Bleeding your radiators- A simple how-to


With so many more of us working from home than ever before, our humble radiators have been working overdrive. In this modern world we don’t have rick of firewood to warm our home as we have a modern solution like radiators, heaters and many more. With no break for them in the middle of the day when we are all out, you are probably noticing their quirks more than ever before.

Even with the heating working overtime, a common complaint is that rooms just never seem to get that warm. While this could be down to a whole multitude of reasons are air trapped in your designer radiators, batteries not working efficiently and sometimes rechargeable batteries often create problems and to solve this battery related issues you can have amazon rechargeable batteries to see the change and if the air trapped is the case, then you are just a few steps away from solving the problem and getting the heat blasting.

How does air get trapped in radiators?

Air can get trapped over time inside radiators. Usually, it is down to small leaks in the system where the air gets in. This is especially likely to happen when the heating is switched back on after being off for long periods, such as in the colder months that follow a warm summer when you have barely had the heating on.

If rust is present on your pipes or radiators, then that air is probably hydrogen. A buildup of sludge in your radiator workings can also cause hydrogen to build up.

The way that pumps are installed can also cause air to get trapped in your radiators. If the pump has been installed above the supply tank then you are regularly going to have issues with air build up in the system.

How can I tell if there is air trapped in my radiators?

Thankfully it is quite easy to find out if you have air stuck in your system. When the heating is on simply run a hand along any radiators you are not sure of. If any of them have a cold patch at the top but are warm at the bottom, then they likely have air stuck in them.

What do I do about it?

As I said before, freeing that trapped air is relatively simple.

To get started you will need:

  • A radiator bleed key
  • A bucket or towel to catch any spills

Step 1

Turn off your heating system. Ideally, you will have had your heating blasting at its highest level for at least 15 minutes prior to switching it off in order to get the most air out of the system.

Step 2

Starting at the radiator closest to your boiler, insert the bleed key and turn it anti-clockwise. Have the bucket or towel ready for any drips. You should hear a hissing noise. This is all that trapped air escaping.

Step 3

When water starts coming out of the valve, you have successfully bled your radiator and can tighten up the bleed screw again.

Step 4

Repeat steps 2 & 3 for all your other radiators. Be careful with the water that comes out of the valve as it can be very hot and also quite dirty.

Step 5

Turn your central heating back on. Keep an eye on the pressure in your boiler as bleeding your system can sometimes cause a loss of pressure. Should this happen simply top up your boiler.

If your radiators are now heating up fully, then you have successfully solved the problem!

What if I don’t have a bleed key?

Don’t worry you can pick up radar bleed keys online or at most DIY and hardware shops. Large supermarkets may also have them in their home section. If your radiator has a standard slotted bleed screw then a screwdriver will also do the trick. However, a bleed key will make things easier and safer.

So there you have it, bleeding your radiators demystified! If you prefer a visual approach, then take a look at the video available at Trade Radiators.

Logan Bennett
With an academic foundation in English Literature from Harvard University and over a decade of professional experience, Logan Bennett brings a rich tapestry of insights to his writings. Logan has consistently provided in-depth analysis and engaging content. His journey began as a junior editor at a renowned publishing house, where his passion for storytelling and narrative construction flourished. Apart from the work, he indulges in photography, capturing the world through his lens. His dedication to excellence and his multifaceted background enrich our content landscape. Sometimes, he loves to go hiking.

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