How to service and clean magnetic filters

How to guide on Cleaning Your Magnetic Filter: Learn How property owners Can DIY and Save Money by regularly servicing and cleaning their own magnetic filters


Having a magnetic filter alone isn’t going to ensure your central heating system runs efficiently. Magnetic filters provide an effective means of preventing costly repairs due to blocked pipes and radiators. By following this step-by-step guide on how to best clean and service your magnetic filter, you can ensure that it runs at maximum efficiency all year round and your property’s central heating system remains safe from sludge build up and blockages. 

Why do I need a magnetic filter? 

Magnetic filters are important for central heating systems because they help remove sludge from the system, which can damage radiators and boilers if it accumulates.  

The filter also helps protect against further build-up, which could otherwise lead to expensive repairs or replacements. By keeping the system free of debris, sludge, and contaminants, a magnetic filter allows for a more efficient operation of the central heating system and extends its lifespan. 

How to clean your magnetic filter 

  1. A magnetic filter can help reduce wear and tear on the boiler components, increase efficiency and also help to protect against blockages or even total failure of components.  
  1. However, it is important to clean and service your magnetic filter regularly in order to ensure it remains effective. Here’s a step-by-step guide on how to effectively clean and service your magnetic filter. 
  1. Turn off the boiler system: Before you start any work on your boiler system, be sure to turn off the power at the mains. This will prevent any damage or shock occurring during the cleaning process.  
  1. Remove the magnetic filter: Once you have turned off all power sources, you can begin by removing the magnetic filter from its housing. Most manufacturers provide a tool or key for turning off the isolation valves and an additional tool for removing the cap. Make sure all the valves are isolated, remove the cap and take out the filter. 
  1. Clean the magnetic filter: Separate the magnet from the plastic covering. Using a soft cloth and some gentle detergent mix, gently scrub away any dirt or debris that may have accumulated within the inner workings of your magnetic filter over time. Once you are happy with your cleaning job, dry off any excess moisture using a cloth or paper towel before continuing with further steps of servicing/cleaning.  
  1. Dispose of build up. It is important to not wash away the build up in a sink as this can cause blockages in your sink and pipe work. In addition the rusty build up can also mark the sink.  
  1. Inspect the seal. Inspect the rubber seals or washers around the magnetic filter for any damage or wear. Replace as necessary to avoid future leaks 
  2. Refit the magnet. Slowly re-insert the magnet into the housing, being careful not to spill the water that is remaining within the housing. 
  1. Open isolation valves. Once you have refitted the magnet and tightened (do not overtighten as this can cause damage to the washers) open the isolation valves and bleed the air from the filter. 
  1. Test system for correct operation: Finally test for correct operation by turning the heating system back on. Look out for signs such as pressure drops/increases or erratic behaviour as these could indicate that something has gone wrong during maintenance procedure itself. If this happens turn off power immediately and contact a heating engineer in order resolve issue professionally without causing damage elsewhere. 
  1. Top up the boiler pressure as required. There maybe a slight drop in the system pressure due to the air taken out of the system. Top up boiler pressure as needed. 

How often should I clean a boiler’s magnetic filter?  

Once a year, your magnetic filter should be thoroughly cleaned. This should be done on a regular basis to extend the life of your boiler. Allowing the filter to become full and clogged with debris and sludge increases the likelihood of a boiler breakdown.  

Final Thoughts 

In conclusion, having a regularly cleaned magnetic filter is essential to maintain the performance and the efficiency of your central heating system 

If you think the above steps maybe beyond your plumbing capabilities contact our team for a quick low cost Magnetic Filter Service and cleaning. 


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