Plumbers In London company logo. Rapid response Platinum all emergency services is written in blue text with a white background.
Call Today

0208 521 9518


Mon - Sun 24 Hours


Power Flushing London

London’s highest rated plumbing & Heating Engineers

Platinum Emergency Services Ltd Gas Safe License

Licensed & INsured

All our engineers work directly for us. They are both licensed and insured professionals

Platinum Emergency Services 5 Star Google Rating

Plumbing & Heating Pros

20+ Years of experience 5 star rated across Google

michael longmire 689531 unsplash

Best Value for Money

Exceptional service and competitively priced with Platinum quality as standard


“Platinum really will give you great work for a fair price. Highly recommend”


“James was great and super friendly. Efficient and knowledgable. Worth the rate”


“Highly recommended. Easy to communicate with, efficient, stuck to the quoted price”

10% OFF

10% Off Throughout 2020 from Your First Site Visit.

Not Sure if You Need A Power Flush Or Do You Just Need A Second Opinon? Hire London’s Trusted Plumbing & Heating Experts.

(1) Just mention the discount code Power Flushing London/2020 whilst booking an engineer. Click learn more below.

(2) Only available to residents and business within North London or East London.

(3) *Discount codes only apply to the following requested trades: Heating Engineers. Discount available for site visit/inspection only! Does not cover any subsequent site visits for power flushing.


Power flushing London services

Blue broken pipe with the words blocked drains written underneath.

Power flushing London

What is power flushing


Power flushing is a procedure used by central heating engineers to clean a central heating system. Heating engineers use chemicals forced around a central heating system with a specially designed machine that uses high-flow and reverse flow to remove magnetite (sludge). This helps restore a poorly working or complete blocked heating system. 


If you already know the above and below information click learn more for our up to date power flushing price guide and how to book a heating engineer for a site visit.


Why do central heating systems need power flushing


From the initial point, a central heating system is filled with water the corrosion process will begin. All central heating systems are constructed of mixed metals such as steel, copper, brass and many others. All these metals touch one another through the medium of water. Water is the catalyst to the corrosion process but is also a key requirement of heating your home efficiently. 


As central heating engineers, one of our roles is to slow this corrosion process down. We do this by adding chemicals to the water column when required either as part of our yearly service and maintenance checks or when we drain down a central heating  system to work on it. You can not stop a heating system from corrosion but you can maintain it.


Unfortunately unlike cars many homeowners blatantly choose not to maintain their boilers and heating system. When problems such as leaks occur many homeowners quickly turn to Youtube or other self-help forums instead of licensed heating engineers. With the power of videos, many homeowners are lured into a false sense of security thinking they can resolve many boiler and heating system issues themselves.


Coupled with a lack of maintaining heating systems and homeowners filling heating systems or continually topping up heating systems leads to a situation where power flushing a heating system is often required. If the corrosion issue is not dealt with in a timely manner it can lead to irretrievable boiler damage or corrosion so bad that the system completely fails and/or starts leaking in many different areas.


This in turn unnecessarily ends up costing homeowners thousands of pounds. As the old saying goes an ounce of prevention is better than a pound of cure.


plumber icon 02

Central Heating Systems

Other Services 

plumber icon 01

Gas Piping & Repairs

plumber icon 09

blocked drains

plumber icon 04


plumber icon 03

Ways to clean

Power flushing vs Magnacleanse


You may have in your research come across a slightly different method of cleaning a heating system called Magnacleanse™ Adey. Not to be confused with Magnaclean, more about that later.  It is important to distinguish clearly between the two methods of cleaning a heating system as both will clean a heating system but one is much better for certain applications and cleaning of central heating systems than the other.

Magnacleanse is a unit that is also attached to your central heating system. However, instead of using its own power to clean the heating system like a power flush machine, it is reliant on the boiler or system pump for its power and cleaning abilities. 

