cold spots in radiators

If you are noticing cold spots in your radiator it could be due to a number of different things. However, you don’t always have to call a plumber for small things such as this. We will teach you how to spot what the cause of the cold spots are. Here is some advice on how to diagnose the problem and then fix it.


The location of the cold spot can actually give you some insight as to what the cause of the cold spot might be. You don’t need fancy tools or skills to detect cold spots within your radiator which makes diagnosing the problem easy to do.


If the cold spots are at the top of the radiator then it is possible that it could be trapped air within the heating system. The best way to solve this problem is by bleeding the radiator. You don’t need a plumber for this and in fact can find detailed, step by step instructions on how to do it online.


Cold spots in the centre of the radiator can be caused from a build-up of rust and sludge which then blocks the bottom side of the radiator. You can sort this issue power flushing your heating system. You are best calling a professional to do this as they have the right equipment and knowledge to deal with this. To prevent sludge building up in your system you can buy a filter from Boiler-m8.


Just like if the cold spot is at the centre, this could also be from a build of debris and sludge. However, you might not have to power flush your whole system. If you have an open-vent system then you can buy a heating system sludge remover which are available in many stores. You can then flush your system yourself by adding the liquid to the feed and expansion tank. After a few days, you should empty and refill the system.

If you have tried all of the solutions above and still find that your radiator has cold spots then maybe it’s time for a new radiator. We have a huge variety of radiators from traditional to contemporary designs so you can replace your old radiator with a new one that you will be proud of. Check out our full range here

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