Central heating power flushing
Three questions people actually want answered: what does it cost, what happens on the day, and will it fix my problem. One page each, no padding.
What it costs
£350–£800 by radiator count for 2026, why London runs higher, and every cheaper alternative listed above the expensive one.
How it's done
Step by step, including the radiator-by-radiator stage that takes the time and is the part most often skipped.
What it achieves
What genuinely improves on a sludged system, and an honest list of the seven things a flush will not fix.
Start before all three
If you haven't already worked out whether you need one, do that first — it's the question that saves people the most money. The diagnostic checklist takes about a minute, and a good share of people stop at the second question.
If you know you've got sludge but aren't sure how bad, power flush vs chemical flush covers which job is proportionate.
Get an honest answer on what your system needs
Tell us the symptoms. We'll pass it to a Gas Safe engineer covering your area who can tell you whether you need a flush — including if the answer is no.