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Little-known radiator mistake that could cost you up to £300 – how to check

HOUSEHOLDS may not be aware that a common radiator mistake could end up costing them a small fortune.

Radiators need to be bled when they have air trapped inside them. 

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Daniel Khanlarpour of Gas Guru, and a member of Checkatrade

This is because the air stops warm water from circulating around your radiator. 

It's recommended that you bleed your radiators once a year - even if they are working properly.

But one gas engineer has revealed that there's a crucial step you have to take before you do this.

Daniel Khanlarpour of Gas Guru, and a member of Checkatrade, said you should always check your boiler pressure first.

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This is because, if you try and bleed a radiator that doesn’t have any trapped air to release, water will spill from it quickly.

This could lower your boiler's water pressure and upset the whole system, bringing more costs with it.

The average cost of repairing a boiler is £300 on average, with parts included, according to Checkatrade.

If you're already experiencing low pressure, bleeding your radiators could create a bigger problem.

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Daniel said: "Bleeding radiators won’t help the situation if you’re losing pressure, in fact it will make things worse as you’re removing air or water from the system, which will reduce the pressure further.

"Boiler pressure should be checked and corrected after radiators are bled and/or water is drained from the system."

Experts typically say the pressure should be between one and two on the gauge.

Any lower and it might mean the boiler can't fire up properly, which means it's working harder and less efficiently.

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What else to check on your boiler

Combi-boiler vs heat-only

Combi-boilers are considered to be more efficient than a heat-only boiler.

Heat-only boilers are usually found in larger properties, drawing water from a cylinder rather than from the main.

This could mean you will run out of water more frequently.

Old boilers might only reach 60% efficiency, which effectively means that 40% of the money you spend heating your home is unnecessary.

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That compares with a modern combi boiler, which will typically be 90% efficient or more.

Make sure you seek advice from an expert, and take a look at your budget, before you decide to make the switch.

You can also check to see if you could be entitled to a grant to replace your old boiler.

Check if your boiler is on eco-mode

If you have a combi boiler with an eco mode, make sure it's set to this as this will stop your water overheating.

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