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Power Flushing in Birmingham

A power flush costs £550 for a system of up to 10 radiators. It clears magnetite sludge and scale from radiators, pipework and the boiler heat exchanger using a pumped flushing machine and chemicals.

Quick answer

A power flush costs £550 for a system of up to 10 radiators. It clears magnetite sludge and scale from radiators, pipework and the boiler heat exchanger using a pumped flushing machine and chemicals. You need one if radiators are cold at the bottom, the boiler is noisy or kettling, or you are fitting a new boiler onto old pipework.

Power Flushing in Birmingham — Synergy Gas & Plumbing, Birmingham
Power flushing across Birmingham and the Black Country. Gas Safe registered 594385.

Do you actually need one?

Power flushing is oversold in this trade. Here are the honest signs that you do need one:

  • Radiators hot at the top, cold at the bottom, across more than one room
  • Black water when you bleed a radiator
  • Some radiators never heat up while others are fine
  • Banging, kettling or gurgling from the boiler
  • Repeated pump failures or a boiler locking out on overheat
  • You are fitting a new boiler onto pipework more than ten years old

And when you probably do not: one cold radiator (that is usually balancing or a stuck TRV pin), a radiator cold at the top (that is air — bleed it), or a system that a chemical clean and a new magnetic filter would sort for a third of the price. We will tell you which camp you are in.

What the process involves

A flushing machine is connected to the system and pushes water through at high volume but low pressure, reversing direction to shift debris that a normal circulation would never dislodge. Cleaning chemicals and a sludge remover go in, each radiator is isolated and worked individually, agitation is applied to stubborn ones, and the system is dumped and refilled until the water runs clear. Finally the system is dosed with corrosion inhibitor.

Allow most of a day for an average three-bed house. The system will be off during that time.

Fit a magnetic filter afterwards

A power flush cleans what is already there; a magnetic filter stops it coming back. We supply and fit one for £320, and it is the single best £320 you can spend on a heating system. Every new boiler we install includes one as standard.

Boiler warranties

Manufacturers require the system to be cleaned to BS 7593 standards when a new boiler goes in. If your old system is heavily contaminated and we install without cleaning it, your warranty claim can be refused later. This is why we sometimes insist on a flush before an installation — not as an upsell, but because the alternative is you carrying the risk.

Rather we rang you?

Leave a number and a postcode. We will call you back — usually within the hour during office hours.

Prices

Fixed prices, updated August 2026
JobPrice
Power flush, up to 10 radiators£550
Supply and fit magnetic filter£320
Chemical clean and inhibitor doseQuoted on site
Systems over 10 radiatorsQuoted on site

Prices are estimates and may change after a site inspection. We cover Birmingham and 10 miles from B20 2JS as standard, extending to 50 miles for boiler installations. A travel charge may apply beyond 10 miles.

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Power flushing

£550 up to 10 radiators
CalloutSame day where possible
OfficeMon–Fri 8–5.30
Emergency24/7
Gas Safe reg.594385

Coverage

From B20 2JS
Standard radius10 miles
Installationsup to 50 miles
TownsB'ham, Sandwell, Walsall, Dudley, Solihull
Answers

Power flushing: common questions

How much does a power flush cost in Birmingham?

£550 for a system of up to 10 radiators. Larger systems are quoted individually. A magnetic filter, which we strongly recommend fitting at the same time, is £320.

How long does a power flush take?

Most of a working day for a typical three-bedroom house. Badly contaminated systems can take longer.

Will a power flush fix one cold radiator?

Usually not. A single cold radiator is more often a stuck thermostatic valve pin or a balancing issue, both far cheaper to fix. We check that first.

How often is a power flush needed?

A well-inhibited system with a magnetic filter should not need flushing again for many years. Systems with no inhibitor and no filter tend to need attention every 5–8 years.

Can a power flush damage old pipework?

On very old systems with corroded steel pipe, flushing can occasionally reveal an existing weak point. We assess the system's condition first and will tell you if a gentler chemical clean is the safer option.

Also

Other services

Boiler playing up? We can usually get to you the same day.

Call the Birmingham office for a straight answer and a fixed price before we start work.

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