Frozen Pipes: How to Thaw Them Safely and Prevent a Burst

Frozen pipe? How to thaw it safely, what not to do and how to stop it happening again. Call 020 8050 9933, open 24/7.

Key facts

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Water expands as it freezes and can split a pipe. Thawing it gently and quickly lowers the risk of a burst. These are the safe steps, and the mistakes to avoid.

How do I know a pipe is frozen?

No water or only a trickle from a tap, and a frosty or very cold pipe, are common signs. A frozen condensate pipe can also stop a boiler working in cold weather.

Turn off the water first

Switch off the water at the stopcock. If the pipe has already split, this limits the flooding when it thaws. Open the affected tap so water can flow as the ice melts.

Thaw gently

Warm the pipe slowly with a hairdryer on a low setting, a hot water bottle or warm towels, starting nearest the tap and working back along the pipe. Keep electrical items away from water.

What not to do

Never use a blowtorch, naked flame or boiling water on a pipe. It can damage the pipe and cause fires or burns. Do not leave a heat source unattended.

Check for leaks after thawing

Turn the water back on slowly and check pipes and joints for leaks and damp patches. If you find a split pipe, turn the water off again and call a plumber.

Prevent it next time

Insulate exposed pipes in lofts, garages and outside walls, fix dripping taps, and keep the heating on low during very cold spells. Know where your stopcock is.

Quick tips

Related help

Common questions

Do you handle frozen and burst pipes at night?

Yes. We take emergency bookings 24 hours a day, 7 days a week. A call-out fee applies, shown before you pay.

How much does a pipe repair cost?

Burst pipe repair is typically £100 - £200 including VAT, plus the call-out fee.

Will insurance cover frozen pipe damage?

Many policies cover damage from burst pipes but terms vary. Check your policy and contact your insurer early.

Call 020 8050 9933