An introduction to the MAGNA1 Model C in the circulator range

Get a brief introduction to MAGNA1 Model C itself and the applications it is suited for. You’ll also gain an insight into both the single and twin pump variants, and when you should opt for one over the other.

The MAGNA1 model C circulator pump adds to the comprehensive Grundfos range of circulator pumps. 

In this module, we’re going to briefly introduce you to MAGNA1 Model C. We’ll show you how it fits in the Grundfos range of circulators and in which applications it can be used. We’ll also take a closer look at the twin pump functionality and when it’s recommended to select this variant. Let’s get started. 

First of all, the MAGNA1 is built on the same reliable, high-efficient MAGNA technology as its predecessors. It’s mainly intended for commercial buildings such as schools, hospitals and residential buildings. With its ability to connect to simple control and monitoring systems, it’s an ideal solution for simple jobs.  

The MAGNA1 can be installed in any new commercial building as a main pump, regardless of the application it’s running in. And thanks to its low investment cost and high-efficient operation, it’s also a perfect replacement pump for old, inefficient three-speed pumps, which don’t offer the same connection options that many new buildings require from their pumps. 

The MAGNA1 is designed for a number of applications including:  

Heating systems 

Domestic hot-water systems 

Air-conditioning and cooling systems 

Ground source heat pump systems 

And solar heating systems  

Additionally, MAGNA1 can handle liquid temperatures from -10c° to +110c°. 

The MAGNA1 is available both as a single pump and a twin pump. In the next part of the module, we’re going to take a closer look at the twin pump variant, and when it’s the right choice to select it. 

In the MAGNA1 twin pump variant, the two pump heads share the same pump housing and are connected wirelessly. One of them acts as a redundant back-up to the other, ensuring that if one becomes unavailable, the redundant one automatically takes over. 


This is called duty/standby mode. It guarantees a continuous supply of heating or cooling, bringing peace-of-mind to you as well as the end-user. The twin pumps operate in alternating mode, ensuring that the operation hours are divided equally between the two pump heads. 

So, when is it the right option to choose a twin pump over a single pump? Well, if downtime isn’t tolerated, a twin pump is the optimal choice. For instance, at a hospital where it’s essential that there is no downtime, it is crucial that you select the twin variant operating in duty/standby mode  

However, for some jobs, a single MAGNA1 is a sufficient and cost-efficient solution. When a twin pump is the optimal solution, the specifier will typically provide the answer by noting that there is a supply redundancy. 

That covers the basic introduction to the Grundfos MAGNA1 model C circulator pump. Let’s recap. 

The MAGNA1 is mainly intended for commercial buildings. 

It can be connected to simple control and monitoring systems. 

It’s designed to work in a number of applications, both as a main pump and a replacement pump. 

It’s available in a single and a twin variant – the twin variant ensures a continuous supply of heating or cooling, bringing peace-of-mind to both installer and end-user, while the single variant offers a cost-efficient alternative.

Course overview

Modules: 3
Completion time
Completion time: 22 minutes
Difficulty level
Difficulty level: Intermediate