Experts are warning households a common boiler mistake could leave them thousands of pounds out of pocket.
Putting off regular maintenance of boilers can lead to a breakdown and costly repairs further down the line.
Experts say 75% of condemned boilers could have been "saved" with basic maintenance.
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Boilers are generally supposed to be serviced every year to make sure they are still in good working order, but it's something which is commonly forgotten about or put off.
A boiler replacement can cost between £3,000 and £6,000, and leave households in financial crisis if it happens during winter.
Ben Price, heating expert at Hea