Power flushing

Just one of the services we provide at HEAT-IN LTD is the power flush service which effectively and thoroughly cleans out your central heating system, allowing it work at its optimum level again.

Why does your central heating need a power flush?

Over time, air gets into the central heating system which results in a sludge of black iron oxide building up on the inside of radiators and pipes etc. This effect actually begins to corrode the system from the inside and often results in pumps and valves failing. Eventually, the efficiency of the system diminishes and valuable fuel is wasted.

What does the power flush do?

Our HEAT-IN LTD plumbers will connect all the necessary equipment (such as the latest kamco power flush machine and a magnet filter) to the pipe work of your central heating system. In order to connect it, we’ll have to remove the pump itself or one of the radiators but once this is done, the whole system can then be flushed without disturbing anything else at that time.

The aim of the flush is to remove all of that sludge that has accumulated, so when the machine is set up, water flows to the magnet filter from the radiators and sweeps up all the iron oxide before it has a chance to enter the boiler and the heat exchanger. The boiler is then turned on, once we have added a chemical (phosphoric acid) that helps to remove all the rust from the system.

We are able to detect any areas of rust (which are usually cold) thanks to our infrared thermometers which can measure the surface temperature of the radiators. The flushing causes a vibration within the radiators, thus removing any spots of rust.

The process is repeated, step by step to each radiator. Eventually, clean water is flushed through all the pipes until we receive neutral readings in the water once again. If needed, we will usually add some neutraliser to combat any chemicals remaining in the system. In addition a rust inhibitor will be applied and sent through the central heating system.

Once the job is complete, all equipment is removed and the system returned to working order at which point we check the radiator balance to ensure even distribution and optimal performance from your system.

Are there risks associated with power flushing ?

Yes. Much like when any remedial work is undertaken upon Plumbing, Heating or Gas systems within a property there can be unseen errors highlighted by modern processes.

Leaks from weak plumbing joints or radiators with pinholes may be caused by corrosion.

These leaks would have previously been plugged by the debris and sludge within the system or have even just been dripping at such a slow rate they are not seen by the customer.

Once flushed and clean these problems can become more obvious.

However the risks of this are relatively low, with some installers reporting that around 1 in 70 radiators generated leaks after a Power-Flush.

These faults would become obvious sooner or later anyway so it is actually better to have them highlighted by a qualified installer.

What if I don’t bother power flushing ?

If you do not bother to Powerflush a new installation it is guaranteed that before long the new boiler or pipework will start to attract sludge and debris from the system.

Unfortunately this can and will lead to:

The boiler locking out
Cold spots in radiators
Poor Efficiency
Radiators needing frequent bleeding
Repeated pump failures/corrosion deposits in pump casing
Strange and unpleasant noises from the boiler
Even worse is the fact that a Boiler manufacturer will invalidate a warranty if a new installation is found to have not been Powerflushed when the new boiler was installed.


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