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

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

If sludge is allowed to build up, it can result in blocked pipes, inefficient radiators and damaged parts in the boiler.

 

The heat exchanger in a boiler consists of many narrow pathways which the water passes through to heat up. If these become restricted or blocked, the boiler will shut down to prevent it from overheating and getting even more damaged.  If the boiler breaks down because of sludge in the system, the repair work is not covered by the boiler warranty and could lead to expensive repair bills.

 

Sludge can cause:

 

  • Damage to the boiler
  • Damage to the boiler pump
  • Damage to radiators, including leaks
  • Damage to radiator valves
  • Blocked pipework, including on the heat exchanger
  • Higher energy bills

What is central heating sludge?

Sludge, or magnetite, to give it its proper name, is a black substance in the central heating pipes made up of dissolved and rusted metal.

How do I know if I've got sludge in my central heating system?

Read on to find out what the common signs of sludge in your central heating system are.

Related FAQs

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

It’s important to have the water in your central heating system cleaned regularly to prevent sludge buildup, which can lead to blocked pipes and ultimately, cause breakdowns. Repairs needed as a result of sludge are not covered by Baxi warranties.  

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Why should I have a filter fitted?

Boilers tend to break down as a result of sludge building up in the system. A magnetic filter captures these particles and prevents them from entering your boiler system, extending the life of your appliance and reducing the risk of a breakdown.

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Why are my radiators cold?

Cold radiators are usually a consequence of air being trapped inside the radiator. Simply bleed the radiator and the problem should be resolved. Sludge buildup can also cause differences in the top and bottom of your radiator and impact its efficiency. 

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How do I know if I've got sludge in my central heating system?

If you notice your radiators are hot at the top but cold at the bottom, or need to bleed your radiators more often, then you may have sludge built up in your system. 

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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.

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