The Nibe 524513 is an OEM Grundfos UPMGEO 25-85 180 circulation pump specifically designed for the collector (brine) circuit in Nibe ground source heat pumps. It controls fluid circulation to transfer energy from the ground loop into the evaporator.

Technical Specifications

• Manufacturer Part Number: Nibe 524513

• Pump Model: Grundfos UPMGEO 25-85 180 (OEM)

• Port-to-Port Length: 180 mm

• Port Connection: 25 mm (G 1½" thread standard)

• Maximum Head (Pressure): 8.5 m (85 dm)

• Power Supply: 1~230 V, 50 Hz

• Power Consumption: ~5 W – 87 W (high-efficiency variable speed)

• Control: Variable speed controlled via heat pump system board/firmware (PWM interface)

• Replaces Older Models: Older standard-efficiency Grundfos UPS 25-80 series pumps.

Common Compatibility

This pump is commonly found in medium to large capacity ground source units, including:

• Nibe Series: F1145, F1245, F1345, and F1355 (typically 10 kW to 17 kW+ variants)

• Related Brands: Select Jämä Star and Metrosaver models using Nibe internals.

Diagnostic & Replacement Notes

• Low Pressure (LP) Faults: If your heat pump displays an LP alarm or brine flow alarm, a failing brine pump or incorrect speed modulation is a common root cause.

• Brine Compatibility: Not recommended for use with Kilfrost brine solutions, as certain chemical mixtures can prematurely degrade pump seals. Standard propylene glycol or ethanol brine mixtures are standard.