Grundfos UPS43-100SF (95906638) Pump, Circulator 115V 1/2 HP 3-Speed – Stainless Steel

Condition: New

The Grundfos UPS43-100SF (95906639) Circulator Pump is a high-efficiency, stainless steel, 3-speed pump designed for demanding hydronic heating, potable water, and HVAC applications. Operating at 208-230V, single-phase, 1/2 HP, it provides up to 65 GPM flow and a maximum head of 30.84 feet. Engineered for durability and efficiency, this Class H thermally protected pump is capable of handling liquid temperatures up to 230°F, making it ideal for high-temperature heating systems. With a 2-bolt stainless steel flange connection, integrated thermal protection, and internal insulation, this circulator pump ensures long-lasting, reliable performance.

Features

• Versatile 3-Speed Motor: Adjusts to system demands for optimized performance.
• High Flow & Head Capacity: Handles up to 65 GPM with a 30.84-foot max head.
• Durable Stainless Steel Construction: EN 1.4308 / ASTM A351-CF8 stainless steel housing ensures corrosion resistance.
• Impeller Material: High-strength PES + 30% GF composite for extended durability.
• Wide Temperature Range: Operates in liquid temperatures from 35.6°F to 230°F.
• High-Pressure Rating: Maximum system pressure of 145 PSI (PN 10 rated).
• Energy Efficient: Low power input (370W max) reduces energy costs.
• Internal Thermal Protection: Prevents overheating and prolongs motor life.
• 2-Bolt Flange Connection: Stainless steel flanges ensure secure installation.
• Insulation Class H: Designed for high-heat applications.
• Compact & Lightweight: Weighs 16.3 lbs, with a port-to-port length of 8 9/16 inches for easy installation.

Applications

This Grundfos UPS43-100SF (95906639) circulator pump is designed for a variety of HVAC and plumbing systems, including:

• Hydronic Heating Systems – Radiant floor heating, boiler circulation, and baseboard heaters.
• Potable Water Recirculation – Stainless steel housing ensures safety for domestic water use.
• HVAC & Chilled Water Systems – Circulating hot or chilled water in commercial and residential buildings.
• Solar Heating & Geothermal Systems – Handles high-temperature solar and renewable energy applications.
• Industrial Liquid Circulation – Pumps water in high-pressure and temperature-controlled systems.

Specifications

General Information

• Brand: Grundfos
• Model: UPS43-100SF
• Part Number: 95906639
• Country of Origin: USA

Hydraulic Performance

• Speed Options: 3-Speed
• Rated Flow: 32.5 GPM
• Max Flow: 65 GPM
• Rated Head: 22.33 ft
• Max Head: 30.84 ft

Material & Construction

• Pump Housing: Stainless Steel (EN 1.4308 / ASTM A351-CF8)
• Impeller: Composite (PES + 30% GF)

Installation Data

• Port-to-Port Length: 8 9/16 inches
• Max Ambient Temperature: 104°F
• Max System Pressure: 145 PSI (PN 10 rated)
• Connection Type: 2-Bolt Stainless Steel Flange

Electrical Data

• Power Supply: 208-230V, Single-Phase
• Max Power Input: 370W (1/2 HP equivalent)
• Frequency: 60 Hz
• Current Draw:
  • Speed 1: 1.4A
  • Speed 2: 1.6A
  • Speed 3: 1.7A
• Capacitor: 10 µF / 400V
• Motor Protection: Built-in Thermal Protection
• Insulation Class: H

Cross-Referenced & Equivalent Models

This pump can replace or is compatible with:

• Grundfos UPS43-100BF (Bronze Housing, 208-230V)
• Taco 2400-50-3P (1/2 HP, 208-230V, 3-Speed Circulator)
• Bell & Gossett NRF-50 (1/2 HP, 208-230V, Stainless Steel Circulator)
• Armstrong 110223-306 S-55 Stainless Circulator Pump

Comparable Products

If the Grundfos UPS43-100SF (95906639) is unavailable, consider these alternatives:

• Taco 0013-SF3 Stainless Steel Circulator Pump (1/2 HP, 208-230V, 3-Speed)
• Bell & Gossett PL-50 Stainless Steel Circulator (1/2 HP, 208-230V)
• Wilo Star S 55 Stainless Circulator (1/2 HP, 208-230V)
• Armstrong 110224-306 Stainless Steel 3-Speed Pump

Related

• Grundfos high-temperature circulator pump
• 208-230V stainless steel hydronic pump
• 1/2 HP HVAC circulation pump
• High-pressure boiler circulator pump
• Energy-efficient 3-speed hot water pump
• Stainless steel potable water pump

Common Requests:

1. How to install a Grundfos UPS43-100SF (95906639) circulator pump
2. Best 3-speed circulator pumps for potable water systems
3. Grundfos UPS43-100SF vs. Taco 2400-50-3P – Which one to choose?
4. Troubleshooting a Grundfos 208-230V circulator pump not working
5. Where to buy a Grundfos UPS43-100SF replacement pump

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