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How to Bleed a Hot Water System?

Published in Heating System Maintenance 3 mins read

To effectively bleed a hot water system, follow this step-by-step guide:

Preparing to Bleed Your Radiators

Before you begin, gather the necessary tools and prepare your workspace:

  • Container: You'll need a container to catch the water that will be released.
  • Towel: Keep a large towel handy to absorb any spills.
  • Radiator Key or Screwdriver: These are necessary to open the bleed valve on your radiators.

Step-by-Step Bleeding Procedure

The following steps will guide you through bleeding your hot water system, starting with the radiator closest to the boiler:

  1. Locate the Radiator Closest to the Boiler: Begin the process with the radiator that is closest to your boiler, as this is where air is most likely to accumulate.

  2. Close the Radiator Tap: Turn the radiator valve (the one that controls the flow of water into the radiator) to the fully closed position. This stops the flow of hot water.

  3. Position the Container: Place your container directly beneath the bleed valve (usually found at the top of the radiator).

  4. Ready Your Tools: Get your radiator key or screwdriver ready to open the bleed valve.

  5. Open the Bleed Valve: Place your key or screwdriver on the bleed tap and slowly turn it anti-clockwise. You should hear air escaping.

    • Important: Only turn the valve slightly.
    • Listen: Initially, you'll hear air escaping. Once you start to see a consistent flow of water without air bubbles, the radiator is bled.
    • Monitor: Watch the water and be prepared to tighten the bleed valve if water comes out.
  6. Close the Bleed Valve: Once water instead of air comes out, close the bleed valve clockwise. Do not over-tighten.

  7. Repeat for Other Radiators: Continue this procedure for each radiator in your home, moving from the radiator closest to the boiler to the furthest.

  8. Check System Pressure: After bleeding, the system pressure may drop. You might need to refill the system with water to the recommended pressure indicated in your boiler's manual.

Additional Tips for Effective Bleeding

  • Start with the Closest Radiator: Always start with the radiator closest to the boiler and proceed to the furthest.
  • Be Patient: Sometimes it takes a little while to get all the air out.
  • Check Pressure Regularly: Monitor the pressure gauge on your boiler and top up as required.
  • Professional Help: If you have any issues or are not confident in completing these tasks, call a qualified plumber.

By following these steps, you can effectively bleed your hot water system, ensuring it runs efficiently.