When a cold snap hits and a faucet only dribbles, you’ve probably got a frozen pipe. The clock matters: a frozen pipe is also a pipe that can burst, so thawing it safely and quickly is the goal. The good news is most homeowners can thaw a frozen pipe themselves — if you do it the right way and skip the one method that starts house fires.
⚠️ First: open the faucet and find the freeze
Open the faucet the frozen pipe feeds — both hot and cold handles. As the ice melts, water and steam need somewhere to go, and a running faucet relieves the pressure that actually causes bursts. Then find the frozen section: feel along accessible pipes for the spot that’s frost-covered, bulging, or ice-cold. The usual suspects are pipes against exterior walls, in crawl spaces, garages, and unheated basements.
How to thaw a frozen pipe
Once the faucet is open, apply gentle heat to the frozen section, always working from the faucet end back toward the frozen area — never start in the middle, or melting ice can get trapped behind a still-frozen plug and build pressure.
| Method | Safe? | Notes |
|---|---|---|
| Hair dryer | ✅ Yes | The go-to. Move it back and forth along the pipe. |
| Heat gun on low / space heater nearby | ✅ Yes | Keep moving; don’t park heat on one spot or on anything flammable. |
| Hot towels wrapped around the pipe | ✅ Yes | Slow but safe for tight spots. |
| Electrical heat tape | ✅ Yes | Good for a section that freezes every year. |
| Propane torch / any open flame | ❌ Never | Cause of countless house fires, and it can crack the pipe. Don’t. |
Keep heat on it until full pressure returns to the faucet. If the frozen pipe is inside a wall or somewhere you can’t reach, turn the heat up in the house, aim a space heater at the wall, and if water still won’t flow, it’s time to call a pro before it bursts.
If a frozen pipe already burst
If you find a split or you start the thaw and water sprays out, shut the water off immediately. Here’s how to shut off your water main, and my guides on how to stop a leaking pipe and what a burst pipe repair costs if the damage is done.
Stop it from happening again
Frozen pipes are almost entirely preventable. Insulate the pipes in unheated spaces with foam pipe insulation, cover outdoor spigots with a faucet cover, and in a hard freeze let a faucet drip overnight — moving water resists freezing. My full winterize-your-plumbing checklist walks through everything before the cold arrives.
Frequently asked questions
How long does it take to thaw a frozen pipe? With a hair dryer on an accessible pipe, usually 30 to 45 minutes. A pipe inside a wall can take longer as you warm the whole area. Keep the faucet open the entire time.
Will a frozen pipe thaw on its own? Eventually, when temperatures rise, but that’s risky — the danger window is while it’s frozen, because pressure builds and the pipe can burst before it naturally thaws. It’s better to thaw it actively.
Why open the faucet when thawing a pipe? An open faucet relieves pressure as the ice melts. The burst usually isn’t caused by the ice itself but by trapped pressure between the ice plug and a closed faucet, so an open tap removes that risk.
Should I use a torch to thaw a pipe? Never. Open flames are a leading cause of house fires during cold snaps and can damage the pipe. Use a hair dryer, heat gun, or warm towels instead.
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