Grundfos Circulator Pump ALPHA1 25-40 180

Heating systems often suffer from inefficient circulation, leading to uneven warmth and high energy bills. The Grundfos ALPHA1 25-40 180 circulator pump solves this by delivering precise, demand-driven performance. With its ECM motor and intelligent control modes, it adjusts speed automatically to match system requirements, ensuring optimal comfort while minimizing power consumption.

Who is it for

This pump is ideal for homeowners and HVAC professionals seeking a reliable, energy-efficient solution for residential heating systems, including radiator and underfloor heating, as well as hot water recirculation. Its compact 180 mm port-to-port length makes it a perfect drop-in replacement for older pumps in tight spaces.

Main features

• Energy-efficient ECM motor with EEI ≤ 0.23, significantly reducing electricity usage.
• Three control modes: proportional pressure, constant pressure, and constant curve for flexible system adaptation.
• Quiet operation and high starting torque for reliable performance.
• Durable cast iron housing and composite impeller for long service life.
• Wide liquid temperature range from 2 °C to 110 °C, suitable for various applications.
• IP42 protection against dust and dripping water.

Specifications

• Max head: 4.0 m
• Max flow rate: 2.8 m³/h
• Power consumption: 3–22 W
• Voltage: 1 x 230 V, 50 Hz
• Pipe connection: G 1 1/2" (DN 25)
• Port-to-port length: 180 mm
• Max system pressure: 10 bar
• Insulation class: F

Tips

For optimal performance, install the pump with the motor shaft horizontal. Use the AUTOADAPT function to let the pump automatically find the best setting for your system, saving energy and ensuring comfort. Regularly check for air in the system and bleed if necessary.