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How To Bleed a Radiator

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An uneven distribution of heat in your central heating system is both inefficient and annoying. Yet it can be resolved with a minimum of effort by simply 'bleeding' your radiator.
What you'll need: 
Cloth
Radiator key
1: 
The most tell-tale sign that your radiator requires bleeding is an uneven spread of heat. This will manifest in a radiator that is cooler at the top than at the bottom.
2: 
Having determined that your radiator(s) are in need of bleeding, you should acquire a radiator or bleed key. These keys are inexpensive and can be bought at most hardware stores. It is best to buy a couple to keep around the house.
3: 
Turn off your central heating before starting work. By opening the radiator with the bleed key you will be allowing trapped air to escape. You should therefore cover the hole with the cloth in case hot air or water escapes from the radiator.
4: 
Once the air has escaped from the radiator and water begins to bubble out, use the bleed key to seal the radiator. The central heating can then be turned back on.
Warnings: 
If your radiator requires bleeding on a fairly frequent basis it should be serviced by a professional as there is likely to be a leak in the system.

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