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Four warning signs that your boiler could be about to kill you - Mirror Online
Why a carbon monoxide monitor in your home may not be enough to protect you - The Washington Post
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Central heating boiler could KILL in your sleep if you see these signs | Express.co.uk
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Black soot marks or stains on the wall around a gas boiler, indicator of a combustion problem or possible carbon monoxide gas leak Stock Photo - Alamy
