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How much will your central heating system benefit from a power flush? Having cold radiators, poor circulation, sludge build-up and blockages can lead to inefficiencies, higher energy costs and even leaks in the case of rusting radiators.

Our experts can assess the extent to which your radiators are impacted by the build-up of magnetite. Thermal imaging cameras show how efficiently radiator panels are able to heat a room. The same technology is also used to show how effective the power flush has been at removing magnetite from the system.

Water testing a central heating system for advice on cleaning or flushing

Do you need a power flush?

Simple checks on your radiators can help identify whether you might need a power flush:

  • Turn your central heating system on
  • Leave it on until the radiators are warm
  • Briefly hold your hand against the front panel
  • Compare temperatures of the two top corners with the bottom centre
  • If the bottom centre is cooler than other parts you could benefit from a power flush

Alternatively, our tradesperson can carry out a water test to confirm whether or not a central heating system should be cleaned. Within a few minutes, a definitive result is obtained.

Recent customer reviews

  • 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

  • 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

  • Renovating a flat in London is daunting. Contractors tend not to show up on the day of a booked appointment and many are performing their jobs below the expected quality bar. Boiler replacement I booked with Archie through Aspect was nothing like that. He was punctual, worked efficiently and he was ready to answer all my questions. After the work was done, he ran some tests of the whole heating system and cleaned the site. Thank you for our new boiler and your professional approach.

    Meta, St John's Wood, NW8

  • 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

  • This company are excellent. An appointment to service my boiler was made within 48 hours. The engineer who attended was extremely thorough and very professional. He checked every part of the boiler and gas supply meticulously.

    David, Fulham, SW6

Trustpilot

What to expect from a power flush

Water in a central heating system corrodes steel or iron radiators. Without the correct dose of system protector, ferrous oxide (rust) will form. This creates a dark sludge in the system, which is called “magnetite”.

The sludge typically settles at the centre of a radiator where water flow velocity is lower. As the sludge settles and solidifies, it prevents the hot water from heating that part of the radiator panel. Power flushing removes magnetite and can restore the performance of the system.

A power flush takes at least 4-hours depending on the size of the system and the amount of magnetite present.

Cleaning chemicals are pumped at an increased pressure through the system. At the right temperature they break down the solidified sludge. The power flush machine removes magnetite particles that are suspended in the chemical solution.

Once the sludge has been removed, the system is topped up with clean water and the correct dose of inhibitor is added.

Pricing

We like to make things easy! Power flushes are usually charged at a fixed price. The minimum price allows for four radiators. The price increases with each additional radiator:

Weekdays between 7am and 5pm

  • Up to four radiators = From £441.00 + VAT
  • Each additional radiator = From £58.50 + VAT

NB: Higher rates apply for power flushes scheduled for evenings and weekends.

If you’re unsure whether or not you need a power flush, a gas engineer can be booked to provide an assessment and recommendations. A half-hour rate is charged (1-hour minimum):

  • Domestic gas supply = From £49.50 + VAT
  • Non-domestic gas supply = From £63.00 + VAT
London Property Maintenance

Why choose Aspect?

  • Large team of expert gas engineers
  • Clear pricing; no hidden extras
  • 12-month workmanship guarantee
  • Quick response across London
  • Emergency response 24/7
  • Knowledge & advice you can trust
  • 5-star customer service