Homeowners — London
Power flush in London
Remove sludge, scale and black iron oxide from your central heating system. Improve radiator output, reduce energy bills and extend boiler life across all London boroughs.
What power flushing removes
What is in a neglected heating system
Black iron oxide sludge
Corrosion product from steel radiators — settles at the bottom of radiators and in the boiler. Restricts flow and causes cold spots.
Limescale
Calcium carbonate deposits from London's hard water. Coats the boiler heat exchanger, causing kettling and reducing efficiency.
Rust and debris
Particles from corroding pipework and fittings. Damages pump bearings and valve seats.
Common questions
Power flush: frequently asked
How much does a power flush cost in London?
A power flush in London typically costs £400–£600 for a typical 3-bedroom house with up to 10 radiators, including inhibitor treatment. Larger systems cost more. We quote per job after assessing the system.
How long does a power flush take?
A power flush on a typical London house takes 6–8 hours. Larger properties with more radiators can take a full day. The system is flushed circuit by circuit until the water runs clear.
Do I need a power flush before a new boiler?
Most boiler manufacturers recommend or require a system flush before installation. Fitting a new boiler on a contaminated system can void the warranty and cause premature failure of the new boiler. Many installers include a power flush or chemical flush in their installation quote.
What are the signs my heating system needs a power flush?
Multiple cold radiators that do not respond to bleeding; dirty grey water when radiators are bled; sluggish heating that takes a long time to warm the house; kettling noise from the boiler; pump failure; and boilers that overheat and lock out.