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Powerflush vs. Chemical Flush

Having your radiators and boiler flushed every so often is important to ensure that your heating system continues to operate at its full potential. There are two types of flushes available: the powerflush and the chemical flush. Here at Aren, we can carry out either flush service to your system and in this post, we explain the main differences between them and what type of flush is recommended for you on different occasions.


What is a powerflush?

A powerflush is an effective and thorough way to remove the build-up of dirt, sludge, rust, and debris that has built up over time in the boiler pipework and radiators. It is essentially a great way to deep clean your central heating system to help give it a new lease of life. A powerflush relies on high pressure to flush the system which is where it differs from the chemical flush. Please see our ‘powerflush’ page for more information on this service.

What is a chemical flush?

Similar to a powerflush, a chemical flush also sets out to remove the build up of dirt, sludge, rust, and debris that is within your heating system. The main difference being the way the flush is carried out. A chemical flush uses gravity to clean the system with the aid of chemicals, hence the name. The system is then refilled with clean water and inhibitors once complete. Please see our ‘chemical flush’ page for more information on this service.

How often should I flush?

We recommend that you have a flush carried out on your system every five to six years to ensure your boiler remains clean and your radiators and heating continue to work as you expect. Having a flush every few years can help to extend the efficiency and lifespan of your boiler, saving you money in the long run.

What type of flush is best for my heating system?

We recommend either type of flush as both are reputable ways to clean your boiler and heating system and ensure your radiators get to the correct temperature. The main thing to consider is how ineffective your heating system currently is.

We recommend a flush of your system every few years but if your radiators are heating up well all over and you are not noticing any issues then a chemical flush should be sufficient. If, however, you have lots of cold spots on your radiators and the system has not been cleaned in a long time we would recommend a powerflush to thoroughly clean the system. The chemical flush is the lower cost option out of the two as it takes less time to carry out.

All our heating engineers are Gas Safe registered and are fully proficient in carrying out powerflushing and chemical flushes for your complete central heating system.


Fancy a flush? Please head to our Contact page and fill out the online form or send us an email. Alternatively, you can call us directly on 020 8287 7194 to help get your system flowing efficiently again.

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