Central Heating Systems

Magnetic Filter Installation

A magnetic filter is fitted to your central heating pipework to capture circulating metal debris (sludge) before it reaches the boiler, pump and valves. It helps your system run cleaner and more reliably, reducing cold radiators, noise and avoidable breakdowns.

More information

What magnetic filter installation covers

A magnetic filter is installed on the heating circuit, positioned to intercept debris as water circulates. The service is designed to protect key components and improve day-to-day heating performance.

  • Assessment of your heating layout and best filter position
  • Safe isolation and drain down of the relevant section
  • Cutting into pipework and fitting the magnetic filter with correct flow direction
  • Checks for leaks, correct circulation and stable pressure
  • Advice on cleaning intervals and ongoing system care

When this service is most useful

  • You are fitting a new boiler and want to protect the warranty and internal components
  • Radiators have cold spots, the system is slow to heat, or you have frequent bleeding
  • The boiler is noisy, pumps or valves are sticking, or you have repeated call-outs
  • You manage a rental property and want fewer heating issues between tenancies
  • A small commercial premises needs dependable heating with minimal disruption

How the installation is carried out

The system is reviewed to confirm pipe sizes, access, and the most effective location, typically on the return near the boiler. The heating circuit is isolated, the filter is fitted, then the system is refilled and tested to confirm correct flow, pressure, and safe operation. If there are signs of heavy contamination, you may be advised on cleaning options so the filter can work effectively from day one.

After installation: keeping the benefits

A magnetic filter needs periodic cleaning to stay effective. You will be shown what to look for, how often it should be checked, and what to expect if the system is still shedding debris. Many clients combine filter checks with boiler servicing to keep heating performance steady year-round.

Frequently Asked Questions

What does a magnetic filter do in a central heating system?
It captures magnetic iron particles (magnetite) that circulate in the heating water. This helps protect the boiler, pump and valves from wear and blockages. It can also reduce radiator cold spots and system noise over time.
Do I still need a magnetic filter if my boiler is new?
Yes, a new boiler can still be affected by debris from older radiators and pipework. A filter helps keep the new heat exchanger and pump cleaner from the start. It is a common requirement to support reliable performance.
Where is the magnetic filter fitted?
It is usually fitted on the return pipe to the boiler, where it can capture debris before water re-enters the boiler. The exact position depends on access, pipe layout and available space. The goal is a location that is effective and easy to service.
Will my heating and hot water be off during installation?
Yes, the system normally needs to be isolated and partially drained while the filter is fitted. In many homes the disruption is limited and everything is tested before being left running. You will be advised in advance if access or system condition is likely to extend the work.
How often does a magnetic filter need cleaning?
It is commonly checked during annual boiler servicing, and sometimes sooner after first fitting if the system is dirty. Cleaning is quick and involves removing the collected sludge from the filter chamber. Regular checks help maintain flow rates and protect components.

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