Water dripping from the boiler
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Post a job — we'll find you an engineer →⚠️ Do not operate a boiler that is actively leaking. Turn it off and call a Gas Safe engineer.
Water dripping from your boiler is one of those problems that deserves immediate attention — but it's not uncommon, and you're right to take it seriously. Boiler leaks can happen for several reasons: a failed internal component, a blocked condensate pipe, corrosion inside the casing, or a problem with the pressure relief valve. Whether your boiler is fairly new or getting on a bit, a leak signals that something isn't working as it should. This guide walks you through the safe steps to take right now, and explains what a Gas Safe engineer will likely find when they arrive. The key thing to remember is that a leaking boiler shouldn't be left running — stopping it immediately protects both your home and your safety, and gives a professional the best chance of diagnosing the fault quickly.
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Most likely cause & what to check
Turn the boiler off at the programmer or thermostat — do not use it while it's leaking.
Place a towel or container underneath to catch the drips and protect any electrics below.
Call a Gas Safe engineer straight away. Tell them: "Water is dripping from my boiler — I've turned it off. The leak appears to be from [front / underneath / left side / right side]."
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Frequently asked questions
Can a boiler leak cause water damage to my home?
Yes, absolutely. Water dripping onto electrical components, flooring, or into cavities can damage your property and create damp problems. That's why catching it early and placing a container underneath is so important — it buys you time before a professional can attend.
What causes a boiler to leak from underneath?
Leaks from underneath often come from the condensate pipe — a small drain that removes acidic water from the boiler's heat exchanger. If this pipe is blocked, frozen (in winter), or damaged, water backs up and drips out. Alternatively, internal components like the heat exchanger itself may have corroded or cracked.
How much will it cost to fix a leaking boiler?
That depends entirely on what's causing the leak — a blocked condensate pipe might be a quick fix, while a failed heat exchanger or pressure relief valve could mean a more costly repair or even a new boiler. A Gas Safe engineer will diagnose it and give you a quote before starting work.
Why is my boiler leaking water but still under warranty?
Many boiler leaks are covered under warranty if the fault is a manufacturing defect — but this depends on your specific warranty terms and how old the boiler is. Always mention the warranty to your Gas Safe engineer when you call; they'll be familiar with claim procedures and can advise whether it applies to your situation.