Power Flushing

What is Power flushing?



Power flushing is using a powerful pump to force water quickly and at low pressure around the central heating pipes and radiators so that the moving water picks up deposited sludge and dislodges sludge which is stuck in the system. Cleaning Chemicals are used to help dislodge the deposits. It reduces the time taken and helps to get more complete removal by using both physical and chemical actions. It is also known by "Jet Flushing" and "Hard Flushing"

It is currently the most effective way to clean out central heating systems.

The water in the system is changed until tests show that it is almost as clean as your tap water that you drink. Then the clean system is ready to be treated with a good quality corrosion inhibitor. This treatment ensures that corrosion is prevented for much longer.


Proflush Junior Power Flushing  Machine




What is Water Treatment?

This is using chemical cleaners and corrosion inhibitors to reduce the speed of corrosion that occurs when metals are in contact with water.Without the introduction of cleansers and corrosion inhibitors a central heating system will start to corrode from day one, even on a brand new sealed system. Fluxes used during the installation can attack the inside of radiators and cause pin holes within weeks if the system is not flushed out with a Pre-Commission cleanser and then treated with corrosion inhibitor.

Why do you need Water Treatment?

So that your central heating system gives you long and good service. You need to minimise corrosion of the system metals to inhibit the formation of scale and sludge that give radiators cold spots or blocks pipes and makes whole radiators cold and overworks the pumps. To stop the growth of bacteria and other nasties.

Where a new boiler is to be fitted to an older system, cleansing is very important in order to remove layers of black sludge (Magnetite) and in hard water areas limescale. If this is not done a High Efficiency boiler with a SEDBUK A or B rating would be brought down to a C or D rating, making the installation impracticable and resulting in early failure of the boiler. This would not be covered by a manufacturer’s warranty in these circumstances. In order to give the system its full life expectancy, water treatment should always be carried out.


Who says so?

The Government through the Building Regulations - Part L refers to the Domestic Heating Compliance Guide. This states that the minimum provision in new and existing dwellings is :

  • Thorough cleaning and flushing out before installing a new boiler.
  • During final fill add the corrosion and scale formulation (Corrosion Inhibitor).
  • To follow guidance given in BS 7593:2006
    • Refer to boiler manufacturers instructions for appropriate treatment
    • Where hardness > 200ppm, treat feed water to water heaters and hot water circuit of combi to reduce limescale accumulation.


The results of best practice in Water Treatment and Powerflushing your Central Heating System:
  • A quieter boiler because of the removal of lime scale build up on the heat exchanger.
  • Hotter Radiators and a quicker warm up from the removal of Black Sludge “Magnetite” and elimination of cold spots
  • A longer lasting system. Pumps will last longer and radiators will have an extended life if there is no corrosion present and suitable corrosion inhibitors are used.
  • Lower fuel bills due to a more efficient system. It costs more to heat solid magnetite than it does water! Estimated that up to 25% savings can be made.
  • Complies with The Benchmark Code of Practice exceeding the BS:7593 2006 standard when installing new boilers on old or new installations.
  • A safer environment when under taking system cleaning. Self contained unit. No taking individual radiators off the wall and struggling to avoid getting black sludge on carpets etc.
  • It costs you less in the long run.

Return from Power Flushing to Home Page