ALPHA1 L circulator pump – heating

The ALPHA1 is the only upgrade and replacement pump that fits 95 % of boilers equipped with Grundfos pumps.

General Details


Universal Circulator Pump for Boilers

With its compact design, simple connection to boiler signal cables (PWM), and tolerance for higher ambient temperatures, the ALPHA1 fits seamlessly in the majority of boilers equipped with Grundfos pumps, regardless of the boiler brand. This makes it easy to replace broken or inefficient pumps without the need for excess spares.

Energy Efficient Performance

Not only is the ALPHA1 a convenient and reliable option to replace broken pumps, it also offers superior energy efficiency- making it the perfect choice for an upgrade. The ALPHA1 features a state-of-the-art energy efficient motor that uses less energy to operate than older models, and can result in lower operating costs.


  • Fits 95 % of boilers equipped with Grundfos pumps
  • State-of-the-art energy efficient motor for energy and cost savings
  • Reliable performance and long pump lifetime
  • Quiet operation, low running noise levels of 42-43dB(A)

The ALPHA1 is suitable for running in:

  • Boilers
  • Underfloor heating installations
  • Mixing units and boiler kits
  • Domestic hot water systems
  • Biomass heating
Technical service