Boiler Leaking Water? Here's What to Do
A leaking boiler should never be ignored. Learn the common causes, what to do right now, and why it needs a Gas Safe engineer.
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Upfront cost — no obligation Water leaking from your boiler or the pipework around it is a problem you shouldn’t leave. Depending on the source, a leak can cause damage to your home, lead to pressure loss, and signal a fault that will worsen over time. A leaking boiler should always be inspected by a Gas Safe registered engineer. This guide covers the common causes and the safe steps to take while you arrange a repair.
What to do right now
If your boiler is leaking: switch the boiler off and turn off the water supply to it if you can locate the valve, soak up or contain the water to protect your home, and avoid touching electrical fittings near the leak. Don’t try to open up the boiler. Then call a Gas Safe registered engineer. If you also smell gas at any point, treat that as a separate emergency and call 0800 111 999.
If your boiler is leaking: switch the boiler off and turn off the water supply to it if you can locate the valve, soak up or contain the water to protect…
Common causes of a boiler leak
Leaks commonly come from corroded or loose pipe joints, a faulty pressure relief valve (which releases water when pressure is too high — often pointing to an expansion vessel fault), a failed pump seal, or internal corrosion of components within the boiler. Where the water is coming from tells an engineer a lot about the underlying problem.
Leaks commonly come from corroded or loose pipe joints, a faulty pressure relief valve (which releases water when pressure is too high — often pointing to…
Why you shouldn't ignore it
Beyond the obvious water damage, a leak usually causes the boiler to lose pressure, which can stop it working. Persistent leaking can also corrode internal components and electrical parts, turning a small repair into a larger one. Addressing a leak early is almost always cheaper than leaving it.
Beyond the obvious water damage, a leak usually causes the boiler to lose pressure, which can stop it working.
We find and fix boiler leaks across East London
Gas First repairs leaking boilers throughout East London and Essex. We trace the leak to its source — joint, valve, pump or internal component — and repair it properly, then check the system holds pressure. Call us as soon as you spot a leak.
Gas First repairs leaking boilers throughout East London and Essex.
Frequently Asked Questions
What should I do if my boiler is leaking?
Turn the boiler off, isolate its water supply if you can, contain the water, avoid nearby electrics, and call a Gas Safe registered engineer. Don't open the boiler yourself.
Why is my boiler leaking water?
Common causes include corroded or loose pipe joints, a faulty pressure relief valve, a failed pump seal, or internal corrosion — an engineer can identify which.
Is a leaking boiler dangerous?
Water and electricity together carry risk, and leaks cause pressure loss and damage. It's not usually a gas danger, but it needs prompt professional repair. If you smell gas, call 0800 111 999.
Can I use my boiler if it's leaking?
It's best to turn it off and arrange a repair. Running a leaking boiler risks further damage and may not work due to pressure loss.
Will a leak make my boiler lose pressure?
Yes — a leak is a common cause of repeated pressure loss, which is often the first sign homeowners notice.
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