What Happens During a Power Flush.

  • Updated 22 October 2026
  • Tips from our experts
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Power flushing your central heating is far less intrusive than most people expect. It’s recommended every five to six years to keep your system in the best possible shape, and most homes are done in a day.

What we need on the day.

Your engineer will need access to all your radiators, the pump and the boiler, and sometimes the loft if your water tank is up there. A professional power flush takes 6 to 12 hours in an average home, and can take longer on systems with microbore piping or in larger and commercial properties.

Power flushing, step by step.

  1. Your engineer surveys your system and attaches the power flushing machine at a single point, usually the pump.
  2. The machine pumps clean water and powerful cleansing chemicals around your system.
  3. The chemicals loosen and dissolve the corrosive sludge, which is drained away safely and cleanly.
  4. Your system is refilled with clean water and topped up with inhibitors, which greatly slow future corrosion.

Flushing the radiators greatly increases their lifespan, and the better circulation lowers your fuel bills, because the boiler and pump have to work less to provide heat and hot water.

Why it’s more convenient than you think.

  • It doesn’t take long. The exact time depends on the size and condition of your system, but in a typical house it’s about a day.
  • There’s very little mess. A power flush creates a small amount of mess at most, and we always clear up afterwards, aiming to leave your home as we found it.
  • Your radiators stay on the wall. None of them need disconnecting.
  • We answer your questions first. Whatever concerns you have about the process, our team is happy to talk them through.
  • Quotes are free. There’s no obligation, and the details we ask for mean the price we give you is accurate.

With a power flush able to take as much as 25% off your heating bills, it’s well worth the day. Build your free estimate, see what power flushing is, or contact our team on 0800 3277 448.

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