Radiator Power Flushing For a Clean and Efficient System

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Local trade experts
Gas Safe registered
Fixed price from £441.00 + VAT

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When sludge builds up in your radiators, it can greatly affect how they heat your rooms. Caused by the gradual corrosion of water on the metal parts of your central heating system over many years, this sludge or ‘magnetite’ reduces the amount of heat transferred from your radiators. Magnetite tends to settle within radiators where the flow rate is lower. In turn, your boiler must work longer and harder for a radiator to reach the temperature on your thermostat.

A system power flush clears this sludge away, helping to restore the efficiency of your radiators so you can save on your energy bills.

Customer reviews

Ben completed a powerflush today at my property. He did a fantastic job, well mannered and very respectful. He showed respect for my property, myself and my children.

Hannah, Chiswick, W4
The engineer took time to listen to our concerns and evaluated the job before deciding on the appropriate course of action. We had a power flush of the entire central heating system. The engineer worked methodically all day, cleared up as he went about his business, and explained precisely what needed to be done. We had every confidence in him, and are delighted with the result. The central heating system now works like new.

Mark, Winchmore Hill, N21
Extremely professional and friendly. All jobs done as swiftly, safely and as clean as possible. Had a full boiler replacement, hob replacement and system power flush following water in gas main. All questions answered, advice given and easy to reach if follow up required. Fully recommended.

Nick, Richmond, TW9
Really great company. Their gas engineer was really helpful and friendly. Helped complete a power flush. All done and tidy and great service.

Paul, Eltham, SE9

Does your system need a power flush?

There are three ways to tell if power flushing may be needed:

A thermal imaging camera can check for cool areas on your radiators
By sending a water sample for testing, resulting in a yes / no answer
You may be able to feel for cold spots with the back of your hand

Radiators may have cold spots or heat up slowly for other reasons too, so feeling with your hand is the least reliable method of telling if a system power flush would be beneficial. You’ll only know for sure by arranging a visit from an engineer.

We can check for temperature issues within your radiators (the cold areas are shown as dark spots on a thermal imaging camera) and collect a water sample for testing so we can make a clear recommendation. With these methods, you can trust our engineers to perform a power flush only when necessary.

Our gas engineer rates

Set prices from £441.00
Up to four radiators
Extra radiators from £58.50
Prices are excluding VAT

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Aspect's customer support team is available 24 hours a day, 365 days a year

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No hidden extras

What you get from Aspect

Experienced & vetted tradespeople
24 hour availability for all trades
Dedicated technical support team
Aspect Guarantee on workmanship
Peace of mind from trade accreditation

Occasional extra costs

Parts and materials used
Collection of parts and materials

We won’t charge you for

Cost of parking
Fuel or travel time
Congestion Charge
ULEZ charge

How does power flushing work?

A power flushing machine pumps clean water and a special cleaning solution through your central heating system to remove the dirt, scale and sludge inside. To start, we connect the machine to the pipework, flush for at least 2 hours and then remove the dirty water.

We then flush each radiator individually for around 30 minutes, before flushing the whole system at once until it’s clean – removing the magnetite that’s known for blocking radiator heat transfer. We’ll then vent and test the system. The process usually takes a full day, depending on the size and type of heating system you own.

Your engineer completes the system power flush by adding the correct amount of inhibitor that helps reduce corrosion in the future. We can also perform a chemical flush at a later date (done by simply running the boiler to let the chemicals circulate), which is a good way to keep your system clean a year or more after power flushing.

Want to learn more about power flushing? We’ll give you a call. Request a callback

Our guarantee and accreditations

We’re fully trade accredited to power flush radiators and work on any part of your heating system. Aspect is registered with Gas Safe and a member of the Building Engineering Services Association (BESA). We also provide a 12-month guarantee for all workmanship that our engineers provide.

When you book a system power flush from a member of our team, you can count on getting a professional service and the friendly advice you need.

Account customers

We have a dedicated team of account handlers to support multi-site customers and commercial properties across London and the nearby areas. These include: Restaurants, Bars, Offices, Retail, Landlords, Letting Agencies, Hotels, Schools, Embassies, Care Homes and more.

More about our account services

Areas we cover

Aspect trade services across the South East and the East of England

We provide central heating system power flushes throughout Greater London and the Home Counties. Our service area includes Berkshire, Buckinghamshire, Essex, Hertfordshire, Kent, and Surrey. Use our postcode checker to see instantly if we cover your area.

If you need a power flush outside of this coverage area, we may still be able to help. Our team will check availability and see if one can be scheduled for your location.

Call or submit a callback request, and a member of our team will be in touch with you.

Submit your request

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Our other heating & hot water services

You can book our Gas Safe registered engineers for a variety of jobs. Read more about the range of services we provide here: –

Landlord gas safety certificates; with an annual certificate (CP12), you show that you’ve done your part to keep your rented accommodation safe
The annual boiler service; yearly servicing maximises the lifespan of combi boilers and it’s the only way to keep their manufacturer warranties valid
Same-day boiler repair; if you have low or high pressure, or any other problem, we can send someone within the hour to start fixing your boiler
Gas boiler installations; when you’re buying a property, it makes financial sense to get your heating assessed well in advance
A central heating system report; when you’re buying a property it makes financial sense to have the central heating system assessed in advance