such as a ceramic shaft, carbon axial bearing, and stainless steel rotor can ensure long-term reliability. Built-in isolating and non-return valves streamline installation and service.

Features & Benefits

• Three-speed motor for precise hydraulic control
• Ceramic shaft and radial bearings for long service life
• Carbon axial bearing for smooth, quiet operation
• Stainless steel rotor can and bearing plate for corrosion resistance
• Corrosion-resistant PES composite impeller
• Durable cast iron pump housing for closed hydronic systems
• Built-in isolating and non-return valves
• UL and CSA listed for North American compliance
• Handles liquid temperatures from 35.6°F to 230°F

Specifications

Technical Performance
Speed options: 3
Maximum flow: 33 US GPM
Maximum head: 28.87 ft
Approvals: UL, CSA
Valve type: Built-in isolating and non-return valves

Materials
Pump housing: Cast iron (EN-JL1030 / ASTM 30B)
Impeller: Composite PES
Bearings: Ceramic shaft, carbon axial
Rotor can / bearing plate: Stainless steel

Installation Requirements
Max ambient temperature: 104°F (176°F with matching liquid temperature)
Maximum operating pressure: 145.04 psi
Connection type: Cast-iron flange
Flange standard: USA oval, 2-bolt
Pressure rating: PN 10
Port-to-port length: 6.5 in

Liquid Handling
Pumped liquid: Water
Temperature range: 35.6°F – 230°F
Selected rating temperature: 140°F
Liquid density: 61.35 lb/ft³

Electrical Details
Voltage: 1 x 115V
Frequency: 60 Hz
Max power input: 197 W
Current draw: 1.3A (speed 1), 1.5A (speed 2), 1.8A (speed 3)
Capacitor: 20 μF / 180 V
Poles: 2
Insulation class: F
Motor protection: Internal thermal

General Information
Gross weight: 10.3 lb
Country of origin: United States
HTS code: 8413.70.00.21

Installation Tips

• Flush system piping prior to installation to protect bearings.
• Install with the motor shaft level for optimal performance.
• Use proper USA oval flanges for a correct fit.
• Confirm operating pressure and water temperature are within limits.
• Adjust speed settings to match system demand and improve efficiency.

Frequently Asked Questions

Is the UPS 26-99 FC suitable for large radiant heating systems?
Yes, its high-flow and high-head capabilities make it suitable for multi-zone radiant floor systems.

Does this pump include isolating valves?
Yes, integrated isolating and non-return valves simplify service work.

Can this replace older 26-99 circulators?
Yes, it matches the original flange style, length, and electrical configuration.

What power supply is required?
It operates on a 115V single-phase power source.

Is this pump suitable for potable water?
No, cast iron pumps are intended for closed hydronic systems only.