In partnership with Avenue Property Services Group LTD
System Flushing
Avenue Heating System Flush will improve your central heating system, help you use less energy and keep you warm at home.
System Flush
Power Flushing flushes your central heating system using a three-pronged process of combining the use of chemicals, heat and agitation to dislodge, move and extract out the sludge and dirty water that is inside your central heating system.
The method that we normally carry out doesn’t use the “traditional” method of power flushing a central heating system, which can cause old pipes to leak due to high pressure being pumped into the central heating system.
As a proud accredited company for Adey Magnaclense, we are able to offer a one-off cleanse, using the most up-to-date technology to ensure your radiators heat up correctly. This process helps to prolong the life-expectancy of the whole of your central heating system, keeps your heating bills down and reduces the risk of breakdowns.

Everything you need to know about getting a System Flush
Watch our short video to learn more about our Avenue Heating System Flush, how it works and why getting one might help improve the performance of your central heating system.
Why you may need a System Flush
A Powerflush helps deal with heating problems that you can’t always see.

Reduced Efficiency
Sludge, rust and limescale causes leaks and blocked pipes. Dirty water in your pipes causes heating problems and reduces efficiency.

Cold spots on your radiator
Sludge build-up causes cold spots in your radiators. This means they have to work harder to heat a room and you waste more energy.

Boiler Breakdowns
A clogged boiler and pump causes breakdowns. 87% of boiler breakdowns are due to dirty water in your heating system.
Save energy, save money
What are the benefits to having a central heating power flush?
- Heats your home faster
- Uses less energy to heat
- Protects your boiler
- Prolongs the life of your system
- Saves money on gas and repairs
- More efficient heating system
How does a System Flush work?

Before a Power Flush
The sludge in your radiators creates cold spots so the heat can’t flow around them effectively.

During a Power Flush
We’ll use a machine and three-step chemical process to thoroughly clean out your boiler, pipes and radiators, and replace dirty sludge with clean water.

Boiler Breakdowns
After the System Flush has removed sludge from your pipes, radiators and boiler, your system should work much better.

Future Protecting your Central Heating
When boilers and heating systems are power flushed, they are restored to their usual level of efficiency. If your system is clogged up with sludge and dirt over time, it cannot perform to its maximum potential to heat your home. A heating system clean provides your home with many benefits and savings.
Once your heating system has had power flushing, it’s crucial that it remains like this to avoid additional expenses in the future. Inhibitors are added as part of every flush, but can dilute overtime as a result of small leaks or refilling radiators.
To determine whether power flushing is the right solution for you, our professional heating engineers are happy to talk to you about the process with you, examine the system and suggest the best way forward.
System Sludge!
A by-product of the chemical reaction between metals and liquids is sludge. As this deposit builds up in the bottom of radiators, as the water flows around it, it slowly causes cold spots on radiators and blocks piping.
Your heater’s boiler and pump are put under stress when this occurs by restricting the flow of circulating water. As a result, it is less effective, less efficient, and will not last as long.
By having central heating power flushing you can clear the sludge built up in your system over time.


How to book a System Flush
- Book a free appointment and one of our engineers will pop over and check your central heating system, then provide a fixed-price quote
- If you decide to go ahead with a Powerflush, we’ll help you book an appointment (it can take around eight hours to complete a System Flush)
If you would like to arrange your free boiler survey please fill in this short form and one of the team will be in-touch!
Please note the quickest and best way to contact Avenue Heating is via this form.
Get in touch
Avenue Heating
Phone : 020 3137 3333
Avenue Heating Suite Unit 107 186 St Albans Rd Watford WD24 4AS
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Need to know more about system flushing?
Avenue Heating will flush your heating system using a three-pronged process of combining the use of chemicals, heat and agitation to dislodge, move and extract out the sludge and dirty water that is inside your heating system.
The type of process that we mainly carry out does not use the “traditional” method of power-flushing a heating system, which can cause old pipes to leak due to high pressure being pumped into the system. All full demonstration of our whole process can be found in the below video!
As a proud accredited company for Adey Magnaclense, we are able to offer a one-off cleanse, using the most up-to-date technology to make sure your radiators heat up properly. This process helps to increase the life-expectancy of the whole of your system, keeps your heating bills down and reduces the risk of breakdowns. Prices start from £350.
There will be a number of signs that you need a system flush, below is a list of the most common signs that you may need to have your central heating system flushed:
- Banging noises from your boiler
- Kettling noise coming from your boiler
- Cold spots on your radiators, particularly on the bottom
- Your boiler breaks down and regularly needs restarting
- Your central heating pump or boiler are making excessive noises
- Your central heating system gradually starts to take longer to heat up
- Some of your radiators take longer to heat up than other
- When you bleed your radiators the water is dark or black
- When bleeding your radiators no air comes out
- Your radiators do not get warm even when the boiler is on
It is recommended that you should have your heating system flushed every four to five years.When you have a new boiler installed, depending on the water quality of your system, it may be necessary to carry out a full flush at that point.
The time it takes to flush a system depends largely on the size of the property and how blocked or dirty the system is. The larger the system and the more sludge there is, the longer it will take. We take pride in the quality of our work and will flush your system for as long is required to clean the system and will work on each individual radiator to specifically ensure each one is clear of blockages.
To give an indication, a property with a system consisting of fifteen radiators will take a whole day to complete.
It is advised that your flush is carried out by a qualified professional. All of our engineers are fully qualified and take part in ongoing manufacturer training to ensure that their skills and knowledge are always up to highest of standards.
The cost of a flush of your heating system varies and is individually quoted to reflect your home’s unique system composition.
To get a no obligation quote for the cost of flushing your heating system, call us today on 0203 137 3333 or just click below and we will contact you to discuss your requirements!
FAQ
Your most Frequently asked boiler questions
Don’t see your question below? Get in touch using the form below, we’d love to answer any questions you have.
- Call the National Grid UK on 0800 111 999, any time, day or night!
- Extinguish all naked flames and do not smoke or light anything.
- Do not touch any electrical switches, turning on or off.
- Turn the gas off at the meter (generally outside the house).
- Open all doors and windows.
- Get everyone out of the area
- Unusual whistling, banging, or tapping noises.
- Higher than average gas usage indicates the boiler is not performing efficiently.
- The pilot light or flames are orange/yellow in colour, which should normally be blue.
- It will show a high system water pressure instead of continuing at a steady pressure
Boiler installations vary. It depends on the work that needs to be done. If you have a combi boiler and we are installing a new combi boiler in the same place, this will take approx 4-6 hours.
If you are converting from a system boiler to a combi boile, this will take approx 2 days.
If you would like your boiler relocating to a different part of your home, you need to add another 1/2-1 Day onto the work to install the boiler
YES – It is recommended that boilers are serviced annually and you hold a gas safety certificate for your home
- You can catch boiler problems early before they develop and avoid the need for boiler repair
- It is cheaper than replacing your boiler
- It will save money on your energy bills
- You can keep your boiler safe
- Your boiler will stay under the manufacturer warranty
This depends on the type and the make of boiler in which you need. Our expert boiler installation engineers will make an assesment of your home and lifestyle and suggest the right type of boiler for you. you will then have a choice of brands of boiler to choose to suit your budget