How to avoid mechanical failures in the heating system

What is magnetite and how does it affect your heating system?

Magnetite is a mineral that can form in heating and hot water systems. It is generated as a result of the corrosion of the system's metal components, releasing heavy particles that mix with the water. Over time, these particles tend to build up, especially in the lower parts of the system, such as radiators, causing a kind of black sludge to form in the water.

This sediment becomes a real problem when it settles on the pipes, valves, boiler or even the pump of the heating system. As it builds up, it can block the flow of water, reducing the efficiency of the system and potentially causing serious breakdowns, affecting the performance of the entire system.

How to prevent magnetite problems

Magnetite only forms when there is oxygen in the heating system, so it is important to check for leaks in the system that allow air to enter. In addition, it is recommended to use water that complies with quality regulations, such as the German standard VDI 2035, to minimise the risk of magnetite formation.

Grundfos, with its experience in heating systems and circulators, has developed specific solutions to manage these types of problems. Grundfos circulators are designed to resist the presence of magnetite and other impurities, making them ideal for protecting heating systems. These circulators are rigorously tested during development to ensure they are resistant to particle build-up in the system.

Features of Grundfos circulators

- Ceramic and carbon bearings and shafts: These materials do not attract magnetite, reducing the risk of particle build-up on these components.

- Optimised flow conditions: The internal design of the circulators favours a flow that minimises the build-up of large particles and ensures proper lubrication and cooling of the internal components.

- Stainless steel rotor surface: This provides an additional layer of protection against impurities such as magnetite.

Additional protection functions

Some Grundfos circulators include advanced functions such as automatic unlocking and summer mode, which are designed to prevent blockages during periods of inactivity. In addition, certain models have a manual unlocking screw that allows the shaft to be released if it has become stuck due to magnetite build-up.

Benefits of preventing magnetite in heating systems

- Reduced stress on mechanical parts*: By preventing magnetite buildup, wear and tear on system components is reduced.

- Minimized starting problems: Preventing magnetite also contributes to smoother start-ups after long periods of inactivity, such as at the end of summer.

Keeping your heating system free of magnetite not only prolongs its lifespan, but also improves its efficiency and prevents costly repairs in the future.