Call us : 0800 888 6879
Opening hours : Mon-Fri 8am-5pm
Call us : 0800 888 6879
Opening hours : Mon-Fri 8am-5pm
Central Heating Power Flush2022-04-20T21:56:18+00:00

Central Heating Power Flush

Central Heating Power Flush

Before today, you may or may not have heard the term “central heating power flush”. Now that you have, you’re probably asking yourself, “what is a power flush?”

First of all, no it doesn’t have anything to do with your toilet.

If these harmful contaminants are left in the system, they can adversely impact its efficiency.

In some cases, a power flush may be the only option you have available to fix the problem.

So what is a power flush? It might be the best way to bring your heating system back to top performance.

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What Is Central Heating Power Flush?

Power flushing is essential for keeping the insides of the heating system and radiators clean and free of obstructions. Over time, magnetite will build up in these systems and begin to cause issues that will prevent the heating from working correctly.

A power flush involves pumping fresh water and cleaning chemicals into the pipes of the heating system to remove any dirt and debris. This will knock loose and remove any potential clogs.

Once the power flush is complete, you can expect your system to run smoothly unless other problems exist.

The flush requires a trained heating engineer and equipment to complete, which is reflected in the power flush cost.

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When You Might Be in Need of a Power Flush

If you’ve been keeping up with regular yearly maintenance and service, you should only need a flush performed every 5 or 6 years.

This can vary depending on the system you have. As an example, there are boilers that use copper heat exchangers instead of stainless steel.

These will corrode much quicker.

If you plan on replacing your boiler, make sure your engineer performs a flush prior to installation. If they don’t, you run the risk of contamination to the new boiler from debris and sludge still hanging out in the pipework.

Key Signs to Look For

Now that we’ve answered the all-important question of “what is a power flush?”, let’s look at signs to be aware of when a power flush may be needed.

  • Your radiators have cold spots on them. Especially on the bottom.
  • You’re hearing a lot of noise from the boiler or the system pump.
  • There’s discoloured water when bleeding the radiators.
  • The heating warms up very slowly.
  • You notice cloudy tap water. This is a sign of excessive limescale in the system or other factors.
  • Some of your radiators don’t heat up as well as others.
  • The radiators are cold but the pipes are still hot.
  • You always notice the boiler shutting down and have to re-start it.
  • When you try to bleed a radiator, no water comes out.
  • Your radiators and/or boiler are very noisy.
  • There are small leaks in the radiators.
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Our Power-flushing engineers will:


  • Isolate the cold feed to your central heating system
  • Remove the lowest positioned radiator and connect a professional power flushing pump and magnet system to flow and return pipework
  • Set up the power flush system, connect to your mains water and connect the dump valve
  • Open all radiators, taking care to check the operation of the valves and start the power flushing process
  • Power flush using the power flush pump with magnetic pack system, concentrating on each individual radiator, pipe and valve, plus your pump, boiler and boiler heat exchanger
  • Add the chemicals and agitator tool to dissolve sludge, hardened deposits, scale and silt and use a special tool on each radiator to loosen any stubborn sludge
  • Check that the condition of the radiator water and the pH level (measure of acidity) is similar to your mains drinking water level, then add an inhibitor to help prevent future build-up of sludge, scale, corrosion and bacteria
  • Run your central heating and balance the system to ensure the distribution of heat is correct
  • Provide all the above for one fixed price

Central Heating Power Flush Cost

The costs of a power flush include the necessary equipment, chemicals, and service required to completely clean the heating system. A heating engineer or trained specialist is required.

In general, you can expect a power flush to be around £500 or more depending on the number of radiators. Each specialist will also often set their own standard rates depending on their experience and business needs. Some will even offer special pricing plans like a standard rate for the main system plus an additional fee for any extra radiators.

If the price seems steep from one specialist, shop around and compare different rates.

Also, keep in mind that these costs are usually a lot smaller than expensive repairs and replacements that are traditionally needed with faulty heating systems.

Premier Gas Solutions Engineers caters for both domestic & commercial power flushing customers.

Whatever size your property, flats or houses to commercial office blocks, schools & other large building we have the power flushing equipment and expertise to suit your needs.

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Frequently asked questions.

Below are some of the common questions we get asked.

How do I know if I will need a power flush?2022-04-20T21:58:46+00:00

Our engineers will first ask if the radiators are fully heating with no cold spots near the bottom, cold spots at the top are more likely trapped air. We can also take thermal images using our thermal imaging equipment as the radiators may be too far gone and old to power flush.

I have been told that a power flush can damage my existing system?2022-04-13T13:27:14+00:00

This may be true in an old gravity fed system where pipe work has been poorly installed or by using compression fittings. We would always check first before advising on a power flush.

Must I have a power flush when changing my boiler?2022-04-13T13:28:14+00:00

No, we would only advise this if the system is heavily contaminated. You would just carry out a standard system flush.


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