What is a Power Flush?

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Have you got cold patches in your radiators? As your boiler and central heating system gets older, debris and substances can start to build up within your system and can potentially affect the efficiency of your boiler. If you find cold patches in your radiator(s) whilst the boiler is on, then your system may require a power flush. In this article, we explain what a power flush for central heating is and when it is needed.

So, what is a power flush for central heating?

A power flush is a cleansing process for a central heating system. The flush involves using a chemical solution to remove any sludge, debris or substances which have built up inside your central heating system. As your central heating system gets older, the water in your boiler, pipes and radiators produces unwanted substances and can cause your radiators to not heat up properly or cause your boiler to breakdown.

The power flush will remove the unwanted sludge, debris and substances in your system preventing blockages and central heating inefficiency. Therefore, your boiler and radiators will heat your home more effectively and extend the lifespan of your system. Normally a power flush is carried out on older systems that are no longer working effectively. A qualified engineer will carry out a power flush by attaching a pumping unit to the central heating system. The pump will incorporate a high flow with low pressure, allowing the cleaning chemicals to flow around the system. These cleaning chemicals will flush away all the sludge, debris or substances that have built up over the years. Power flushing could be an ideal solution to clean and maintain your central heating system.

During an annual boiler service, a Gas Safe engineer will perform a number of tests and checks on your boiler and heating system to identify if there are any potential areas of corrosion or sludge build up. The engineer will then advise you if a power flush is required and make you aware of any potential leak risks which can arise in the most corroded areas. A preventative power flush is recommended every 5-6 years to clear any debris and prevent blockages. It is also recommended to have a power flush before installing a new boiler. This will prevent any existing rust and sludge in your pipework or radiators causing damage to your new boiler.

When is a power flush needed?

Below are the most commons signs to look out for that suggest your central heating system may need a power flush:

  • Do you find cold patches in your radiators, particularly at the bottom?
  • Do loud noises come from your boiler or the heating pump?
  • Are your radiators and boiler noisy?
  • Do you have leaks coming from your radiators?
  • Does your central heating take longer than normal to heat up?
  • Are your radiators not getting warm, even when the boiler is switched on?
  • Do some of your radiators not heat up as well as others?
  • When you bleed your radiator(s) is the water discoloured or does no water escape?

We recommend that you seek advice from one of our Gas Safe Registered engineers who will advise you on whether your central heating system requires a power flush.

What are the benefits of a power flush?

Here are 8 ways your central heating system could benefit from a power flush:

  • A power flush will improve the energy efficiency of the system which reduces the energy cost
  • Radiators will heat up quicker and be hotter
  • It will increase the lifespan of the system
  • Reduce the chance of a breakdown and prevent costly repairs
  • There will be higher hot water temperatures
  • The boiler and radiators will be much quieter
  • The system will become more reliable