Grundfos Alpha1 25-60 130 High-Efficiency Circulator Pump

The Grundfos Alpha1 25-60 130 is a high-efficiency circulator pump engineered for heating, domestic hot water, and cooling systems. Its standout capability is the adaptive AUTOADAPT control, which automatically adjusts performance to match system demand, delivering optimal comfort with minimal energy consumption. With a maximum head of 6 meters and a flow rate of up to 3.0 m³/h, it handles a wide range of residential and light commercial applications.

Advantages

The pump features a robust cast iron housing and a composite impeller, ensuring durability and corrosion resistance. Its energy efficiency index (EEI) of ≤0.23 exceeds the requirements of the EU's ErP directive, making it an excellent choice for reducing electricity bills and carbon footprint. The pump operates quietly at less than 43 dB(A), contributing to a peaceful indoor environment. Installation is simplified with the 130 mm port-to-port length, which matches many existing pump installations, and the plug-and-play power connection.

Suitable for

• Residential heating systems (radiators, underfloor heating)
• Domestic hot water recirculation
• Cooling and air-conditioning systems
• Replacement of older, less efficient circulator pumps

Key specifications

• Max head: 6.0 m
• Max flow rate: 3.0 m³/h
• Connection: G 1 1/2" (DN 25)
• Port-to-port length: 130 mm
• Power consumption: 5–45 W
• Voltage: 1 x 230 V, 50/60 Hz
• Protection class: IPX4D
• Insulation class: F
• Max operating pressure: 10 bar
• Liquid temperature range: 2 °C to 110 °C
• Control modes: variable speed, proportional pressure, constant pressure, constant curve
• Approvals: CE, VDE, EAC, WEEE

Recommendations

For optimal performance, install the pump with the motor shaft horizontal and ensure the system is properly vented. Use the AUTOADAPT mode for most applications; switch to constant pressure or constant curve only when system characteristics require it. Regular maintenance is minimal, but keep the pump free from debris and check for leaks at the connections annually.