'Powerflushing', 'Jet Flushing' & 'Hard Flushing'...



...are all expressions used (in the heating trade over many years) to denote the process by which heating systems are forcibly cleansed using water at high velocity, but low pressure, so that no physical damage is caused to the system.

The process can be made even more effective with the addition of powerful cleansing and mobilising agents such as FX2 and HYPER-FLUSH, from Kamco.


The objective is to restore systems with circulation and boiler noise problems (caused by sludge and corrosion deposits) to optimum operation. Power flushing removes these deposits and the problems that they cause. 


Power flushing, in conjunction with SYSTEM PRE-CLEAN, is also an excellent way to pre-commission clean new heating systems, to remove excess flux, swarf and other debris, and the grease and oil used to prevent rusting of components before use.


It is prudent to power flush a heating system immediately before fitting a new boiler to an existing system to prevent possible future problems. In fact Manufacturers now insist that a Powerflush is carried out before a new boiler installation to validate the warranty they provide through the 'Benchmark' scheme. Many systems are found to contain corrosion and sludge, even if no flow problems have yet shown themselves.


Existing debris is often mobilised by alterations to the system/piping and the increased efficiency of the new boiler, and may then accumulate in the boiler heat exchanger, causing noisy operation, reduced efficiency and, in extreme circumstances, failure of the boiler. The high efficiency and compactness of modern boilers, developed to minimise fuel costs and pollution, means that they are more susceptible to problems caused by debris in the system water.



The CLEARFLOW power flushing process is a versatile, easy to use and highly effective method of flushing heating systems. By utilising CLEARFLOW system flushing pumps, heating systems can be purged of sludge, scale and corrosion deposits with minimal dismantling and disruption.


How does it work?

The CLEARFLOW power flushing pump is simply connected into the heating system, either across standard circulator pump couplings, across the tails of one radiator, or wherever most practicable. The powerful flow, combined with instantaneous flow reverser device, will dislodge and mobilise deposits and corrosion which resist traditional system cleaning methods.

Once the corrosion and sludge deposits have been loosened and mobilised, fresh clean water is forced through the heating system, pushing the contaminated water out through a full bore dump valve to waste. During the CLEARFLOW process, radiators are individually flushed, without removing or disconnecting them from the system, by directing the full output of the pump through each radiator separately.

At the end of the flushing process, the system contains fresh clean water and reinstatement of the system to normal operation takes only a short while.

System flushing will not remedy design or mechanical faults, which should be rectified, but in many cases it will cure the problems caused by these.


What's the difference between a descaling pump and a power flushing pump? Can a descaling pump be used for power flushing?

Most smaller descaling pumps are not powerful enough to effectively flush a central heating system. They don't have the vital flow rate or the pressure needed to maintain flow against the resistance of the heating system.

Power flushing pumps have not only been constructed to purge the system with fresh water whilst dumping the contaminated water, but are also supplied with flow and return hoses, dump and water inlet hoses, valves to isolate them from the system, adapters to speed connection into a system and a significantly higher performance rating.





During the procedure an 11,000 gauss magnet is used as a means of capturing magnetite that's flushed from within the system, a fantastic visual display to show you - the customer - exactly the cause of any issues you may be experiencing.


More examples below of how much black sludge (magnetite) can be removed from the average domestic central heating system, and also how clean your feed & expansion tank will be left on completion of the flushing process.