Powerflush debris

What is lurking inside your boiler, pipes and radiators ? Could Powerflushing be the answer?

If you have some cold radiators or cold patches on your radiators you could have a problem with debris collecting in your central heating system, radiators or Gas boiler.

What is the problem ?

Sludge often forms  as a result of lack of corrosion inhibitor added to, or maintained in the system. Sometimes if your system is drawing in air say from an older, open vented system header tank. This fresh oxygen can increase the amount of corrosion of the radiators. Not only could this block the system and stop it from operating efficiently, but it could also lead to pin-holes in the radiators. Leaking radiators are expensive to replace and obviously leaks can cause damage to your property. If you have had this problem, occasionally it will show it self during the power flush. This is not the Engineers fault and he or she will be best placed to fix the problem for you.

Modern energy efficient boilers have much smaller pipes and channels within them and much more complex parts. Debris can have a devastating effect on these boilers. The secondary heat exchangers in Combi boilers in particular can block up through no fault of the boiler manufacturer, requiring either a specialist clean out at service time, or replacement. If your hot water runs very hot then cold, you could be experiencing this problem. My advice is to speak to your Engineer as soon as possible.

If the problem has been left to the point where pipes are completely blocked, then sadly Powerflushing will not magically restore your heating system. There has to be some flow for the process to work, so don’t leave it til its too late! Sometimes there can be leak problems too with old radiator valves that have not been turned for years, but better for this to happen with en Engineer present than while you are away for the weekend!

The Powerflushing process

Before the Powerflush we inject chemical cleaners into the system, typically up to 2 weeks before the flush to loosen and mobilise sedimented debris. On the flush day, we connect a huge pump to your heating system which is used to flush each radiator in turn at a much higher speed than normal and in both directions. This is crucial to remove the build up of debris that has formed as the water has flowed in one direction. We then flush out the system with clean water, finally leaving it with corrosion inhibitor to reduce the amount of corrosion that occurs in the future.


Often nowadays, we fit a magnetic filter unit, like Magnaclean to keep up the good work after we have flushed. Much of the debris within the heating system is rust particles or magnatite resulting from corrosion of the inside of the radiators. This debris is attracted to the strong magnets in the filter unit and remains there for your Heating Engineer to clean out each year when he is servicing your boiler. A great way of maintaining clean water in your heating system for years to come.

After Powerflushing, it is important that the system is balanced properly. In simple terms, when the heating water is pumped round the system it’s lazy and will go the easiest way round, avoiding those difficult, far away radiators. Balancing the radiators evens out the effort required to heat up each radiator ensuing all are warm and doing their job.