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Which radiators do you bleed first?

In properties with two or more floors, you should bleed downstairs radiators first. Begin with the radiator situated furthest away from your boiler or central heating system. (Also start with this radiator in single-storey homes or bungalows). You…
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What happens if you bleed a radiator with the heating on?

You should never bleed a radiator with the heating switched on. You would run the risk of scalding or burning yourself just from touching the radiator or radiators, whilst hazardous hot water could also spurt out. Read our Advice…
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What is a bleed valve?

A bleed valve is the small metal square or screw located within the surrounding nut, usually found at the top of the radiator corner, either on the left or right hand side. It can be opened to release trapped air from within your radiators…
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Why are my radiators hot at the top but cold at the bottom?

Radiators can be hot at the top but cold at the bottom when something is preventing the flow of water throughout them. In most cases when the radiator is cold at the bottom, you will find a build-up of sludge towards the foot of the…
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What key do I need to bleed a radiator?

A specialist radiator bleed key is recommended for bleeding radiators. You can usually find bleed keys at your local DIY or hardware store. If you are unable to source a bleed key or have misplaced the one you own, a flat-blade screwdriver…
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How do you bleed a radiator without a key?

It depends what type of bleed screw is fitted to your radiator. For radiators with a slotted bleed screw, a simple screwdriver represents an ideal alternative to a bleed key. Just insert the screwdriver into the slot and turn it in a…
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How do I prevent cold spots on my radiator?

You can bleed your radiators to eradicate the problem of cold spots. Follow the advice specified in our guide on how to bleed a radiator.
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Why are some of my radiators hotter than others?

There could be several reasons why some radiators are hotter than others in the home. It might simply be the case that certain radiators have higher heat outputs than others. Or, if you know the radiators to have identical heat outputs…
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Why do all my radiators heat up except one?

It is likely that the radiator that isn’t heating up properly has trapped air inside it, leading to cold spots. You can bleed the radiator to release trapped air, following the steps listed in our guide on how to bleed a radiator.…
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Why do you need to bleed a radiator?

Radiators need bleeding to release trapped air, which can prevent hot water from travelling around the radiator. Essentially, you need to bleed a radiator when necessary to ensure your heating is working as efficiently as possible, and…
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Do you bleed radiators when the heating is on or off?

Off. You should never try to bleed radiators with the heating switched on for safety reasons. Potential injury risks attached to the spilling of hot water include burning and scalding. Check out our guide on how to bleed a radiator to…
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Can you bleed a radiator when the heating is on?

You should never bleed a radiator when the heating is switched on, as it could be too hot to touch and result in scalding or burning. There is also the potential for hot water to spurt from the radiator. Detailed tips for safely bleeding…