Gas Boiler Safety

How Safe Is Your Gas Boiler? 7 Warning Signs Every Homeowner Should Know

Gas boilers are essential to daily comfort — but how safe is your gas boiler really? Gas boiler safety is something every homeowner should take seriously, especially when small issues can turn into major risks.

In this guide, the team at Plumble shares seven key warning signs your boiler might be unsafe — and what to do about it.

1. A Yellow or Flickering Flame

Your boiler should always burn with a crisp blue flame. If it turns yellow or flickers, it could be a sign of incomplete combustion — and a risk of carbon monoxide production. This is a serious gas boiler safety concern that needs urgent attention.

2. Strange Smells Near the Boiler

Gas itself is odourless, but providers add a distinctive smell to alert you to leaks. If you notice a sulphur or rotten egg odour near your boiler, turn it off, ventilate the area, and contact a Gas Safe engineer immediately.

3. Pilot Light Going Out Regularly

Older boilers with pilot lights should remain steady. If yours keeps going out, it may be a faulty component — or a symptom of poor ventilation. Either way, this issue shouldn’t be ignored if you’re concerned about gas boiler safety.

4. Soot, Staining or Black Marks Around the Boiler

Dark marks or soot around the boiler casing or flue can indicate poor combustion and a potential carbon monoxide leak. These are visual clues that your gas boiler may be operating unsafely.

5. Drips and Leaks

Leaks can cause internal damage and, over time, affect safety mechanisms. If your boiler is dripping, it’s more than a nuisance — it could lead to pressure loss or corrosion inside the unit.

6. Physical Symptoms in the Home

Carbon monoxide poisoning symptoms include headaches, dizziness, nausea, and confusion. If multiple people experience these at home — especially when the heating is on — leave the house immediately and seek help. Then book a gas boiler safety check.

7. Lack of Annual Servicing

Routine checks are crucial for safe boiler performance. Annual servicing by a Gas Safe engineer will identify early faults, test emissions, and ensure the system runs efficiently. If it’s been over a year — it’s time to book in.

Protect Your Home with a Gas Boiler Safety Inspection

Plumble’s Gas Safe engineers carry out expert servicing and safety inspections across Kent. Whether your boiler shows warning signs or simply needs its yearly service, we’re here to help you heat your home confidently and safely.

→ Book your boiler safety inspection with Plumble