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How To Bleed Your Radiators

Bleeding your radiators is a simple process and only takes a few minutes. Bleeding your radiator is important to eradicate air pockets as they stop hot water circulating around your heating system. This adds strain on your boiler and becomes costly. At Tyne and Wear, we can offer you advice on how to bleed your radiators and get the most out of your heating system.

How to bleed your radiators

How Do I Know If My Radiator Needs Bleeding?

There are a few ways to recognise that your radiators need bleeding, look out for these signs:

  • Takes a while to heat
  • Hearing gurgling noises
  • The Top of the radiator is cold
  • The entire radiator is cold
  • Mildew is on the walls

How Often Should You Bleed A Radiator

Radiators require bleeding at least once a year to remove any air bubbles that form inside. The trapped air stops warm water from circulating around your radiator which can make the radiator have cold spots. It can also occur when routine maintenance happens.

What Tools Do I Need To Bleed A Radiator?

To bleed a radiator all you need is two things: A radiator bleed key or a flathead screwdriver and an old cloth or jug to catch the water. If in doubt, call our engineer at Tyne and Wear and we will give you advice and help you with the process.

Do You Bleed A Radiator Until Water Stops?

On average, it will take no more than 30 seconds for a full bleed. However, this can vary depending on the size of the radiator and the amount of air that is trapped inside. Simply continue bleeding the radiator until the hissing noise has stopped and water starts to escape from the bleed valve.

Bleed Radiator No Water

If there is no water or air that comes out of the radiator when you attempt to bleed it, then the bleed valve could be blocked with paint. Close the inlet and outlet valve at both ends of the radiator then take out the screw from the centre of the bleed valve.

How To Bleed Your Radiators

  1. Switch off your heating. If it is left on, you might experience hot water spraying out of your radiators.
  2. Use the radiator key to turn the valve located on the top side of your radiator. Once attached to the valve, turn anti-clockwise.
  3. You should hear a hissing noise coming from your radiator, this is the trapped air escaping.
  4. Use a cloth or jug to catch any water excess that leaks out
  5. When the hissing noise stops and there is only water escaping, turn the valve clockwise to retighten the valve.
  6. Once you have completed these steps, turn your central heating back on
  7. Check the pressure of your radiators by inspecting the reading from the gauge on your boiler. Pressure will drop when bleeding your radiators but if it has dropped significantly, you will need to refill it. To achieve this, use the lever tap located on your boiler.
  8. Check to make sure your radiator is warm and heating properly.

How To Bleed A Modern Radiator Without A Key

An alternative to a radiator key is using a flat head screwdriver. Most modern radiators will have a small indent which allows for a flat head screwdriver to be inserted into the bleed plug. If your radiator has a slotted bleed crew, a screwdriver will work best as an alternative to a bleed key. Insert the screwdriver into the slot and turn it anti-clockwise to bleed the radiator.

Next Steps

If bleeding your radiators does not fix your heating problems, your radiator probably needs to be drained and flushed. A power flush involves getting rid of any black sludge out of your radiators. Contact our engineers at Tyne and Wear for advice and any queries you may have. We are highly trained and experts in all things boilers. Take a look at our outstanding reviews from our customers