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

Why should I have a filter fitted?

Many boiler breakdowns occur are due to sludge in the heating system. Find out the many benefits of fitting a magnetic filter & how it can save you money.

Why should I get the water in my central heating system cleaned?

If Boiler breaks down due of sludge in the system, the repair work is not covered by the Boiler warranty & can lead to expensive repair bills. Read more...

Why are my radiators cold?

Not sure why your radiators cold at the top or bottom? Find out the reasons and simple solution to resolve this.

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...

What is a magnetic boiler filter?

Find out everything you need to know about the magnetic boiler filter, how they function, why should the filter be fitted, and how to look after them.

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