This immediately can have drawbacks depending on its application. Unlike a power flushing machine. A system pump is far smaller and therefore is unable to exert anywhere near the same volume of water/flow as a power flushing machine through a heating system. In addition, a boiler or system pump can only travel in one direction which means that corrosion and debris in the system is unable to be removed or suspended and trapped in the moving water column long enough to be removed.  Whereas power flushing machines such as Kamco ™  have reverse flow technology built-in. This enables a heating system to be cleaned in both directions.

You, therefore, might be asking what is the point of having a Magnacleanse. Like all great surgeons, a licensed heating engineer has many tools in their armoury. A Magnacleanse uses a mechanical filter and very large magnets to remove as much corrosion debris as possible. Alongside you can also dose certain types of cleaning and protection chemicals as well.  A Magnacleanse can often be far quicker to set up and far quicker to use for an experienced heating engineer.

Therefore for systems that are not too badly corroded they have a bigger cost and time savings. This ultimately makes it cheaper for a homeowner but it will always require a professional heating engineer to determine what tool would be best to use in all instances. Click the link and find out how to book a consultation with a professional engineer Today.  


How can a power flush help me and my heating system


Removal of built-up magnetite and sludge.
Full chemical treatment on the heating system means instant protection.
Up to a 15% energy saving, which means cheaper fuel bills.
Your home will heat up faster. Faster convection throughout your homes heating system also means you get a warmer home.
Seriously reduces the chances of boiler breakdowns and replacement of parts costs associated with boiler and central heating breakdowns.
Prolongs the life of your boiler.
Ensures your boiler manufacturer warranty remains valid. Some boilers come with 10 - 15 years parts and labour warranty. Not servicing your boiler annually or ensuring the heating system is well maintained will void all manufactures parts and labour warranties!
Insurance Certificate

The Benefits of a power flush

Insurance Certificate

The Need For a Professional

Why you should always have an expert carry out a power flush



Do not be fooled by watching a video on YouTube and instantly thinking you have enough knowledge and experience in tackling your homes heating system.  Power flushing a central heating system or a boiler heat exchanger is a complex task littered with many pitfalls. 

There are many ways to set up the power flushing equipment and a heating system will determine the safest manner of setting up power flushing equipment to achieve the best results.

When power flushing a heating system you are dealing with chemicals so apart from the obvious safety concerns. Not dosing the correct amounts of chemicals or knowing how to neutralise and test water parameters can result in either causing yourself or your heating system significant harm.  

As qualified heating engineers, we often have difficulties and problems whilst power flushing central heating systems.  A homeowner will simply not have the experience and knowledge to get around problems that can occur during power flushing.

A licensed qualified and competent heating engineer at all times should only carry out power flushing. If you need help or advise leave this one to the experts [insert link]


How do tell if your heating system needs to be power flushed





In short your heating system likely does not need to be power flushed. It is recommended that a heating system is flushed every 5 years, however, if a system is maintained this is a little over the top. In fact only about 1 in 10 properties we visit results in the need to have a complete or partial system power flush. Plumbing and Heating engineers have other tools and workarounds for some heating related issues that can sometimes negate the need for a system power flush.


This is why as above you always need a qualified and licensed heating engineer to look at the entire heating system and its operation to firstly determine the need for a central heating power flush. 


As heating engineers, we look at many factors on your home heating system to determine the need for a power flush. Below is a list of the most common factors a heating engineer will consider:


  • Inefficiency and lost heat – As stated above a poorly maintained heating system will collect sludge, deposits, rust and debris to build up in pipes, radiators and the boiler over time. These will slowly result in full blockages and/or restrict the flow of water throughout the heating system.  This can prevent heat from reaching all areas of your home or to specific radiators, resulting in lost heat and wasted money.


