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London Manchester
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Planned work · London · from £480 up to 10 rads

Power Flush in London

Sludge is dissolved radiator steel, it settles, insulates and slowly strangles the system.

Get a fixed quote Or call 020 3674 8514
Power flush in London
No call-out feeNo night or weekend surchargeFixed price before we start12-month workmanship guarantee

A power flush strips it out, and the before/after magnet photos show you exactly what was circulating through your boiler.

What you get

Power flush in London: what the price includes

  • 01
    Full-system flush

    Every radiator flushed individually, agitated and reversed until the water runs clear.

  • 02
    Evidence provided

    TDS readings and magnet photos before and after, you see what came out.

  • 03
    Protected afterwards

    Inhibitor dosed and a magnetic filter recommended (or fitted) so the result lasts years, not months.

  • 04
    Boiler-warranty relevant

    New boiler into an old system? Most manufacturers require a cleanse, we do it as part of installation.

  • 05
    Before-and-after readings, not just assurances

    We record system temperatures and take a magnetite reading before and after, and photograph what came out. A power flush is invisible work you cannot inspect, which is precisely why it should be evidenced rather than described.

What this means in London

Local conditions we work around

Hard water is the defining fact for London heating. At 280 to 320 ppm, scale builds on the hottest surface in the system, which is the boiler heat exchanger, and every millimetre of it costs efficiency and shortens the life of the unit. It is why we flush before commissioning a new boiler, why we fit a scale reducer on the mains where the system warrants it, and why an unvented cylinder in London needs its annual service rather more than the manual implies.

Where we do this in London

Covered across London

Same published rate card and the same twelve-month workmanship guarantee everywhere below, there is no postcode loading. Each area has its own page with an arrival time taken from our job records rather than chosen for a website.

GreenwichLewishamCroydonBromleyIlfordRomfordFinchleyBarnetEnfieldWembleyHarrowStratford All London areas →
Straight answers

Power flush in London, your questions

How do I know my system needs one?
Radiators cold at the bottom, brown bleed water, a noisy boiler and a warm pump are the classic four. Two or more and a flush will make a difference you can feel.
What does a power flush cost?
£480 for up to ten radiators, then per-radiator beyond. Larger or heavily sludged systems are quoted honestly after the first readings.
Is it worth it on an old system?
Mostly yes, but a system with existing pinhole leaks can have them unmasked by cleaning. We check radiator condition first and warn you if yours is the rare case where a flush is the wrong money.
How do I know if I need one?
Cold spots at the bottom of radiators, water that runs black when you bleed them, a boiler that kettles, or noisy pipework. If your bleed water is clear and the radiators heat evenly, you do not need one and we will say so.
Is it worth it before a new boiler?
Yes, and most manufacturers require the system to be cleaned for the warranty to stand. Fitting a new boiler onto a dirty system pushes years of accumulated sludge straight through a brand new heat exchanger.
Will it make my old radiators leak?
It can reveal a pinhole that corrosion had already created and sludge was temporarily plugging. That radiator was going to fail regardless. We check the condition of the system first and tell you if that is a realistic risk on yours.
How does London hard water affect heating work?
Considerably. Scale builds on the hottest surface in the system, which is the boiler heat exchanger, and every millimetre costs efficiency and life. It is why we flush before commissioning a new boiler here, why kettling is the most common noise complaint we get in London, and why an unvented cylinder in this city genuinely needs its annual service rather than nominally needing it.
24 hours · 365 days · London

Water where it
shouldn't be? Call.

A person answers, not a menu. You'll have an arrival time and a price range before you hang up.

020 3674 8514

Or WhatsApp 07865 292684, photos help us bring the right parts

Our engineers