Typical timing
For an average home, a power flush usually takes most of a day — often around six to eight hours. A small flat may be quicker; a large house with many radiators or heavy sludge can run longer.
What happens on the day
The engineer connects the flushing unit, cleans through the system radiator by radiator, flushes out the dirty water until it runs clear, adds an inhibitor and refills. Expect some noise and a bit of furniture-moving near radiators.
Will I have heating that evening?
In most cases, yes — the system is refilled and running before we leave. Only unusually large or problematic systems spill into a second visit, and we’ll tell you in advance if that’s likely.
How to prepare
Clear access to all radiators and the boiler, move anything valuable away from them, and let us know of any known leaks or awkward valves beforehand — it helps the day run smoothly.
Want a power flush done in a day, with heating back on the same evening? We’ll give you a realistic time for your system up front. South Manchester and Cheshire.
See our power flushing service
