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How to balance your radiators

Spotted something wrong with your radiators? If some radiators in your home are staying cold and others warming up your radiators may be unbalanced. This is fairly common and is nothing to get worried about. Have a go at fixing it yourself with these easy steps...

Why should I balance my radiators? 

When radiators become unbalanced, it means they’re not all heating up together at the same time. To put it simply, the warmest radiators are stealing all the heat from the other radiators in your home. This can be rather annoying as this leaves some rooms in your home colder than others.

But, how does this happen? It’s an issue with your boiler’s water flow and occurs when hot water isn’t evenly distributed throughout your home’s central heating. So if you want a well balanced and comfortable temperature in your home - have a go at fixing the problem yourself and restore it...


1. Bleed your radiators. 

First thing’s first, have a feel around on your radiators for any cold spots. If you notice any, make sure you bleed them. You should bleed the radiators that have any cold spots, then check that they’re now heating up all over the surface of the radiator. 

Find out all the ins and outs of how to bleed a radiator in our helpful guide.

2. Turn off your central heating. 

Now it’s time to completely turn off your heating - allowing time for all the radiators in your home to cool down. Don’t want any sore fingers now, do we?

Depending on what temperature your thermostat is on, It should take anywhere between 30-60 minutes for your radiators to cool down. More than enough time to stick the kettle on.


3. Open your radiator valves. 

Next, open the radiator valves on the radiators you’d like to ‘share the heat’. You’ll find the valve at the side of your radiator. You should open the valve by turning them anti-clockwise (about a quarter turn), until you’re unable to twist them further. You might need to blow the dust off your toolbox as a spanner may be required to do this. 

The same applies to lockshield valves, although you’ll need to remove the plastic cap first before attempting to open the valve. 

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4. Find the warmest radiators. 

The next step is to pop the heating back on and search for the warmest radiators. To find the radiator in question, you need your wits about you. But, usually the likely suspect is the one that’s nearest to where your boiler is located. Make sure you make a note of which radiators are heating up and those that aren’t, (you may need a sidekick to help with your investigation). 


5. Restart your central heating. 

All this means you have to do is switch your heating off and on again. Similar to last time, wait until the radiators have cooled down - then boot it up again. 


6. Turn the lockshield valve on the hottest radiators. 

Head over to the warmest radiators that are absorbing all of the heat from the other radiators. Make sure the valves are tightly locked, then turn them anti-clockwise by a quarter turn to open them. 

7. You’re all done. 

The flow rate should be well and truly balanced now, diverting hot water to the radiators you noticed weren’t working to their full potential. 

If you’re still experiencing issues with your radiators, it might be time to call a professional. They’ll let you know if your problem radiators need to be repaired or replaced. Moreover, it could be a fault with your boiler itself, so calling in a specialist would be useful for you to know for sure. 

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Experience the BOXT way. 


If you’ve gone through our steps and are still having problems, then there may be a blockage in your system. In which case, you’ll need a professional to flush out your system and to take it from there. 

For any boiler-related questions, why not drop us a message on our live chat? It’s dead easy. You’ll get an instant reply from one of our in house experts. From central heating to boiler replacements, they know their stuff and are more than happy to help.

Alternatively, you can speak to one of our BOXT experts directly on, 0800 193 7777. Receive a fixed price quote in 90 seconds and find the perfect solution to any of your heating problems.

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