Power flush is a term which has been used in the gas and central heating trade for many years now. A few years ago, it became a statutory part of the boiler upgrade process. It is a term used to describe the means by which wet central heating systems are cleansed, by flushing water through a system at a greater velocity, but low pressure, so no damage is caused to the system being worked on, by pressure. The process is often made even more effective by adding powerful cleansers to the flush.
The overall objective is to restore systems which have experienced poor circulation, excessive pump replacements, and boiler noise problems, mostly caused by sludge and corrosion deposits. Power flushing removes these deposits and so eradicates the problems they are associated with.