Power Flushing

A power flush is a cleansing process which aims to remove deposits of sludge, rust and any other debris from your central heating system. These contaminants, if left in, can seriously affect the efficiency of a heating system. In severe cases a power flush is the only option available.  Before you decide to have a power flush on your heating system there are certain signs you can check for. These include excessive noise from the boiler and central heating pump, cold spots at the bottom of radiators, the heating system taking too long to reach temperature and discoloured water when the radiators are bled. It is also recommended that a power flush is carried out if you intend to connect a new boiler replacement to an old heating system. This is because most new boilers are condensing and any contaminants already present in the heating system can quickly damage the internal pipe work of the new boiler.

The overall aim of a power flush is to restore the full circulation of water around the central heating system, however, it can also eliminate noise from the boiler and the pump as well. This means that the entire system has to be flushed in order to get the best results. Please find below a breakdown of what is done during one of our power flush’s.

Before and after shots are taken of each radiator with our FLIR thermal imaging camera.
Cleaning chemicals are added into the radiators and the system is then run for 30 minutes.
-The heating system is drained and a radhammer used to loosen the deposits within.
-The power flush machine (Kamco CF40 EVOLUTION) is connected to the heating system either by the circulating pump or directly to system pipework.
-A magnetic power flushing filter is also connected to remove circulating black iron oxide contamination from the flushing water.
-Heated water mixed with cleaning chemicals is flushed through the system until the dump water runs clear.
-Neutralising Crystals are added to the power flusher’s tank and circulated briefly to ensure neutralisation of any residues after use of chemicals.
-The heating system is re-pressurised and inhibitor added to protect against the damaging effects of corrosion and limescale to maintain the energy efficiency of the boiler and extend system life.



On average a full power flush will take around 6 to 8 hours, older more heavily affected systems can take considerably longer. We will not power flush a system that does not need it or may be damaged by the process so a power flush is subject to survey. Please note: We highly recommend installing a magnetic filter to your heating system after a power flush such as a MagnaClean or a Fernox TF1. This will prevent the build up of deposits in the heating system. With every power flush we will be happy to fit a magnetic filter FREE OF LABOUR CHARGE!