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Power Flushing

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Why Do I Need Power Flushing?

Boiler manufacturers insist that old heating systems be thoroughly flushed before installing a new boiler, and may even make a warranty on this. Only by power flushing can you be sure that a system is really clean to the standards demanded by modern high efficiency boilers and heat exchangers. By using a Clearflow pump, we can cleanse a system to a standard that exceeds BS7593.

Frequently Asked Questions

How to tell if a power flush of your central heating system is recommended ?

Unless it has sufficient corrosion inhibitor, from the day your heating system is installed it starts to deteriorate. The steel and iron components will start to rust. This leads to the formation of magnetite and a build up of sludge which is evident by the water in the system becoming black. As the build up of sludge increases it can block waterways and seriously impair upon the efficiency of your heating system, leading to higher energy bills and ultimately failure of pump, radiator valves or boiler.

If you have radiators which have cold spots at the bottom you probably have a build up of sludge and flakes of rust blocking the waterways within the radiator. If your radiators have cold spots at the top it may just be due to air in the system or it could be caused by hydrogen gas which forms due to a chemical reaction which is a part of the corrosion process. On top of this if you live in a hard water area and your system has not been regularly treated it may well also have a build up of lime scale which only serves to exacerbate the problem. The following are all symptoms of corrosion:

• Black water in the system.
• Radiators requiring frequent bleeding.
• Radiators partially or fully cold.
• System very slow to warm up.
• Noisy boiler
• Central heating pump failure.

Regardless of these symptoms systems 10 years or more old will have a build up of corrosion. If you recognise any of these symptoms then your heating system could almost certainly benefit from power flushing.

How does power flushing work?

Basically its the application of specially formulated cleansing chemicals at high velocity but low pressure to facilitate a thorough removal of all the products of corrosion without causing any damage to the system due to high pressure. The operation will take several hours and once the system has been thoroughly cleansed the cleansing agent is neutralised and a corrosion inhibitor is added to the system.

Why should you power flush your central heating system?

If you are upgrading your system with a new high efficiency condensing boiler then power flushing is essential if you want to realise the published energy efficiency levels of 90% – 94%. Your new boiler cannot be expected to fulfill its potential if your heating system is full of sludge and scale. Modern boilers have much smaller waterways and are therefore far more prone to clogging than their predecessors. Several boiler manufacturers insist that the system is thoroughly flushed as a requirement of their warranty. You will save money on the running costs of your heating system by anything up to 25%.

The alternative method of flushing heating systems ,without a pump , by using chemical mobilising agents followed several days later by  “repeat drain down” procedures is very labour intensive. It requires at least 2 visits, doesn’t get rid of all debris, and problems often quickly return. No matter how good the the flushing agent used, the low rate as system water trickles out through ordinary drain valves means that some debris settles back in the system , with the result that problems return again in short order. Removing individual radiators, and flushing them with a hose outside the house , is equally time consuming , very messy, and has no effect on deposits in pipe work and elsewhere in the system.


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