ALPHA2 circulator pump

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ALPHA2 from Grundfos represents a new generation of circulator pumps that use down to 5W – the A-labelled pump can save up to 10% of a household’s total power consumption.

In households all over Europe the circulator pump is one of the largest individual energy consumers. The energy-optimised Grundfos circulators sold since the introduction of the European Energy Labelling Scheme for heating circulators (2005-2007) will provide annual electricity  savings of more than 1,400 million kWh. This corresponds to the total annual electricity consumption in more than 320,000 average European households.

Compared to what the customers have been used to so far ALPHA2 is a very revolutionary circulator. The pump is full of new functions and innovative technology that will save the house owners a lot of money and the installers a lot of trouble, and last but not least will contribute considerably to reduced CO₂ emissions. A traditional old circulator that typically runs full speed day and night is one of the big entries on the electricity bill – actually it is responsible for up to 10% of the total power consumption of a household. ALPHA2 can automatically adjust the power output down to 5 W whereas a standard pump’s power output is 60-100 W. It means that a standard pump has a power consumption of 4-500 kWh per year, whereas an ALPHA2 consumes down to 90 kWh – or a saving of up to 80%.

On top of the A-rated efficiency Grundfos has integrated the unique AUTOADAPT function formerly only available for commercial applications in the Grundfos MAGNA. The function analyses the consumption pattern and automatically adjusts output to demand – also in connection with the changing temperatures of the seasons. The result is optimal comfort and the least possible energy consumption.


Robust start-up:

- Shakes free any impurities before the pump starts at the beginning of the heating season.

Summer mode:

- Adjustment of the pump’s performance in the summer to the warmer temperature outside – giving customers extra energy efficiency

Magnetite resistance:

- Ensures that no small pieces of metal get stuck in the pump’s vital parts when they are magnetised

Dry-running protection:

- Makes sure the pump never runs without liquid in the system

Add to that unrivalled energy efficiency, easy installation and the fact that ALPHA2 covers both your heating demands and up to 90 % of your air-conditioning and cooling demands.


The GRUNDFOS ALPHA2 is suitable for:

- Systems with constant or varying flow

- One pipe systems

- Two pipe systems

- Underfloor-heating

- Domestic hot-water recirculation

- Systems where night setback is required.

Features and benefits

- Better performance with market leading efficiency (EEI≤0.15) in a more compact design

- New flow meter for trouble-shooting and balancing

- AUTOADAPT selects best performance curve for efficiency and comfort

- Innovative plug simplifies pump connection

- Insulation shells included.

Date of release