The universal upgrade and replacement pump

The ALPHA1 L is a universal replacement and upgrade circulator pump. It can replace most old Grundfos circulators in appliances – such as boilers – and is a convenient and reliable option for replacing thousands of old inefficient pumps currently in operation.

With its compact design, simple connection to boiler signal cables (PWM) and tolerance for higher ambient temperatures, the ALPHA1 L 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.

Fits all applications

The ALPHA1 L is flexible enough for you to use in almost any heating application and is perfect for boilers.

Clever solution

PWM signals and profiles available with return signal showing power consumption, alarm and operation status.

Robust start-up

If the rotor is blocked, the pump automatically attempts a restart, swiftly breaking up any deposits of dirt or lime. You can also access a manual deblocking screw from the front.

Easy use

Simple user interface and one-touch operation enables simple set-up.

When speed is demanded, you’ve got the ALPHA1 L

You are the Installer. See why replacements are never an issue for you with the ALPHA1 L circulator pump.

One ALPHA to fit them all

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

How to install and control ALPHA1 L

The ALPHA1 L is the pump you'll want to bring along for replacement. Watch the video and see how easy it is to install and control the ALPHA1 L.

See how customers benefit from this product

When Grundfos is a part of the solution, you get reduced energy consumption, increased comfort and unsurpassed operational reliability. Read our customers' own stories about how they benefit from the Grundfos approach to intelligence, water and energy.

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