A radiator that stays cold at the top may have air trapped inside it. Bleeding can sometimes restore even heating, but it is worth checking the symptoms first rather than opening every radiator as a matter of routine.
Bleeding releases gas trapped inside a radiator so that hot water can circulate through it properly. A cool patch at the top or gurgling noises may suggest trapped air. A radiator that is cold at the bottom can have a different problem, such as a build-up of deposits, so bleeding is not always the answer.
Check when the heating is running: is the radiator warm at the bottom but noticeably cool at the top? Has it started gurgling? Those are useful clues. There is no need to bleed every radiator on a fixed schedule when it is heating evenly.
If radiators repeatedly collect gas, the boiler pressure continues to fall, or a radiator stays cold despite bleeding, the system may need a closer look. Repeatedly bleeding or topping up pressure is not a substitute for finding a leak or corrosion-related problem.
Need help with uneven heating or a radiator that is not improving? Our heating team can arrange an appropriate inspection and explain the next steps.
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