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Powerflushing service Glasgow Hamilton

Power flushing Service FAQ - HeatTech

In this blog post by HeatTech in Hamilton we aim to cover a few basic questions asked by our customers regarding the power flushing of central heating systems. We will discuss the benefits of having your heating system power flushed, what the job entails and how often it should be carried out and how much you can expect to pay to have a power flush carried out.

When Is A Power flush Needed?

Power flushing is a procedure carried out in order to remove magnetite, often referred to as "sludge" from your central heating system.  Sludge forms over time within heating systems that have not been adequately protected with corrosion inhibitor and can cause premature failure of heating system components such as pumps, valves and the central heating boiler its self. Sludge can also cause radiators to not heat up evenly, often getting hot at the top and staying cold at the bottom or leaving a large cold spot in the "low flow" area around the middle of the radiator. Sludge formation is more common in open vent heating systems that are filled via a small header tank due to the system being open to the atmosphere. In lots of cases however we find a new high efficiency combi boiler has been fitted onto an old heating system and has not been flushed properly after installation. This can play havoc with the new boiler which are particularly sensitive to dirty system water. Manufacturers are increasingly carrying out water quality tests on appliances before carrying out warranty repairs and rejecting repairs on boilers that fail. If you are experiencing problems with your heating system such as cold spots on radiators, failing system components or excessive noise, you may need a power flush to be carried out. A lot of heating insurance providers such as Scottish Gas are now insisting proof of a power flush be provided before covering some systems.  The picture below shows a radiator with excess sludge through our thermal imaging camera, the heat can clearly be seen through just the top part of the radiator in yellow, the large pink section shows a large cold spot.

What Is A Power flush?

Once excessive sludge has been found within a heating system the next step is to start to take steps to remove it. Heating system cleaning chemicals are added to the system to soften the sludge and make it soluble, this is typically done a few days before the flush so the chemical has time to work its way around the system and properly penetrate any areas of compacted sludge. To carry out the flush a power flushing machine is connected to your heating system. This machine moves large volumes of water round your heating system much more quickly than your standard heating system pump can, this ensures all areas of the system are reached, even those that your normal heating pump can reach. The power flushing machine also has the ability to circulate water through your heating system in 2 directions, this provides a scrubbing motion to agitate sludge deposits and get them moving so they can be removed. Once the sludge is mobile and been agitated the machine has a function to dump the dirty water into a drain so fresh clean water can be added. The process is repeated through each radiator till the water coming from the system is nice and clear and free from sludge. We use a Norstrom ProFlush machine as pictured below.

How Often Do I Need A Power flush

Once carried out properly a power flush is not something that should need to be done for many years after. Once the flush has been carried out a corrosion inhibitor chemical is added, this provides protection within the system from future sludge formation. Inhibitor levels should be checked annually and topped up where necessary, care should be taken to replace any inhibitor lost when they system is drained during future maintenance. For added ongoing protection it is highly recommended that a heating system filter be added as part of a power flush. A heating system filter is a filter that is attached to the heating system, preferably on the return pipework that catches and contains any small deposits remaining in the system or that forms over time. These are also cleaned and checked annually as part of a boiler service. 

How Much Does A Power flush Cost?

Prices for a power flush can vary depending on location, heating system type and how many radiators are in your property. As a rough guide at HeatTech we charge £395 for a power flush on a heating system with up to 7 radiators. For systems with upwards of 7 radiators we will happily provide you with a free written quote. You can contact us via the online form on this page and we'll be straight in contact with you. We carry out power flushes using the best quality tools and chemicals in Hamilton, Glasgow, East Kilbride, Bellshill, Motherwell, Wishaw, Uddingston, Bothwell, Strathaven, Blantyre, Airdrie and beyond. 

For more information on any of the gas engineer or heating engineer services provided by HeatTech in Hamilton and across Glasgow please visit our homepage