ClimateMaster 24B0004N04 Pump

The ClimateMaster 24B0004N04 Pump is a high-head Grundfos UP26-116U replacement circulator engineered specifically for geothermal and hydronic heat pump applications. This 230V single-speed centrifugal pump features a wet rotor design, ensuring quiet, maintenance-free operation in closed-loop systems. Built with a 1/6 HP motor pulling 1.75 amps, it delivers a maximum flow rate of 38.5 GPM and a max head of 37.5 feet, making it the standard for ClimateMaster Tranquility series units requiring precise geothermal loop circulation.

As a veteran tech knows, the UP26-116U replacement pump is often housed without the volute (cast iron body), so verify your existing housing integrity before installation. This HVAC replacement part is optimized for water or glycol-based heat transfer fluids and is critical for maintaining correct approach temperatures and preventing high-pressure trips in water-source heat pumps. When swapping this circulator pump, always ensure the motor shaft is positioned horizontally to prevent premature bearing wear and air binding within the cartridge.

Key Benefits

• Direct OEM Compatibility: Precise match for ClimateMaster 24B0004N04 and Grundfos UP26-116U specs.
• High-Head Performance: Provides up to 37.5 feet of head pressure to overcome resistance in long earth loop runs.
• Wet Rotor Technology: Eliminates the need for mechanical seals, reducing leak points and operational noise.
• Reliable Heat Exchange: Maintains the constant flow required for efficient thermal transfer in radiant heating.

Common Questions

Is the volute/housing included with the 24B0004N04?
Most variations of the 24B0004N04 (UP26-116U) are supplied as the motor and cartridge assembly only. You must reuse your existing cast iron or bronze volute or purchase one separately if the original is cracked or heavily scaled.

Can I use this pump in an open-loop system?
This specific model features a cast iron stator housing intended for closed-loop hydronic or geothermal systems. For open-loop or potable water applications, a bronze or stainless steel version is required to prevent corrosion.

What are the electrical requirements for this replacement?
This is a 208-230V, single-phase unit. Ensure your control board or contactor is providing the correct voltage, as running this on 115V will lead to motor failure.

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.