If your radiators are cold at the bottom, your boiler's making noise, or your bills are creeping up — your system is full of magnetite sludge. We remove it properly, dose the right inhibitor, and fit a magnetic filter so it never builds back up.
Kamco CF90 power flush kit · Sentinel X100 inhibitor included · Adey MagnaClean Pro2 filter included on every flush
Yes
Local to Coventry CV2
Before any work
Written quotes
7 days/week
Open 24/7
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Customer service first
Connecting a high-flow pumping unit (typically Kamco CF90 or Magnaflush) to the heating system, dosing chemical sludge remover (Sentinel X800 or Fernox F3), circulating at high flow rates in reverse and forward directions through each radiator, individually flushing radiators with magnetic agitation, and refilling with fresh inhibitor (Sentinel X100). The system leaves clean water and an installed magnetic filter for ongoing protection.
Homeowners with cold patches on radiators, falling boiler pressure, slow heat-up times, kettling boiler noise, repeated air at the same radiators, or rising gas bills. Anyone installing a new boiler — most major brands require evidence of a system clean for warranty validity. Anyone whose heating engineer has identified high magnetite levels in the system water.
When chemical-only cleaning hasn't worked. When the system is older than 10 years and has never been flushed. When you're replacing a boiler. When the magnetic filter is filling up faster than every 6 months. When a radiator is consistently cold at the bottom (the classic magnetite-fill signature).
Power flushing done badly damages systems — pinhole leaks on tired radiators, dislodged scale tearing pump seals, or chemical residue left in the system that corrodes boilers. Done properly, with the right kit, the right chemicals, and proper isolation, it restores the system to as-new internal condition.
Sludge isn't optional in a closed heating system — it's chemistry. The question is just how much you let build up.
Magnetite restricts flow through the boiler's primary heat exchanger. When restriction triggers overheat lockout, the only fix is heat exchanger replacement — typically £600–£1,200 in parts alone.
Magnetite is abrasive. It grinds pump bearings and valve seats. Pumps last 3–4 years on dirty systems vs 12+ years on clean ones.
Magnetite is the product of internal corrosion. Where you can see magnetite, you have active corrosion eating radiators from the inside. First failure is typically 8–12 years in.
A sludged system makes the boiler work 15–25% harder to deliver the same heat. Hundreds of pounds a year burning gas to push water through restriction.
Test inhibitor level, take a magnetite reading (Sentinel test strip or magnet-and-flask), check pressure history, identify any radiators that look likely to leak (we'll quote their replacement before flushing rather than after).
Kamco CF90 flush kit connected to the system (typically at the pump or via the boiler service valves). Sentinel X800 sludge remover dosed and circulated for 1 hour to mobilise the magnetite.
Each radiator individually isolated and flushed, with the magnetic agitator strapped to the body to lift trapped magnetite into the flow. Both flow and return reversed during the flush — gets sludge that one-direction flushes miss.
Clean water flush until the discharge runs clear. System refilled with fresh inhibitor (Sentinel X100) dosed to manufacturer spec for the system volume.
Adey MagnaClean Pro2 or Spirotech MB3 fitted on the return as standard. System balanced and commissioned. Full written report with before/after photos and system water sample.
Cold spots on radiators disappear. Heat-up times typically halve.
10–20% gas saving is typical for a previously-sludged system in a standard 3-bed home.
Major brands (Worcester, Vaillant, Ideal) require evidence of system cleanliness for warranty — power flush + magnetic filter satisfies that requirement.
Kettling, ticking and banging usually disappear once the magnetite is gone.
Pumps, valves and radiators last dramatically longer on clean water.
Before/after water samples, photos and commissioning report. Useful for resale and for warranty validation.
Not every system needs the same flush. Chemical-only cleans, power flushes, MagnaCleanse boosted flushes — each has its place. The wrong choice is either money wasted or damage caused.
Discuss your projectChemical clean (in-system dose with no kit) — for lightly dirty systems with no symptoms, typically £180–£260. Power flush (Kamco CF90 or similar) — for moderately sludged systems with symptoms, typically £450–£650. Boosted power flush with MagnaCleanse — for heavily sludged systems where time-critical, typically £550–£800.
Sentinel X800 — fast-acting sludge remover for power flushing. Sentinel X400 — slow-acting restorer for less aggressive cleans. Sentinel X100 inhibitor — fresh dose into clean water at end of flush, dosed to system volume. Sentinel X300 noise reducer — for residual kettling on older systems. All chemicals MOB (manufacturer-of-boiler) approved.
Kamco CF90 power flush unit — main workhorse, 90L/min flow rate, reversible flow direction. Magnetic agitators — strapped to each radiator during individual flush. Adey MagnaCleanse — for boosted flushes on heavily sludged systems. Sentinel test kit — pre-flush diagnosis and post-flush water quality verification.
Adey MagnaClean Pro2 magnetic filter (or equivalent Spirotech) installed on the return. Sentinel X100 inhibitor dosed correctly for system volume. Full radiator balance after flush. Written report with photos and water samples.
Open-vent systems (gravity F&E feed): require careful isolation of the F&E tank before chemical dose to prevent diluting the active. Sealed systems: easier to dose and pressurise, but require attention to expansion vessel charge after flush. Heat-pump systems: lower flow temps mean chemical residence time is longer, so dose strength and timing are adjusted accordingly.
If radiators are already leaking, replace them before flushing — a flush won't fix a leaking radiator, and pressure changes during flush can worsen the leak. If the boiler heat exchanger is already partially blocked, sometimes a swap is more cost-effective than a flush. We'll tell you honestly which side of the line you're on.
Coventry, CV2 & the wider West Midlands.
Call us or request a written quote — we'll come back to you fast.
Local plumber · Coventry CV2 · Open 24/7
