Households advised to watch for key boiler warning signs

Over 100,000 boilers break down each year in England, costing an estimated £32 million.

Related topics:  Boilers,  Maintenance,  Heating
Property | Reporter
1st December 2025
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"Though we have already experienced an initial cold snap, the chilliest temperatures are yet to come"
- Helen Rolph - Quotezone

Households are being encouraged to check their boilers before temperatures fall, helping to keep homes running efficiently throughout the colder months.

Figures indicate that more than 100,000 boilers break down each year in England, with repair costs estimated at £32 million. Energy specialists at Quotezone are offering guidance to help families prepare for winter, manage expenses and reduce the risk of unexpected problems.

Common issues, including unexplained condensation or a flickering pilot light, can make properties harder to heat and push bills higher if ignored. The advice follows a survey by Quotezone’s energy team, which found that one in five Britons are concerned about being able to pay their energy bills this winter.

Cold conditions can reduce boiler efficiency at the time residents rely on heating and hot water the most, and inefficient systems can be costly to operate. With concerns rising about day-to-day expenses, the experts are encouraging households to spot early warning signs and get ready for the lower winter temperatures.

“It’s concerning that a fifth of households are worried about warming their homes as we enter the winter months,” said Helen Rolph, energy comparison expert at Quotezone.co.uk. “Though we have already experienced an initial cold snap, the chilliest temperatures are yet to come."

“We are urging all households to carry out simple checks on their boiler, look out for common red flags and get the annual service booked in."

“Poorly maintained boilers can make it much harder for budget-conscious Brits to keep their bills down. Now is the time for the pre-winter boiler MOT."

“Boilers need to be serviced regularly to ensure they are running efficiently and that home insurance is valid. Providers usually specify once a year; failure to look after the boiler could leave homeowners unprotected should they need to make a claim."

“If people own other properties as well, they have a legal obligation as landlords to service the boiler at least once a year, ensuring the safety and comfort of their tenants.”

Quotezone.co.uk highlights several boiler red flags that homeowners should pay attention to:

• Unexpected bill increases. A sudden rise in heating costs without increased usage may indicate that a boiler is no longer running efficiently. Older systems, particularly those over 10 years old, often operate at lower efficiency levels and must work harder to produce heat. Replacing an outdated model can be a long-term solution, although regular servicing can help keep older units functioning.

• Flickering pilot light. A healthy pilot light should burn a steady blue. A yellow or orange flame, or one that flickers or goes out, may point to incomplete combustion. This safety risk requires immediate attention. Checking the light regularly and reviewing guidance for the specific boiler model can help identify problems, and any concerns should be discussed with a professional.

• Leaks. Water pooling under the boiler signals a fault. Ignoring leaks can lead to lower system pressure, weaker heating performance and a shorter boiler lifespan. Even small drips may reflect deteriorating parts. Homeowners who spot damp patches, persistent moisture or unexplained puddles near the boiler should turn the system off and contact an engineer.

• Condensation. New or excessive condensation on nearby windows, walls or vents can indicate that the boiler is not venting moisture properly. Warm, moisture-rich air can then circulate inside the home rather than being released outdoors. Persistent condensation may lead to damp and mould, making early checks essential.

• Turning off by itself. Boilers that shut down unexpectedly may be dealing with low pressure, blockages or trapped air in the radiators. Leaving these issues unresolved can lead to inconsistent heating and higher running costs during the coldest periods, and ongoing faults may create more serious problems over time.

• Blockages. Inactivity over summer can cause blockages that restrict water flow and create cold patches on radiators. A ‘kettling’ noise, similar to boiling, often indicates limited flow. If radiators release dark water when bled, sludge may be building up in the system and needs attention.

• Strange smells and noises. Bad smells can signal a carbon monoxide leak, which must be addressed immediately. Banging or clunking noises can result from limescale in the heat exchanger, and whistling or hissing may point to pressure issues or a partially closed valve. These signs should not be overlooked.

Homeowners are also encouraged to confirm whether their home insurance includes home emergency cover. This typically provides protection for boiler breakdowns and repairs, and the cover can be added or purchased separately if required.

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