ClimateMaster 24B0003N25 Pump

The ClimateMaster 24B0003N25 is a high-performance Grundfos UP26-99F 3-speed circulator pump engineered for demanding geothermal closed-loop systems and water-source heat pump applications. Operating at 277V, this heavy-duty wet rotor circulator features a cast iron housing designed for longevity in hydronic heating and cooling circuits. As a veteran-grade HVAC replacement part, it utilizes a canned rotor design where the pump and motor form an integral unit, eliminating the need for a shaft seal and ensuring near-silent operation in sound-sensitive installations. Its maintenance-free construction includes internally lubricated bearings, cooled by the pumped fluid, to prevent overheating during continuous duty cycles. This specific 277 volt pump is a critical component for maintaining secondary loop flow rates, supporting high-head requirements up to 29 feet. For contractors handling ClimateMaster heat pump repair, verifying the voltage and flange orientation is essential to ensure a drop-in OEM pump replacement that preserves system hydraulics and operational efficiency.

• High-Head Performance: Capable of delivering up to 33 GPM or 29 feet of head pressure, making it ideal for large residential and commercial geothermal loops.
• Quiet Operation: The wet rotor design and integral motor unit minimize vibration and mechanical noise within the mechanical room.
• Maintenance-Free Reliability: Self-lubricating bearings and a corrosion-resistant non-metallic impeller reduce the need for routine servicing.
• OEM Compatibility: Specifically sourced as a direct ClimateMaster replacement part to ensure seamless integration with existing control boards and piping.

Is the UP26-99F 277V interchangeable with the 230V model?
No. While the physical dimensions and hydraulic curves may be similar, the motor windings are rated specifically for 277V high voltage circuits. Installing this on a lower voltage source will result in failure or inefficient operation.

Does this pump require external lubrication?
No, this is a wet rotor circulator. The system fluid provides all necessary cooling and lubrication for the internal bearings during operation.

Are the flanges included with the 24B0003N25?
This model typically ships with flange gaskets, but the cast iron pump flanges themselves are usually sold separately to match your specific pipe diameter (3/4" to 1-1/2").

This item is not eligible for free shipping.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.