does a combi boiler need a magnetic filter

Jan 03, 2024

The purpose of a magnetic filter is to prevent the accumulation of sludge, or debris, in the boiler and radiators. This build-up can lead to decreased efficiency, higher energy bills, and even system breakdowns.


A combi boiler, by nature, is more susceptible to sludge buildup as it relies on a smaller volume of water to heat on demand. This means that any debris that enters the system has a greater impact, as there is less water to dilute it. A magnetic filter, installed on the return side of the boiler, catches the magnetic particles in the water flow, preventing them from settling in the system.


A combi boiler owner who invests in a magnetic filter can expect several benefits. Firstly, their boiler system will operate at optimal efficiency, resulting in lower energy bills. Sludge in a heating system can cause blockages, meaning that the boiler has to work harder to heat the home, using more energy than necessary. In addition, a magnetic filter helps to protect the system from damage caused by corrosion, helping to extend the lifespan of the boiler.


Another benefit of a magnetic filter is the convenience it offers in terms of maintenance. A magnetic filter captures the debris in the system, removing the need for frequent flushing or chemical treatments to remove sludge. Instead, the filter can be easily cleaned during annual boiler servicing. This saves both time and money for the homeowner.