Winter may bring frosty mornings and festive cheer, but it can also cause serious plumbing problems. Frozen pipes are one of the most common winter emergencies, often leading to a burst pipe, water damage and costly repairs. In this guide, we’ll explain how to spot frozen pipes, how to unfreeze frozen pipes safely, what to do if you have a burst pipe, and most importantly, how to prevent frozen pipes during cold weather.
What Are the Signs of Frozen Pipes?
If a pipe has frozen, you may notice:
- Little or no water coming from your taps
- Reduced water pressure
- Frost or ice on exposed pipework
- Strange noises from pipes or your boiler
- Damp patches on walls, ceilings or floors
- Your boiler displaying an error code
The sooner you identify frozen pipes, the lower the risk of a burst pipe developing.
How to Locate Frozen Pipes
Frozen pipes are most commonly found in:
- External pipework
- Lofts and roof spaces
- Basements and cellars
- Garages and outbuildings
- Cupboards on external walls
- Under sinks near outside walls
Check Your Condensate Pipe Boiler Connection
A common winter issue is a frozen condensate pipe. The condensate pipe carries acidic wastewater from your boiler to a drain outside. Because it’s often exposed to cold temperatures, it can easily freeze.
A frozen condensate pipe can cause your boiler to stop working completely, leaving you without heating or hot water.
Signs of a frozen condensate pipe include:
- Boiler shutting down unexpectedly
- Gurgling noises from the boiler
- Error codes displayed on the boiler
- No heating or hot water
How to Unfreeze Frozen Pipes Safely
If you’ve identified a frozen pipe, it’s important to thaw it carefully.
- Locate the frozen section.
- Open the nearest tap slightly.
- Apply gentle heat using:
- A hot water bottle
- Warm towels wrapped around the pipe
- A hairdryer on a low setting
- Continue heating until normal water flow returns.
Never use:
- Boiling water
- Blow torches
- Open flames
- Portable heaters placed too close to pipework
Applying excessive heat can damage pipes and increase the likelihood of a burst pipe.
Frozen Condensate Pipe: How to Fix It
If your frozen condensate pipe has stopped your boiler from working:
- Identify the frozen section.
- Apply gentle heat. Use a hot water bottle or a towel soaked in hot water. Avoid boiling water or open flames, which can damage pipes.
- Keep taps open to allow melted water to escape.
If the boiler still fails to restart, contact your local plumber.
What Happens If You Get a Burst Pipe?
When water freezes, it expands. This expansion creates pressure inside the pipe. Even if the pipe doesn’t split immediately, the pressure can weaken the pipework and cause a burst pipe when temperatures rise and the ice melts.
A burst pipe can lead to:
- Flooding
- Structural damage
- Damp and mould growth
- Damage to electrical systems
- Expensive repair bills
What to Do If You Have a Burst Pipe
If you discover a burst pipe:
- Turn off the water supply at the main stopcock.
- Switch off the boiler and electricity.
- Drain your water pipes by opening all taps.
- Contact a professional plumber immediately.
While Waiting for a Plumber
- Move valuables away from affected areas.
- Collect water in buckets or containers.
- Open cupboard doors to allow warm air around pipework.
- Avoid electrical appliances near standing water.
How Do You Prevent Frozen Pipes?
Many homeowners ask, “How do you prevent frozen pipes?” The good news is that a few simple precautions can dramatically reduce the risk.
- Insulate Vulnerable Pipework
Pipe lagging helps protect exposed pipes from freezing temperatures and is one of the most effective ways of preventing frozen pipes.
- Keep Your Heating On
Set your heating to run at a low temperature, even when you’re away from home.
- Seal Gaps and Draughts
Block cold air entering around pipework, vents and external walls.
Small leaks make pipes more vulnerable to freezing and bursting.
A well-maintained heating system is less likely to fail during periods of extreme cold.
- Consider Trace Heating
Trace heating systems apply low-level heat to vulnerable pipes, helping prevent freezing in exposed locations.
How to Drip Water to Keep Pipes From Freezing
A common winter prevention method is allowing a small trickle of water to flow through vulnerable pipes.
- Slightly open the tap furthest from where the water enters your property.
- Allow a slow, continuous drip.
- Keep cupboard doors open to allow warm air to circulate.
- Use this method only during periods of extreme cold.
Moving water is less likely to freeze than standing water, making this an effective temporary solution.
At What Temperature Do Pipes Freeze?
Pipes can begin freezing when temperatures fall to 0°C or below, especially when temperatures remain low for extended periods.
The highest-risk pipework includes:
- Outdoor pipes
- Pipes in lofts
- Garage pipework
- Poorly insulated plumbing
- Condensate pipes
Why Are Condensate Pipes More Vulnerable?
A condensate pipe boiler system often includes narrow external pipework that carries wastewater away from the boiler. Because this pipe frequently runs outdoors and contains a small amount of water, it is particularly susceptible to freezing.
Insulating external condensate pipes can significantly reduce the risk of a frozen condensate pipe during winter.
What If Your Home Will Be Empty?
If you’re away during winter:
- Turn off the mains water supply.
- Drain pipework where possible.
- Keep heating running at a minimum temperature.
- Use a smart thermostat for monitoring.
- Ask someone to check the property regularly.
These simple steps can help prevent frozen pipes and reduce the risk of returning to a burst pipe emergency.
Frequently Asked Questions About Frozen Pipes
Do Frozen Pipes Always Burst?
No. However, the longer a pipe remains frozen, the greater the chance it will develop a crack or burst.
Think you may have a frozen pipe? Contact Metro Plumb for fast advice before a small issue turns into a costly burst pipe.
Will Frozen Pipes Thaw Naturally?
Eventually yes, but waiting increases the risk of a burst pipe and water damage. Controlled thawing is always recommended.
Need help thawing frozen pipes safely? Our experienced plumbers are available 24/7 to help restore your water supply.
Does Leaving the Heating On Prevent Frozen Pipes?
Yes. Maintaining a consistent indoor temperature is one of the most effective ways to avoid frozen pipes.
Want to protect your property this winter? Book a boiler service or speak to our team about preventative maintenance.
How Do You Prevent Frozen Pipes in Extremely Cold Weather?
Insulate pipework, keep heating on, seal draughts, and know how to drip water to keep pipes from freezing during severe cold snaps.
Prepare before temperatures drop. Contact Metro Plumb for expert advice on preventing frozen pipes and winter plumbing emergencies.
Need Help with Frozen Pipes or a Burst Pipe?
If you’re dealing with frozen pipes, a frozen condensate pipe, or a burst pipe, Metro Plumb can help. Our experienced plumbers operate nationwide and are available 24/7 to respond to plumbing emergencies.
Call 0808 250 9949 or find your local plumber.