2. Why should I get a magnetic filter fitted

Why should I have a filter fitted?

Many boiler breakdowns that occur are due to sludge in the heating system.


This ‘sludge’ (which is also known as magnetite) is caused by fragments of rust and other debris in the pipes that accumulates over time and, if left, can cause cold patches on your radiators, make your boiler work harder to heat your home and also can block or damage the components inside your boiler.


A magnetic filter will attract the magnetic debris in the system water before it enters your boiler, which has many benefits:


  • It can extend the life of your boiler and central heating system
  • It reduces the risk of your boiler breaking down and having to pay for costly callouts
  • It reduces the expense of replacement parts
  • It can reduce your energy bills by up to £80
  • It can reduce your carbon emissions by 7%
  • It can increase the heat from your radiators by up to 47%


It is worth noting that our boiler warranties do not cover damage to the boiler that is caused by sludge in the system.

What is central heating sludge?

Sludge or magnetite if left to build up, can damage the boiler and the heating system. Find out everything you need to know about Sludge here.

Do I have to have a magnetic boiler filter installed?

Fitting a filter is considered best practice when installing a new boiler.

Related FAQs

Does my boiler filter need cleaning?

Your filter should be cleaned during your boiler’s annual service. This will prevent sludge building up in your system. Some filters come with an app that can warn you when they filter needs to be cleaned, so that you can arrange for your installer to visit before it gets too full.

Read more

What is central heating sludge?

Central heating sludge is a substance that builds up in central heating pipes as a result of rusted and dissolved metal settling in the system.

Read more

Do I have to have a magnetic boiler filter installed?

Having a magnetic filter installed is considered best practice when installing a new boiler, and your installer will be required to carry out a series of important steps to ensure their work is compliant with the Building Regulations in England and Wales. 

Read more

What is a magnetic boiler filter?

A magnetic boiler filter is a small device that is installed into the pipework close to where the water goes back into a boiler. It is used to prevent the buildup of sludge within the pipework, which can cause the boiler to break down if left untreated. 

Read more

Why should I have a filter fitted?

Many boiler breakdowns occur due to sludge in the heating system. A magnetic filter is an effective way of preventing this sludge from accumulating, and may prevent costly breakdowns at a later stage.

Read more
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