The ALPHA1 is an energy efficient, variable-speed circulator built with reliable, electronically controlled Grundfos permanent magnet motor (ECM) technology. Featuring three-constant pressure control modes, an LED display and easy-to-use push button controls, the ALPHA1 is the perfect solution for domestic hydronic heating and hot water recirculation applications.

Features & Benefits 

  • ALPHA1 can replace more than 30 other pump models  
  • ALPHA1 features the highest torque rating and most powerful start feature in its class which attempts to restart indefinitely every seven seconds in blocked rotor conditions  
  • Designed with trusted Grundfos ECM (permanent magnet motor) technology which has been used by Grundfos for more than 15 years 
    ALPHA1 features three-constant pressure control modes with easy to use push button settings 
  • Large LED display shows energy watt consumption and flow indicator in gallons per minute  
  • Available in both cast iron and stainless steel models  
  • ALPHA1 is compatible with either a line cord or terminal box for conduit connections  
  • Extremely quiet 19.2 dB(A) operation – tested in one of the best European sound labs  
  • ALPHA1 features an integrated check-valve and nut captures for flanges  
  • Magnetite resistant design with a stainless-steel bearing plate, robust ceramic shaft and ceramic bearing rings

The GRUNDFOS ALPHA1 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. 



ALPHA1 Installation & Operating Instructions

ALPHA1 Installation & Operating ...

Installation & Operating Instructions

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6.9 MB - 48 Pages

ALPHA1 Product Flyer

Product Flyer

ALPHA1 Product Flyer

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547 KB - 2 Pages

ALPHA Data Booklet

Data Booklet


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3.66 MB - 38 Pages


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Grundfos Kansas City – Grundfos Brand
Toll-Free Number: 1-888-237-1960
Local Number: 913-227-3400