What is a Powerflush?

Powerflushing is the removal of iron oxide sludge (dirty water in boiler and system) by means of a machine, connected to a central location. The two best places to connect the macine are where the central heating pump is fitted, or onto the feed pipes to the gas boiler. (Too many installers incorrectly connect the powerflushing machine onto a radiator fed by tiny pipe, for convenience because it’s in the hall, or by the back door. Straight away, this reduces the effectiveness of the powerflush, as the flow through the machine is governed by the pipework sizing of the radiator). Chemicals are added to the system to loosen the debris in the system. This is normally done in day, or ideally at least a week before the flush is done. Any remedial pipework alterations are now also carried out before we do the powerflush.

Signs You Need A Power Flush

With annual boiler servicing and regular maintenance, a power flush should only be required every five years. A power flush should always be conducted before fitting a new boiler, but don’t worry, we include a power flush with our boiler upgrades as standard. Any of the following could be a sign that your central heating system needs a power flush:

Inefficiency and lost heat – Poorly maintained heat systems can cause sludge, deposits, rust and debris to build up in pipes, radiators and the boiler. These blockages restrict the flow of water throughout the heating system, in some cases preventing heat from reaching all areas. This means lost heat and wasted money.

Little or no hot water – Blocked pipework and/or heat exchanger due to excess build up could also be the reason for your heating system producing little or no hot water.

Cold spots on radiators – If your radiators are cold at the bottom but hot at the top, your heating system could have a sludge problem. Cold spots are caused by the build up on iron oxide sludge, this collects at the bottom as its heavier than water, which restricts to the flow of hot water.

Dirty water when bleeding radiators – Bleeding your radiators can help improve heat cirulation and convection. However, if the water is discoloured when bleeding your radiatiors, this could be a sign your heating system needs a power flush.

Pump or valve seizure and/or failure – Black oxide sludge increases wear and tear on the shaft and bearings, which is the most common cause of pumps seizing or failing completely. A stuck valve could result in a very inefficient radiator.

Hidden signs – It should also be noted that even if you’re not experiencing any of the above, your heating system could still be building up sludge and debris. As recommended, you should power flush your heating system every five years to prevent build up and inefficiency.

Talk to us about your power flushing needs or make queries about our services by calling 01782 822 887. A knowledgeable staff would love to inform you about everything you need to know. You may also enquire by sending email to info@pldodd.co.uk or by filling out this website’s enquiry form.


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