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Bleed Radiators: Easy DIY Guide to Restore Efficient Heating
17 June 2026
By Enflame Heating and Plumbing
Keeping your radiators free of trapped air
Keeping your radiators free of trapped air is essential for ensuring they heat up properly throughout. Here’s a simple guide to bleeding your radiators yourself:
What You'll Need:
- Radiator bleed key (available at most hardware stores)
- Rag or towel
Steps:
- Locate the Bleed Valve: Find the bleed valve on your radiator. It's usually a small square or circular valve at the top of the radiator, opposite the end where the pipe enters.
- Place the Rag Underneath: Put the rag or towel under the bleed valve to catch any drips of water.
- Insert and Turn the Key: Use the radiator bleed key and insert it into the bleed valve. Turn the key anti-clockwise slowly.
- Release the Air: As you turn the key, you'll hear air hissing out of the valve. This is the trapped air you're releasing.
- Wait for Water: Keep the key turned until water starts to come out, along with a possible sputtering sound. Tighten the key as soon as you see steady water flow.
- Close the Valve and Repeat: Turn the key clockwise to close the bleed valve securely. Repeat this process on all your radiators in the house.
Bleeding Tips:
- It's best to bleed your radiators once a year, ideally before winter.
- If you're unsure about any steps, consult a qualified heating engineer for assistance.
- Only open the valve slightly – a small turn is enough to release the air.
By following these simple steps, you can bleed your radiators yourself and ensure a warm and comfortable home throughout the winter.
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