How Do I Thaw Frozen Pipes Without Breaking Them?
Last updated October 25, 2026
The short answer
Start with Safety
Before you touch anything, locate your main water shutoff valve and know how to turn it off. If a pipe has already split, water can spray and cause rapid damage, so shutting off the supply first is critical. Keep the valve location written down in case of an emergency.
Open the faucet connected to the frozen pipe before you start thawing. This relieves pressure in the line, which is the main reason pipes burst during freezing. Running water also helps melted ice escape as it turns to liquid, so the thawing process moves faster and safer.
Apply Gentle Heat
Use a hair dryer, a portable space heater, or a heat lamp aimed at the frozen section. Move the heat source back and forth to warm the pipe evenly, never letting it sit in one spot for too long. Keep the heat on low or medium to avoid overheating the pipe material.
Wrap the pipe with towels soaked in hot water if you don't have a heat source handy. Re-wet the towels as they cool. For exposed pipes, you can also use an electric heating tape designed for thawing, but follow the product instructions carefully.
- Open the faucet first
- Use a hair dryer on low heat
- Wrap with hot wet towels
- Never use an open flame
- Keep heat moving along the pipe
- Check for leaks after thawing
Avoid Common Mistakes
Never use a blowtorch, propane heater, or any open flame to thaw a pipe. The heat can ignite nearby materials or cause the pipe to burst violently. Also avoid using a high-heat setting on a heat gun, as that can melt plastic pipes or damage solder joints on copper.
Don't leave the heat source unattended. If you need to step away, turn it off and resume later. Patience is key; thawing can take a while depending on the pipe length and temperature. Rushing with high heat is the fastest way to cause a break.
When to Call the Pros
If you cannot locate the frozen section, or if the pipe remains blocked after trying gentle heat, it's time to call local water damage pros. They have specialized tools like infrared cameras and pipe-thawing equipment that can identify the blockage without causing damage. They can also handle the cleanup if a pipe has already burst.
A burst pipe can release gallons of water into walls, floors, and ceilings. In that case, shut off the water, turn off electricity to affected areas if safe, and call the pros immediately. Water damage spreads quickly, and prompt action reduces the extent of the damage.
- You can't find the frozen spot
- Pipe is still blocked after heating
- You see cracks or water stains
- Water is leaking near the pipe
- You need help with cleanup
Prevent Future Freezes
Insulate exposed pipes in crawl spaces, attics, and garages with foam pipe sleeves or heat tape. Seal any gaps in walls or foundations where cold air can reach pipes. During extreme cold, let a faucet drip slightly to keep water moving, which helps prevent freezing.
Keep cabinet doors open under sinks to allow warm air to circulate around pipes. If you plan to be away, set your thermostat to at least 55 degrees Fahrenheit. These steps are simple but effective, and they reduce the risk of dealing with a frozen pipe again.
Need help right now?
Call (801) 383-0232 any time, day or night, and describe what happened.
Call Now (801) 383-0232Frequently asked questions
How long does it take to thaw a frozen pipe?
Thawing time varies with pipe material, length, and how cold it is. A small section might thaw in a few minutes with a hair dryer, while longer runs can take an hour or more. Work slowly and check progress regularly.
Can I pour hot water on a frozen pipe?
Yes, you can pour hot water over the pipe, but it's messy and can cause burns if it splashes. Use a kettle or pot, and place a bucket underneath to catch the water. This method works for exposed pipes, but be careful not to scald yourself.
What if the pipe bursts while thawing?
Shut off the main water valve immediately to stop the flow. Then turn off electricity to the affected area if it's safe. Call the pros to handle the cleanup and repairs. Do not attempt to fix a burst pipe yourself unless you're experienced.