Sounds painful, right?

But it’s actually not that hard. Anyone can do it with the right tools- regardless of your level of DIY knowledge. And we’re ready to help you do it on your own.

Why should I bleed my radiators?

Ever felt that your radiator is not doing what it should be?

That it’s warm in some spots and cold in others?

That the room is taking too long to heat up?

That you have to turn the heating up to bank busting levels to warm up the room?

That your radiator is making too much noise for comfort?

All these are signs that there is too much air trapped in the system. When that happens, the hot water from the boiler is unable to circulate around the system. Bleeding will release that air so that the hot water can keep going around the system freely again.

how to bleed a radiator
  • Radiator key for unlocking the radiator (see the left image)
  • cup or cloth to catch water
  • Safety Gloves to protect your hands from getting scolded by the radiators’ hot water

Anything else I need to know before starting?

Again, there will likely be some hot water involved, so be very careful.

So, how do I do this?

Checking the radiators:

  1. Turn the heating on and wait for all the radiators to heat up. If you have a lot of radiators at home, that could take time, so you’ll need to be patient.
  2. Put on your safety gloves and feel each part of each radiator. If it’s cold at the TOP, it will need bleeding. If it’s also cold at the bottom, it may need to be flushed by a professional.

Bleeding the radiators

  1. Turn off your heating and wait until the radiator has cooled down. If you don’t fancy getting your hands burnt, you want to keep your radiators nice and cool to touch.
  1. Put a cloth or cup beneath the radiator valve

This will catch the water that will drip onto the floor.

(The valve is the small metal piece usually found on the top right)

  1. Put the radiator key into the valve, turn it a quarter of the way anti clockwise, and let the air out. You’ll hear a hissing sound.
  1. Once you stop hearing the hissing and start seeing water, close the valve by turning the key back

Do all of that with each radiator that needs bleeding

  1. Check the boiler pressure. If you notice that it has dropped, you’ll need to top it back up.
  1. Turn the heating on for a final check.

It may take a bit of time to warm up.

If the radiators are still half cold, try bleeding them again.

How often should I do this?

We recommend bleeding your radiators twice a year. Certainly, before the winter kicks in.

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