Leaking Boiler – Is It Dangerous?

Noticed a puddle under your boiler? If you’ve spotted a leaking boiler in your home, it’s natural to worry. Is it dangerous? Should you turn it off? Do you need a new one?

In this guide, we’ll explain what causes boiler leaks, the risks involved, and when to call in a professional. If you’re based in Kent and need help now, book an urgent boiler repair with Plumble.

Is a Leaking Boiler Dangerous?

The short answer: Yes, it can be. A leaking boiler should never be ignored. While not always immediately hazardous, water near electrical components, or a sign of internal corrosion, can lead to:

• ⚠️ Electrical shorts and risk of fire
• ⚠️ Internal boiler damage and system failure
• ⚠️ Water damage to your property
• ⚠️ Reduced efficiency and heating breakdown

If you see water dripping or pooling beneath your boiler, switch it off and contact a Gas Safe engineer immediately.

Common Causes of a Leaking Boiler

1. Corrosion Inside the Boiler

Over time, internal components like the heat exchanger or pipes can corrode—especially in hard water areas like Kent. This weakens joints and causes leaks.

2. Leaking Pressure Relief Valve (PRV)

If your boiler pressure is too high, the PRV may release excess water. This could be due to overfilling or a fault in the pressure controls.

For more help, read our post on boiler pressure too high.

3. Faulty Pump Seal or Gasket

Pumps circulate hot water through your system. If the seal wears out, water can leak from the bottom of the boiler casing.

4. Cracked Heat Exchanger

This is a serious issue. The heat exchanger is the heart of your boiler, and a crack can lead to major water loss—and even carbon monoxide risk if not fixed.

5. Loose Pipe Connections

Vibration, poor installation, or general wear and tear can cause fittings to work loose, especially near isolation valves or condensate pipes.

What to Do If Your Boiler Is Leaking

• 🔌 Turn off the boiler at the mains to avoid electrical hazards
• 🔒 Shut off the water supply if the leak is steady
• 🧼 Soak up standing water and protect nearby electrical appliances
• 📸 Take photos for insurance or repair reporting
• 📞 Call Plumble’s emergency repair line right away

Do not attempt to open the boiler casing or fix the leak yourself—this could invalidate warranties and put you at risk.

Can a Leaking Boiler Be Repaired?

In most cases—yes. Our engineers can replace seals, gaskets, valves, or pipework as needed. However, if the boiler is over 12 years old or has multiple faults, we may recommend a full replacement.

Learn more about our boiler repair service or explore energy-efficient boiler replacements.

How to Prevent Boiler Leaks

• ✅ Book annual boiler servicing in Kent
• ✅ Install a magnetic system filter to reduce sludge build-up
• ✅ Monitor pressure levels monthly
• ✅ Act fast at the first sign of moisture or drops in pressure

Why Kent Homeowners Trust Plumble

• ✔ Same-day emergency callouts
• ✔ All work carried out by Gas Safe engineers
• ✔ Trusted by homeowners across Medway, Faversham, Ashford and more

“We noticed our boiler leaking on a Sunday. Plumble were out that afternoon and had it fixed within the hour. Fantastic service!” – Daniel, Gillingham

Is Your Boiler Leaking? Don’t Wait

Water and electricity don’t mix. If you have a leaking boiler, get it looked at immediately to protect your home and your safety.

📞 Book a visit online
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☎ Call Plumble: 01732 622990