Post By Admin
June 4, 2025You wake up on a winter morning, head to the bathroom to start your day, and nothing comes out of the tap. It also happens to your kitchen sink. It doesn’t take long to realise that your pipes are frozen solid.
And while your first instinct might be to wait it out and let things warm up on their own, you’re probably also wondering, “How long for pipes to thaw naturally?”
In this guide, we’re breaking down everything you need to know, from what influences the thawing time to how to safely speed it up, and what kinds of pipes are less likely to freeze in the first place.
We also recommend checking our plumbing maintenance service to help prevent future freezing issues.
How Long Does It Take for Pipes to Unfreeze?
How long it takes pipes to thaw naturally depends on a few major things: air temperature, pipe location, insulation, pipe material, and water flow.
In general, if the air temperature outside is above freezing (0°C or 32°F), it can take anywhere from 2 to 12 hours for frozen pipes to thaw without intervention.
But if it’s colder than that or the pipes are poorly insulated, how long it takes for the pipes to thaw could stretch well beyond 24 hours.
If the pipe is in a cold crawlspace, inside an exterior wall, or somewhere that gets no sunlight, how long it takes to unfreeze pipes could be significantly longer. On the other hand, if there’s mild sun exposure and no wind, things can speed up slightly.
But here’s the kicker: Can frozen pipes thaw on their own? Yes, they technically can. But it’s not ideal to wait.
Should You Wait for Your Pipes to Thaw?
Here’s the thing. While how long for pipes to unfreeze depends on the situation, waiting it out is risky.
Water expands when it freezes, and that pressure can easily burst your pipes. If they’ve already frozen, that pressure is building.
The longer you wait, the more that ice expands inside your pipes. The damage won’t show until the thaw begins. And by then, it might be too late.
So even though how long it takes water to unfreeze could be just a few hours, it could lead to a flooded mess if you’re not watching.
How to Thaw Your Frozen Pipes Safely
Before we jump into steps, quick heads up: Don’t use an open flame. Ever. Now here are safer ways to do it.
1. Use a Hair Dryer or Heat Gun
If you can access the frozen pipe directly (like under a sink or behind a cabinet), plug in a hair dryer and apply heat slowly. Start at the faucet and work your way backward.
- Keep the dryer moving to avoid melting the pipe.
- Be patient—it might take 15 to 30 minutes to see results.
- This method works best on copper or plastic pipes inside your home.
This reduces how long it takes to unfreeze pipes by several hours compared to doing nothing.
2. Wrap Pipes with Warm Towels
Soak some towels in hot water, wring them out, and wrap them around the pipe. Replace them every 10 minutes.
- This method works for pipes behind thin walls or near crawlspaces.
- Good option when electricity isn’t nearby.
It’s not fast, but it’s safer than open flames and can shorten how long it takes pipes to unfreeze to a manageable time frame.
3. Place a Space Heater Nearby
If the frozen section is behind a wall or in a hard-to-reach spot, place a space heater in the room to warm the general area.
- Make sure there’s no flammable material nearby.
- Don’t leave the heater unattended.
This works slowly but can help overall conditions improve and shorten how long for pipes to thaw naturally.
4. Use Pipe Heat Tape
Heat tape is an electrical strip that you wrap around the pipe, and it warms the pipe slowly but steadily.
- Great for long-term prevention in garages, basements, or crawlspaces.
- Reduces how long it takes for pipes to thaw by providing consistent, controlled heat.
5. Open Cabinet Doors and Let Faucets Drip
If pipes under your sink are frozen, open the cabinet doors to let warm air in and keep the faucet slightly open.
- Moving water helps thaw the ice from within.
- Reduces pressure buildup and bursting risk.
Even a slow drip helps. It reduces how long it takes to unfreeze pipes compared to fully shutting off pipes.
Which Plumbing Pipes are More Freeze Resistant?
Choosing the right pipe type can help you avoid this mess next winter. Here’s how materials compare.
- Copper pipes: Great for hot water. Conducts heat fast, but also freezes fast. If exposed to cold air, it’ll freeze quickly.
- PEX pipes: Flexible and more freeze-resistant. Expands a little when frozen, so it’s less likely to burst.
- PVC pipes: Not ideal for freezing areas. They crack under pressure when frozen.
In cold climates, PEX is often the safest option. And make sure your system is insulated and maintained.
If you’re updating your system, check out our guide on plumbing fixtures to make better decisions.
FAQ About Unfreezing Pipes
If you’re still stuck wondering how long for pipes to thaw naturally, these FAQs will help clear things up.
1. Can pipes unfreeze without bursting?
Yes, but only if the pressure inside isn’t too high. The safest time for a pipe to thaw naturally is when the water has been shut off or left to drip slightly. If the pipe is fully blocked with ice and water pressure builds up, it can burst before you know it.
2. Will running hot water unfreeze pipes?
It can help, but only if there’s a small opening for the water to pass through. If the pipe is fully frozen, water won’t flow at all. Use heat on the pipe instead. Once there’s a trickle, run warm water slowly.
3. Will pouring water down the drain unfreeze pipes?
Nope. If the pipe is frozen inside the wall or underground, pouring water down the drain won’t help and might actually back things up. Use heat from the outside instead.
Conclusion
So, how long for pipes to thaw naturally? It could be a few hours or a full day.
But the longer you wait, the higher the risk of a burst. Take action fast, use safe thawing methods, and think long-term by upgrading your system where needed.
For more tips and help with your frozen or burst pipes, talk to the experts at Neighbourhood Plumbing.
We’ve got the experience and tools to protect your home, no matter the season. Contact us now!
About the Author
From unclogging the toughest drains to repairing leaking toilets, Ricky is a seasoned plumber who has brought his craftmanship to homes across Melbourne. He is passionate about sharing plumbing tips just as much as he is about fixing your plumbing issues. So, when your taps or pipes begin leaking, you know who to call.
