Why do radiators have cold spots or not get warm enough?

Over time, the water in your central heating system deposits dirty particles that build up to form sludge in your system.  This build up of sludge and rust can cause annoying problems, such as excessive noise in the system.  Some radiators might take a bit longer to heat up.  It can also cause major issues like cold spots (particularly the bottom of a radiator), leaks, radiators not getting warm at all and even boiler breakdowns.
To prevent this from happening, a power flush of the system is recommended roughly every 6 years.  This will extend the life of your boiler and heat your home more efficiently and therefore cost effectively.   We also recommend a power flush on a system prior to installing a new boiler.

You will probably be able to tell that it’s time for a power flush if you are experiencing any of the above issues with your system, boiler and radiators.  Before it gets to this stage, you might notice that when you bleed a radiator, the water that escapes is dirty, or no water comes out at all.  Even so, we will always have one of our Gas Safe registered engineers check the system to make sure the power flush is necessary.

What is a power flush?

A power flush uses a chemical solution specially created to cleanse the internal workings of your central heating system.  It removes any sludge in the system, clearing out blockages and allowing clean water to reach all parts of the central heating system.  A pump pushes the chemical through the system, subjecting each radiator to a clean out.  The whole system is treated with an inhibitor to help reduce future sludge build up.
It usually takes between half and a full day to flush the system.  This depends upon the number of radiators attached to it.  If you have underfloor heating this will also affect the duration.  Therefore, we always ask that you leave a full day for the power flush to take place.  However, if you have a combi boiler or sealed system it will take less time.  This is because there is no need in these instances to cap off the cold water supply feed and expansion piping that comes with a standard or vented system.

Our fully qualified and experienced heating engineers will start by flushing the radiators and boiler with water.  They remove as much build up as possible before adding the chemicals into the hot water from your boiler directly into the system.  Next, they work systematically through your property, ensuring the flush reaches all heat exchangers and thermostatic radiator valves.  This removes all sludge and debris.  Following this, a system drain is carried out and a neutraliser is added to ensure all traces of the chemicals are removed from the system.  Checks will be carried out on the water.  Finally, the inhibitor is added to the fresh system water to help prevent future sludge build up.

How much does a power flush cost

Every home is different as the number of radiators within the central heating system changes depending upon the number and size of rooms.  This means it is impossible to provide a fixed price for power flushing.  We can however carry out a full system flush from £300. The flush is guaranteed for 5 years.

Book a Power Flush

If you think your system would benefit from a power flush, get in touch and we’ll book you in.

Contact us today
central heating power flush