Radiator installation and power flushing in London
Radiators cold at the bottom, a system that heats some rooms and not others, black water when you bleed it. That is sludge — corrosion debris circulating through the system and settling where the flow is slowest. A power flush shifts it. Fitting a new radiator, or moving one for a decorator, is the other half of this page.
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What this includes
- Power flushing a sludged central heating system
- Chemical cleanse and fresh inhibitor
- Magnetic system filter fitted at the same time
- New radiators fitted, and old ones swapped like for like
- Radiators moved, removed for decorating and refitted
- Balancing a system that heats unevenly
Worth knowing first
Some of this may save you a callout entirely. We would rather tell you than not.
Cold at the bottom means sludge
Cold at the top means air and bleeding fixes it. Cold at the bottom while the top is hot means debris sitting in the bottom of the radiator, and bleeding will do absolutely nothing. That is the one that needs flushing.
A power flush is not always the answer
If one radiator is cold and the rest are fine, the problem is usually that radiator or its valve, not the whole system. Flushing an entire house to fix one radiator is an expensive way to do it, and we will say so.
A filter is worth more than a second flush
A magnetic filter on the return catches the debris that forms after the flush, and emptying it once a year keeps the system clean. Without one, a flushed system starts filling up again immediately.
Be careful flushing an old system with a tired boiler
A hard flush through pipework and a heat exchanger already near the end of their life can turn a slow problem into an immediate one. If that is where you are, we will tell you before we start rather than after.
Common questions
How do I know if I need a power flush?
Radiators cold at the bottom, rooms that never get warm, black water when bleeding, or a boiler that keeps cutting out on overheat. One of those on its own may be something else; three of them together is usually sludge.
How long does a power flush take?
Most houses are a day. It depends on the number of radiators and how bad the system is, and we would rather do it properly in a day than badly in three hours.
Will it fix a cold radiator?
If the cause is debris, yes. If the cause is a seized valve, an airlock or a system that has never been balanced, a flush will not touch it — which is why we check first.
Do you fit designer and column radiators?
Yes. Heavy cast-iron and tall column radiators need the wall and the fixings checked properly, and sometimes the pipework moved, so those are quoted after a look rather than over the phone.
Part of our heating & hot water work
If the job turns out to be a repair rather than an installation, these are the pages that cover it.
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Boiler Service
The annual check that keeps a boiler safe, efficient and inside its warranty terms.
More on Boiler Service -
General Plumbing
Taps, toilets, radiators and pipework. The jobs that never quite get done.
More on General Plumbing
Other appliance work
Related advice
Need radiators & power flushing in London?
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