Grundfos 95906637 Cast Iron Circulator Pump - UPS43-100F 3-Speed 230V

The Grundfos UPS43-100F is a high-performance, three-speed cast iron circulator pump designed for residential and commercial heating, air-conditioning, and hydronic systems. This canned rotor pump features a 1/3 HP motor operating on 208-230V single-phase power, delivering reliable performance across a wide range of applications including closed-loop heating and cooling systems, central heating, and district heating installations.

Key Features:

• Three-speed motor (Low/Medium/High) with adjustable flow rates up to 65 GPM for application flexibility
• Maximum head of 31 feet with operating pressure up to 145 PSI
• Cast iron construction with stainless steel impeller, bearing plate, and rotor for durability
• Canned rotor design eliminates shaft seals—only two gaskets required for sealing
• Whisper-quiet, maintenance-free operation with self-lubricating bearings
• Flanged connection design (GF40/43) with 8.5-inch port-to-port length
• Power LED indicator and quick-connect terminals for easy installation
• Handles liquid temperatures from 36°F to 230°F
• Suitable for pumping up to 50/50 glycol and water mix solutions
• cETLus Listed and made in the USA

This SuperBrute series pump offers cross-compatibility with Taco, Bell & Gossett, and Armstrong circulators at comparable speed settings. The pump includes thermal overload protection and features a 24-month manufacturer warranty from date of manufacture or 18 months from installation date. Note: Requires 1-1/2" cast iron flange set for flanged mounting applications (sold separately).