ALPHA1 circulator pump - heating, cooling, hot water



The Grundfos ALPHA1 is our cost-efficient yet high-performing circulator, offering
energy efficiency at an affordable price. The ALPHA1 has been proven to reduce
energy use by up to 80 % compared to traditional pumps and is the ideal choice
in applications where the Grundfos UPS has been used to fulfil basic circulator

The ALPHA1 offers multiple operation modes and is adaptable to one- or
two-string radiator systems and underfloor heating systems. This means it’s
easy to install and can take care of all your basic pump needs.

Proportional pressure

The ALPHA1 features three proportional pressure modes. If selected, the
differential pressure varies proportionally with the flow, i.e. a higher flow
means higher differential pressure. Proportional pressure is the preferred choice for two-string radiator systems.

Constant speed or constant pressure

The ALPHA1 offers three constant speed modes for constant flow applications. The pump also features three constant pressure modes to maintain pressure regardless of the flow.
These constant pressure modes are the preferred operation modes for underfloor heating systems and one-string systems.

Easy operation

The ALPHA1 features a power display and indications for control modes that provide an easy overview of all pump operations. The circulator’s intuitive one-touch operation also makes control mode selection simple while the ALPHA plug makes electrical installation easier than ever.

The Grundfos ALPHA1 is suitable for:

  • One and two-pipe radiator systems
  • Underfloor heating systems
  • Domestic hot-water recirculation
  • Suitable for air-conditioning systems with liquid temperatures ≥ 2 °C

Key features and benefits:

  • Proportional pressure mode
  • Constant speed mode
  • Constant pressure mode
  • Easy installation and operation 


  • Low energy consumption
  • Simple installation and operation
  • Basic functionality needs for most heating systems



ALPHA1 - Affordable energy efficiency

SCALA1 (GB/Brazil version) (I & O instructions)

Installation and operating instructions

Grundfosliterature-5260965.pdf (9 MB)







Spare parts


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