Power Flushing

Central Heating Systems

Central Heating Systems include a Boiler, Radiators, and interconnecting pipework. These systems are filled with water which is heated by the boiler and circulated by a pump to all the radiators. Water carries dissolved oxygen that reacts with the metal in the radiators and pipework to form metal oxides. This water can also have high level of limescale and other minerals that come from the water supply for the house. Over time the level of these impurities can increase and cause problems for the heating system. These impurities can form deposits inside radiators that can reduce or block the flow of hot water to these radiators. These impurities can form a layer on the inside of boilers and reduce the efficiency of these boilers. If left unchecked this layer will grow and the boiler will start to make noise when it is running.


What Is Powerflushing

Powerflushing is a method to clean the inside of the Central Heating System including Boiler, Radiators and pipework. A combination of chemicals and a Powerflusher are used to dislodge deposits and blockages in the heating system. This can be done without having to disconnect and remove radiators. When completed the Heating System will be clean and the old water replaced with clean water. A water conditioning chemical will then be added to maintain the condition of the system following the powerflush.

Useful Links

Power Flush Association

Reasons to Powerflush

Boiler Manufacturers specify that Powerflushing should be performed when a boiler is installed. The warranty is void if the boiler fails for reasons relating to problems with the central heating water. The company engineers can test the water to find out if a powerflush was done on the Heating System.

Powerflushing a Heating System and adding a Conditioning Chemical (Inhibitor) can prevent a number of problems. These problems includes:

    • A combination of disolved oxygen and impurities in the water can cause corrosion on the inner surfaces of radiators and boiler. This corrosion can continue to the point where leaks will develop in the radiators or the heat exchanger of the boiler.


    • Black Oxide Sludge forming and blocking the flow of hot water to radiators. Radiators will be cold at the bottom and hotter at the top.


    • Black Oxide Sludge and Limescale can build up on the inside surface of the boiler heat exchanger. This will reduce the flow of water through the boiler and reduce the heat transfer at the boiler heat exchanger. Boiler efficiency can be significantly reduced. If this buildup continues the boiler will overheat and make knocking and kettling noises. The heatexchanger will then need to be replaced.

Black Oxide Sludge deposits inside radiators and limescale buildup inside boilers reduce the overall efficiency of the heating system.



Sustainable Energy Authority of Ireland


Oil Firing Technical Association (Registered)


Electrical Contractors Safety & Standards Association(Registered)

Be Carbon Monoxide Aware

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