What To Do Immediately When Your Boiler Starts Leaking From a Pipe
You’ve spotted it. A slow drip under the boiler. Or worse – a steady trickle running along the pipe and pooling on the kitchen floor. When a boiler is leaking water from a pipe, you don’t have the luxury of “keeping an eye on it.” You need to act. Quickly, but calmly.
Here’s the straight answer: turn the boiler off, contain the water, and check your insurance policy before arranging major repairs. Most UK home insurance policies can help with the resulting damage – but not always the repair itself. That distinction matters.
Let’s walk through it properly.
Why Is My Boiler Leaking Water From a Pipe?
In the UK, most homes rely on gas central heating systems. Over time, parts wear down. Pipes corrode. Seals loosen. Pressure fluctuates. Many people experience a boiler leaking water from a pipe at some point in their life.
Common causes include:
- Corroded or ageing pipework
- Loose joints or fittings
- Faulty pressure valves
- A cracked heat exchanger
- Excess boiler pressure
- Poor installation or previous patch repairs
Combi boilers – like those from Worcester Bosch or Vaillant – are reliable, but no system is immune to wear and tear.
And here’s something many homeowners don’t realise: sometimes the leak isn’t coming from the boiler unit itself, but from connected pipework or valves nearby. It looks like a boiler problem. It might be. But not always.
That’s why diagnosis matters.
What To Do Immediately If Your Boiler Is Leaking
Don’t overthink it. Just follow this order.
1. Turn the Boiler Off
Switch it off at the control panel. If water is actively spraying or leaking heavily, isolate the power at the mains switch for the boiler.
Safety first.
2. Turn Off the Water Supply (If Needed)
If the leak is significant and doesn’t stop when the boiler is off, turn off the water supply feeding the system. For many homes, that’s the internal stopcock.
3. Contain the Leak
Use towels. Buckets. Whatever works. The goal isn’t perfection – it’s limiting damage to flooring, cabinets, or ceilings below.
4. Check the Pressure Gauge
If your boiler pressure is above 2.5 or 3 bar, high pressure may be forcing water out.… Read More









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