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Heating - Service, Repair, installation

Central Heating Flush

A power or central heating flush is the process of cleaning a central heating system by circulating high-pressure water and cleaning agents. This removes debris, rust, and sludge, helping your heating system run more efficiently.

What does a central heating power flush entail?

Before starting the flush, our engineer will fire up your boiler and check all radiators for cold spots. Then all radiator valves are opened or removed, and dust sheets placed over carpets and furniture before the power flushing machine is connected.

The first power flush uses flushing chemicals including a non-acidic debris mobiliser, scale and corrosion inhibitor, boiler noise silencer, leak sealer and neutralising crystals. These chemicals are added to the power flushing machine which is attached to the boiler using a pump. This first flush takes around 20 minutes. Once completed, each radiator is isolated and flushed while using a rubber mallet to loosen up any sludge inside.

This process is followed by a second flush, which cleans each radiator individually and reverses the fluid forward and back until it is clear on all radiators. Another full central heating flush is carried out until all sludge has been removed. The final step is the addition of an inhibitor that is circulated through the system before the radiator valves are refitted,

If successful, you will notice an immediate improvement in the temperature of your radiators.

You will also be provided with a certificate of completion to confirm that the work has been carried out by a professional.

How does a central heating flush help my heating system?

The efficiency of your heating system will improve after a power flush simply because a cleansed system that is free of debris and sludge will allow water to flow more easily through the pipes. This decreases the effort required by the boiler and increases the longevity of the system overall.

When do I need a central heating flush?

If you have cold spots in your radiators, radiators that are cold at the bottom and warm at the top, or one or more radiators that are not working, a central heating flush may help resolve the problem.

Also, if a new boiler is fitted, your boiler engineer will recommend a power flush to protect the new boiler and prevent any issues that dirty system water could cause.

How often do I need a central heating flush?

It is recommended that a power flush is carried out every five to six years, but this can vary depending on the age of your boiler and water hardness in your local area.

How much does a central heating flush cost?

The average cost to flush your central system is £300-£500, but this will depend on the size of your property and the number of radiators. We will assess your requirement and provide a full fixed quotation before carrying out the work.

How long does a central heating flush take?

This can really depend on the number of radiators and how much dirt or sludge is present in the system. For a typical three-bedroom semi-detached house assume around 6 hours.

Hire a professional

If you are experiencing any central heating system problems or believe that your system may need a central heating flush, its best to call a professional instead of trying to fix the issue yourself, we will assess your heating system and ensure that a central heating flush is the best course of action to improve the efficiency of your heating system.

If you would like to discuss a central heating flush, please call us today on 01502 719726.