  • Little or no hot water –  over the last decade’s boilers have dramatically reduced in size. As of today, we are able to install boilers that fit into kitchen cupboards discreetly.  However, the smaller a heat appliance is the narrower the pathways the water has to travel. This results in boilers and in particular plate heat exchanges blocking up faster. Blocked pipework and/or heat exchangers due to an excess build-up of corrosion/magnetite is often the main reason for your boiler and heating system failing to produce little or no hot water.


  • Cold spots on radiators – If your radiators are cold at the bottom but hot at the top, your heating system could have a large sludge/magnetite build-up. Cold spots are caused by the build up of iron oxide aka (sludge). Sludge collects at the bottom and in bigger quantities is much heavier than water. In addition, as the sludge is pushed around the heating system pump it becomes magnetised which results in the sludge lining and sticking to radiators. This in turn restricts the flow and return of hot water around the central heating circuit.


  • Constant bleeding air from your radiators – As the corrosion process is well underway in your heating system you get the reverse effect of the above issue or your homes heating system can have both. Cold sections will now also be present at the top of radiators. In severely corroded heating systems it is not just air that is produced during the corrosion cycle. In fact, the corrosion process often produces hydrogen sulphite. A qualified heating engineer can demonstrate if this is present to you during an initial inspection to determine how serious your central heating or boiler issue may be.


  • Dirty water when bleeding radiators – Bleeding your radiators should be carried out annually as part of your annual boiler and heating system checks. This will help improve heat circulation and convection. However, if the water is discoloured when bleeding your radiators, this is often a sign your heating system needs attention!


  • Pump seizure and/or other boiler part failures – Black oxide sludge increases wear and tear on pump shaft and bearings and all moving parts inside a central heating system. We see this time and time again. Sludge and magnetite build-up causes pumps to be far less efficient which constantly cost you vast amounts of more money whilst trying to heat your home.


Over time all heating systems corrode, however, as responsible homeowners it is your responsibility to ensure you have a well-maintained heating system. That way it will cost far less to run and increases the life of your boiler and other components.



identify problems

Image of a pressure gauge on a plumbing and heating pipe.



Q. How long does a power flush take?

A. Most heating systems can be flushed in a single day 4 – 12 radiators. Larger heating systems will take longer.

Q. I am replacing my boiler. Do I need to power flush?

A. It is always advisable to clean a heating system when replacing a boiler. It will often depend on the condition of the heating system and the current British Standards. However, please remember not cleaning a system that required a power flush will void your new boiler’s warranty without question! All new boilers should be cleaned chemically and flushed in accordance with BS7593:2019.

Q. I have been advised that power flushing a heating system may mean I have to replace radiator valves. Why would I need to do this?

A. It is not the power flushing that will break or damage your radiator valves.  It is the process of power flushing where this becomes a problem on old & frail or just plain cheap radiator valves.  During the process of power flushing, radiator valves have to be opened and closed multiple times.  If they are old and frail or just cheap to start with they can sometimes break in the opened or closed position and sometimes they can start leaking.

Q. I have watched loads of Youtube videos and my local tool company hires power flushing machines. Am I ok to power flush my own heating system.

A.  No. Please read above on why you should always hire an expert to power flush your heating system and boiler.

Q. I have been told I need a magnetic pre-filter installed onto the primary heating return why?

A. In most cases, if your boiler is older than 10 years or was not installed correctly you need to have a primary magnetic filter installed like Adey Magnaclean ™ for example. Please note there are many other primary filters you can also buy and install that are just as effective.  This will apart from chemicals help you protect your heating system going forward after a power flush.  If you have a newer boiler and an installer has failed to install a primary filter in accordance with Benchmark, BS7593:2019 and manufactures instructions this may invalidate your manufacturer’s warranty. 

Please also note in hard water areas over 250ppm you are also required to have an electrolytic In-Line Scale Inhibitor.


Q. I had my system power flushed and it did not work.

A. Either the system was not power flushed correctly. You have another issue within your central heating system or you require powder flushing.

Q. I have been told I need to have two visits by a heating engineer to deal with my heating system. Is this right and why is a heating engineer unable to deal with my problem in one go?

