Power flush cost
Cold radiators at the bottom, dark water when you bleed, noisy pipes or poor heat upstairs often point at sludge rather than a broken boiler. A power flush clears the circuit. It is not cheap, and it is not always the right answer.
What a power flush involves
A power flush circulates cleaner through the heating system at high flow to lift magnetite and debris from radiators and pipework. Afterwards the system is refilled, inhibited to BS 7593 and, where fitted, the magnetic filter is cleaned.
On a new boiler installation a clean system helps protect the heat exchanger and can support manufacturer warranty conditions. We say so when the old circuit is heavily fouled rather than discovering it mid-job.
What drives the price
System size, radiator count, how heavily the water is fouled and how accessible the pipework is. A small modern system with a filter already fitted is a different job from an old microbore circuit that has never been inhibited.
We assess on site and quote before we start. If balancing or a failed pump is the real fault, we will say a flush will not fix it.
Cold at the top vs cold at the bottom
Cold at the top and warm at the bottom is usually air and needs bleeding. Cold at the bottom and warm at the top is classic sludge. Whole radiators that stay cool while others are hot often means the system has never been balanced at the lockshield valves. We check in that order.
Related services
FAQs
Common signs are cold spots at the bottom of radiators, dark water when bleeding, noisy pipes or poor heat upstairs. We assess on site rather than selling a flush over the phone.
Often yes when the old system is dirty. A clean circuit protects the new boiler. We advise after looking at the water and the filter.
No. Balancing, a tired pump or a blocked valve can look similar. That is why we diagnose before quoting a flush.
Yes. Power flushing across Rotherham, Sheffield, Doncaster and Barnsley.