Central heating systems need to be serviced annually for many reasons, and one of them is that your
system could be costing you more money than you need to.
Signs of a problem with your heating system
Are you noticing that your radiators are not as hot as they once were? You might have turned up the
thermostat on the boiler to increase the heat output to no avail. Perhaps you notice that there are cool
spots on the radiator? Bleeding the radiator (the process of releasing trapped air inside the radiator)
makes no difference. And, in fact, there is no air to release. This is a sign that your radiators may be
full of sludge. Another sign is noisy radiators. Clanging and gurgling. These are not healthy signs of
an efficient system. This is usually a sign that there is a build-up of black thick sludge in the system
with hot water struggling to move efficiently around the central heating system.
What causes sludge to form?
When oxygen enters the system during a top up of the system or when the system is emptied and
refilled, dirt and debris mixed with water and this oxygen causes iron ore sludge to form. This is called
magnetite and it can have a detrimental effect on your boiler, pipes and radiators if left. It could lead to
a boiler breakdown and you will pay more for heating bills than you need to.
Up to 36% loss of heat can occur if the sludge isn’t dealt with. Noisy radiators with gurgling sounds
are tell-tale signs that your central heating system needs to be cleaned to restore it to optimal health.
How can I get rid of the black sludge?
A power flush is a process of cleaning the sludge out of the central heating system restoring it to full
health again. This should be undertaken by qualified heating engineers so that no damage occurs to
your central heating system.
A power pump will force a large volume of water through the system and by reversing the flow of
water can dredge up the sludge and push it out the system. Afterwards, fitting a magnetic filter will
prevent the build-up o