Comparing types of central heating flushes
Comparing types of central heating flushes
There are a few different ways of flushing your central heating. In this article we will be comparing some of them.

At A-Rated Powerflush we get asked to carry out many types of flushes but we only use the PowerFlush method. We can not certificate and warranty our flushes as we can not guarantee results and the outcome.

Cold Mains Flush:

A cold mains flush is what it says on the tin. Using cold water mains pressure to flush out your heating system, commonly used when people are installing a boiler quickly in the day.

Chemical Flush:

After installation of a new boiler a chemical additive is added to the heating system, left in from 1 hour to 2 weeks of circulation, then the system is drained. The downside of using this method is, the chemical makes the debris ‘portable’ this is going to then run through the new boiler potentially getting caught inside it and trapped.


A Thoroughflush is the same as a cold mains flush, using a manual valve set to change the flow of the water, sending the flow into the return and return into the flow visa Versa, usually left running when installing a boiler.


The magnacleanse method is the same as a chemical flush, but with added magnetic catchers similar to the filters you have installed on the return of your boiler but double the capacity it’s fitted inline to catch the debris, this method uses the boilers new / old pump or external central heating pump to rely on pushing the water around the system.


The PowerFlush is currently the best method at cleaning central heating systems. A Powerful PowerFlush pump designed for clearing blockages and flushing central heating systems is used along side cleaning Chemicals, strainers to catch the non magnetic particles and PowerFlushing magnetic catchers. This method takes a full day anywhere between 6 - 12 hours depending on system size and layout. Pre installation of a new boiler / after a new boiler that’s been fitted and been flushed by the methods above if a warranty call has been issued due to dirty system water. We advise having a PowerFlush every 6-7 years and water treatment analysis every year to prolong your heating systems lifespan before problems occur.