GRUNDFOS - 3 Speed Pumps - CAST IRON UPS 43-100F 115 3-speed, 1/2 HP, flanged housing - 95906636

The Grundfos UPS43-100F (MPN 95906636) is a heavy-duty three-speed cast iron circulator pump engineered for commercial hydronic heating, chilled water, and HVAC circulation systems. Powered by a 115V single-phase motor with a 1/2 HP output, this maintenance-free wet rotor circulator delivers dependable performance with flow rates up to 65 GPM while allowing installers to select one of three operating speeds to match system requirements. Its durable cast iron housing, corrosion-resistant composite impeller, and ceramic bearing system provide long service life with quiet operation. Designed for continuous-duty operation, the UPS43-100F is ideal for commercial boiler systems, radiant heating, geothermal, fan coil units, and primary/secondary pumping applications.

Cross References

• Grundfos — 95906636
• Grundfos — UPS43-100F
• Bell & Gossett — Series PL-45 / PL-50 (commonly referenced equivalent)
• Taco — 1400 Series (similar application class)

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, chilled water systems, geothermal systems, fan coil units, heat exchangers, district heating, and primary/secondary pumping loops. The three-speed motor allows installers to optimize flow and head pressure to meet varying system demands while reducing operating costs. Its maintenance-free wet rotor construction eliminates mechanical seals, resulting in quiet operation and long service life with minimal maintenance.