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A Quick Guide on How to Bleed a Radiator

Discovering a radiator leaking water can be a cause for concern, especially during the colder seasons when a functioning heating system is indispensable. One common and manageable issue associated with this problem is trapped air within the radiator. This can lead to diminished heating efficiency and, in some cases, leaks. In this article, we will walk you through the process of bleeding a radiator, offering a quick and effective solution. Additionally, we’ll introduce Ecofix Boiler, a reliable service for emergency boiler repair in London.

Understanding the Issue:

A radiator leaking water often indicates a buildup of air within the system. Over time, air pockets can form, hindering the proper circulation of water and causing issues such as gurgling sounds or reduced heating performance. Bleeding a radiator is a straightforward task that helps release trapped air, restoring the radiator’s functionality and preventing further leaks.

Materials Needed:

  1. Towels or rags
  2. Radiator key or flat-blade screwdriver
  3. Container (if necessary, for collecting water)

Step-by-Step Guide:

  1. Turn Off the Heating System: Begin by turning off your heating system. This prevents hot water from spraying out during the bleeding process.
  2. Locate the Bleed Valve: Identify the bleed valve, usually situated at the top of the radiator. The bleed valve is a small square nut that can be opened to release trapped air.
  3. Place Towels or Rags: To catch any water that may escape during the process, position towels or rags beneath the radiator.
  4. Use the Radiator Key or Screwdriver: Insert the radiator key into the bleed valve or use a flat-blade screwdriver if your radiator has a screw-type valve. Turn the key or screwdriver counterclockwise to open the valve. You should hear a hissing sound as trapped air escapes.
  5. Wait for Water Flow: Once the hissing stops and water begins to flow steadily, close the bleed valve by turning the key or screwdriver clockwise.
  6. Check the Pressure: After bleeding the radiator, check the boiler’s pressure gauge. If necessary, follow the manufacturer’s instructions to repressurize the system.

Introducing Ecofix Boiler for Emergency Boiler Repair in London:

For persistent issues or if you encounter more complex problems with your boiler, seeking professional assistance is crucial. Ecofix Boiler is a reputable emergency boiler repair service in London, specializing in addressing urgent heating system problems. Their experienced technicians are equipped to handle a range of boiler issues promptly and efficiently, providing peace of mind during unexpected heating emergencies.


Bleeding a radiator is a straightforward and effective solution for a radiator leaking water due to trapped air. Following the step-by-step guide outlined above can help restore your heating system’s efficiency. In situations requiring emergency boiler repair in London, services like Ecofix Boiler offer reliable solutions, ensuring your home remains warm and comfortable during the colder months. Prioritize safety, and when in doubt, consult professionals to address any boiler-related concerns.

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