To contact me to talk about flushing your system, call me on 07976 806078 or email me at firstname.lastname@example.org. I work in the North West London area and out as far as Reading in the Thames Valley corridor.
An Introduction to Powerflushing
The galvanic series (or electropotential series) determines the nobility of metals and semi-metals. When two metals are submerged in an electrolyte, while electrically connected, the less noble (base) will experience galvanic corrosion. The rate of corrosion is determined by the electrolyte and the difference in nobility. The difference can be measured as a difference in voltage potential. Galvanic reaction is the principle which batteries are based on. (Wikipedia)
I earn my living (And finance boat-building) nowadays by repairing or replacing faulty boilers and powerflushing heating systems. To learn more about the process of powerflushing please read on or visit www.kamco.co.uk
As soon as a newly installed heating system is filled with water - the corrosion process begins. The steel from panel radiators and the cast heat exchanger of the boiler are slowly but surely dissolved by the action of electrolytic corrosion. The dissolved particles fall to the bottom of whichever radiator they happen to be in and over the years build up to cause cold spots in the bottom of radiators, or block them completely or at worst cause corrosion and pinholes.
Newer systems which are heated by a combination boiler can present different problems. The small plate heat exchangers that produce the domestic hot water can become partially blocked by these corrosion deposits. This causes different symptoms. The partial blockage slows the passage of water though the heat exchanger causing the boiler to overheat and shut down. After a few seconds the cool water resets the boiler which then starts to produce hot water again. This cycle continues and makes for an uncomfortable shower. To replace the heat exchanger solves the problem for a time, until the corrosion deposits gravitate to the new heat exchanger. And they most certainly will!
The only sure answer is to have the whole heating system completely cleaned by the Powerflushing process. This takes about 5-6 hours depending on the number of radiators and the type of system. Its something like kidney dialysis using filters to remove the sediment from the water in the system. The system is never drained down but each radiator is individually cleaned and the boiler is cleaned along with each radiator. The system then has a corrosion inhibitor injected into it to help prevent further corrosion in the future.
The filter I use for removing the sediment is designed round a very powerful magnet.