A boiler leak rarely starts as a dramatic problem — it usually begins as a small drip or damp patch that is easy to miss. Call 020 7183 4810 at the first sign and we will find the source before it causes real damage.
Spotted a leak near your boiler?
We diagnose and repair boiler leaks quickly, before they cause bigger damage.
Need a Gas Safe engineer today?
Same day callouts across Central and West London, fixed quotes and fully guaranteed work.
Why early detection matters
Boiler leaks can come from several places — the pressure relief valve, internal seals, pipe joints, or the heat exchanger itself. Left unchecked, even a small leak can cause water damage to floors and ceilings, corrode internal components, and eventually lead to a full breakdown.
Warning signs to watch for
- Damp patches or staining on the wall or floor near the boiler
- A pool of water or drips underneath the unit
- Boiler pressure dropping repeatedly
- Rust or corrosion marks on pipework
- A musty smell near the boiler cupboard
Why we do not recommend the popular online fixes
| Common online advice | Why it falls short |
|---|---|
| “Tighten the pipe fittings yourself” | Overtightening can damage seals further or cause a bigger leak, and does not address internal component leaks. |
| “Use sealant or leak-stop products” | These can mask the problem temporarily while damage continues elsewhere in the system. |
Stop and call us now if…
- You see any visible water near the boiler
- Pressure keeps dropping and needs regular topping up
- There is a burning or musty smell near the unit
- The boiler is making unusual noises alongside the leak
What it costs to wait
Water damage to floors, walls and ceilings can be far more expensive to repair than the original leak, and a leaking boiler that keeps losing pressure eventually stops working altogether. Catching it early is almost always the cheaper outcome.
How Olia’s Plumbing & Heating handles it
- Call 020 7183 4810 and describe what you have noticed
- Our engineer inspects the boiler and surrounding pipework
- We identify the exact source of the leak
- We repair it and confirm the system is holding pressure correctly
Get your boiler leak fixed properly
Fast response across London before small leaks become big repairs.
Frequently asked questions
Is a boiler leak dangerous?
It is not usually an immediate safety risk, but it can cause water damage and points to a fault that will worsen if left.
Can I fix a boiler leak myself?
We would not recommend it — the source is often inside the boiler or in pressurised pipework, and needs proper diagnosis.
How much does it cost to fix a boiler leak?
It depends on the source. Call 020 7183 4810 and we will inspect it and give you a clear price before starting any work.
Do not wait for a small drip to become a big repair. Call 020 7183 4810 today.
Related services: Boiler Repair Central London, Signs Your Boiler Needs Repair, Boiler Service London
Peyman
CEO & Founder — Gas Safe Registered Engineer
Peyman is the founder of Olia's Plumbing & Heating, a London based team with over 15 years of hands on experience in boiler installation and repair, central heating, gas work and emergency plumbing. He personally oversees jobs across Central and West London and writes these guides to help homeowners understand their heating systems.
- Gas Safe Registered
- 15+ years experience
- Covering all of London
