Grundfos. Alpha1 L is a high-efficiency circulation pump with permanent magnet motor (ECM technology). With its compact design, easy connection to boiler signal cables (PWM) and tolerance for higher ambient temperatures, the Alpha1 L fits seamlessly into 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 additional spare parts. The Alpha1 L is not only a convenient and reliable option for replacing broken pumps, but also offers superior energy efficiency, making it the perfect choice for an upgrade. The Alpha1 L features an advanced, energy-efficient motor that consumes less energy to operate than older models and can lead to lower operating costs.