GRUNDFOS - 3 Speed Pumps CAST IRON UPS 43-100F 230 3-speed, 1/2 HP, flanged housing - 95906637

The Grundfos UPS43-100F (MPN 95906637) is a heavy-duty three-speed cast iron circulator pump engineered for commercial hydronic heating, chilled water, and HVAC circulation systems. Powered by a 230V single-phase motor with 1/2 HP output, this maintenance-free wet rotor circulator delivers dependable performance with flow rates up to 60 GPM while allowing installers to select one of three operating speeds to match system demand. Its rugged cast iron housing, corrosion-resistant composite impeller, and water-lubricated bearing system ensure long service life with quiet operation. The UPS43-100F is an excellent choice for commercial boiler systems, radiant heating, fan coil units, and primary/secondary hydronic pumping applications.

Cross References

• Grundfos — 95906637
• Grundfos — UPS43-100F
• Bell & Gossett — NRF-36 / NRF-45 / PL-45 / PL-50 (commonly referenced equivalents)
• Taco — 1400-40 / 1400-60 / 2400-40 / 2400-60 (commonly referenced equivalents)

Usage

The Grundfos UPS43-100F is designed to circulate heated or chilled water through closed-loop hydronic systems. Typical applications include commercial boilers, radiant floor heating, fan coil units, air handlers, heat exchangers, chilled water systems, geothermal systems, and primary/secondary pumping loops. The three-speed motor allows installers to optimize pump performance for different flow requirements, improving efficiency while maintaining reliable system operation. Its wet rotor construction eliminates mechanical seals, providing quiet, maintenance-free performance for continuous-duty commercial heating and cooling applications.