A. If your system is completely blocked or nearly there to the point your boiler keeps shutting down.  It would be highly beneficial to carry out a chemical pre-dose with Kamco hyper flush or equivalent at least one week prior to the main power flush. This in most cases will get things moving and allow the power flush machine to complete a better system flush and clean.

Q. A power flush is guaranteed to sort my heating and boiler problems out?

A. There is not much in life that’s guaranteed apart from death and taxes that we can think of.  Therefore the answer is no. We nor should anyone else put you under any expectation.  A power flush has its limitations and is not the magic pill for every boiler related issue or central heating and hot water problem or fault.


“I have heard that power flushing will actually cause leaks in a heating system”.


This is unlikely because many power flush systems, such as the ones we use are Clearflow pumps manufactured by Kamco ™. They are designed so that the maximum pressure is two bars or less. It is a high flow rate that makes power flushing effective, not high pressure.


However, do note! On systems that are so badly corroded. Power flushing will remove all if not most of the corrosion. Radiators and other pipework that have become extremely thin due to corrosion could technically start to leak whilst power flushing. It is important to understand in this instance, Heating pipework or radiator(s) would have leaked sooner or later regardless of power flushing if they were too corroded.


“I have heard that the pressure from a power flushing pump will damage my boiler”.


This one is definitely another old wives tale! For safety reasons, the internals (water group) of a boiler has been tested by the manufacturer to withstand 4.5 bar. The maximum pressure of a power flushing pump will never exceed much more than 2 bar at the closet point to the machine, therefore power flushing will not over-pressurise and damage any internals of a boiler.


“You can’t fire a combination boiler to heat up the water during a power flush”.


You should fire the boiler during a power flush if it is working and able to do so. Power flushing chemicals and power flushing work far better when heated than when cold. A combi boiler needs to be at least 0.5 bar water pressure before it will fire, and non-firing is usually related to an apparent lack of pressure.


“You dont need to ever power flush. It is enough to just fit a magnetic filter to the heating system on the return to the boiler”.


Whilst installing a permanent filter is a great idea, it can only remove debris from the water passing through it, invariably leaving debris elsewhere in the system to break loose at a later date. Most permanent filters have a limited capacity and the debris in many systems would overwhelm their capacity. Relying on the standard circulator pump to remove corrosion debris is a triumph of hope over experience as it can never be as effective as the much higher flow rate of a power flushing pump as stated above with Magnacleanse ™.


Image of a pressure gauge on a plumbing and heating pipe.


How much does power flushing costs plus how to book a heating engineer


Our full system power flush cost starts at £400.00 including a boiler if applicable. You will receive a full system power flush for up to six radiators. Price includes all required chemicals as well as a completed certificate of power flushing in accordance with BS7593:2019.


Please see a further cost breakdown table below for bigger heating systems. To make an enquiry or to book a heating engineer click here.


10% Off First Time Visits

For residents and business who live and work within North London or East London


Your No 1 Plumbing Specialist

Consistently rated five stars by our clients for our communication and level services we provide.

Free Instant Estimates

We do our best to provide clients with the closest estimates as possible based on thousands of previous jobs on a like for like basis. *Some request may require a home visit, there may be a charge for this.

Since 2004

Fully Licensed & Insured

Glow Worm boiler logo
Honeywell Heating Controls logo
Vaillant Boilers logo
Platinum Emergency Services Ltd Gas Safe License
Worcester Boilers
Selection of Heating Controls Company Logos
Baxi Boilers Logo
Biasi Boilers

Urgent Assistance

Schedule An Appointment
Or Get an Instant Estimate

Visit Us

Platinum Emergency Services Ltd 6 Salop Road, Walthamstow, London E17 7HT

Email us

Get An Estimate

Request An Engineer

Our Top Trades

Follow Us

Platinum Emergency Services Ltd

6 Salop Road



E17 7HT