How do you unfreeze a trap?

Author: Prof. Eleanore Keeling  |  Last update: Wednesday, February 18, 2026

The job goes more quickly by pouring hot water or a mixture of vinegar, baking soda and salt water down the drain. Space heaters, hair dryers and heating pads are highly efficient tools for unfreezing a drain pipe.

Can you pour hot water down the drain to unfreeze pipes?

Pipe-thawing options: There are several things you can do to thaw your home's pipes. Here's a list: Probably the most popular and safest pipe-thawing option is to use hot water.

How do you fix a frozen p-trap?

Simply pour a handful of salt down your drain pipe, quickly followed by boiling water. Alternatively, boil the water in a saucepan and stir the salt in the boiling water. Once the salt has completely dispersed, carefully pour it down the drain.

How do you unfreeze pipes you can't reach?

If possible, locate the section of pipe that is frozen and thaw it yourself using gentle heat (slowly warm it up). If you heat the pipes up too quickly, they can crack or melt due to the quick change in temperature! Try wrapping an electronic heating pad around the pipe, heating the area with a hair dryer, or both.

What do plumbers use to unfreeze pipes?

Tip #7: A Thaw Machine Will Be Your Savior

It's exactly what it sounds like: a portable device that plumbers use to thaw pipes quickly.

How to Fix a Frozen Bathtub Drain (Without Ruining It!)

Will frozen pipes unfreeze on their own?

Frozen pipes will eventually thaw on their own, but it could take days or even weeks. If New York City is experiencing a brutal cold snap, the temperature could stay below freezing for many days. Meanwhile, the water in the pipes could be expanding.

Should I turn off water if pipes are frozen?

Thaw Frozen Pipes

Turn off the water immediately at the main shut off valve. Open the faucet so that water will flow through the pipe once the area is melted. This will help melt more ice.

How do I unfreeze my hidden pipes in my house?

Apply heat to the pipe.

You can also use a small heater or heat lamp. If there is no electrical outlet, boil some water and soak a few towels in it. Wrap the pipe with these towels. When the towels cool, repeat the process until the pipe is completely thawed.

How much does it cost for a plumber to unfreeze pipes?

As long as your frozen pipes haven't burst, a plumber will likely charge a flat fee of around $100 to thaw them out. However, the cost to repair burst pipes tends to be much higher and will ultimately depend on the extent of the damage. Expect to pay $500 on average, which includes the diagnosis and the repair itself.

Do pipes always burst when they freeze?

While subfreezing temperatures pose serious dangers for your pipes, not every frozen pipe will burst. However, older pipes, exposed pipes, and uninsulated pipes are much more likely to burst during extended cold spells.

How to thaw a P-trap?

Pouring hot water will thaw in most cases. Use a plunger ( the kind used to unclog a commode.) while pouring the water.

How do you tell if a drain pipe is frozen or clogged?

  1. 5 Signs You Might Have a Frozen Drain Pipe. thogan. ...
  2. 1 Visible frost on a pipe. ...
  3. 2 Strange sounds coming from the pipes. ...
  4. 3 Unpleasant smells from the pipes. ...
  5. 4 Weak water pressure or no running water at all. ...
  6. 5 Keep an eye out for leaks.

Will a frozen P-trap crack?

Deeper P-Traps could be used, but they would require more space close to the fixture, so the HepvO sanitary waste valve with its slimline design is an ideal alternative in this situation. In cold climates the water in a p-trap is likely to freeze, block with ice and potentially crack.

Can I flush my toilet if my pipes are frozen?

In most cases, no. Attempting to do so can cause pressure buildup in the pipe and lead to bursting. Additionally, flushing a toilet with a frozen pipe can result in unsanitary conditions due to a lack of proper drainage. Turn off the water supply and address the frozen pipe before attempting to use your toilet again.

Will turning up the heat unfreeze pipes?

Turn the Heat Upin the Property: You can attempt to thaw the frozen pipe by increasing the temperature in the property. Turning the thermostat up may be all that is needed to allow the ice blockage to melt.

How to find where pipes are frozen?

Turn on all faucets: Checking each faucet in your home will help you narrow down your search. The faucets that have little or no water pressure likely have a frozen pipe in their supply line. If every faucet is showing low water pressure, the frozen pipe may be near the water meter.

How long do pipes take to unfreeze?

An increase in indoor temperatures can help unfreeze all your indoor pipes, whereas your outdoor pipes may take longer. In many cases though, using the right heating tools can unfreeze your pipes in a matter of 30-45 minutes.

How to thaw a pipe you cannot access?

If the pipe is behind a wall, you can turn up the thermostat and wait for the thaw. Or you can hook up a lamp to warm the area. Infrared lights work best because they don't warm the air, just the pipes behind the wall. If the pipe is exposed, you can heat it with a hairdryer.

Why do plumbers freeze pipes?

Pipe freezing, in the hands of professional plumbers, provides a remarkably effective and efficient solution for emergency repairs and maintenance. By employing specialized equipment and techniques, they can temporarily halt the flow of water, preventing further damage and significantly reducing repair costs.

Should I turn my faucet on if my pipes are frozen?

Keep the faucet open. As you treat the frozen pipe and the frozen area begins to melt, water will begin to flow through the frozen area. Running water through the pipe will help melt ice in the pipe.

How do you unfreeze pipes without bursting them?

If you have frozen pipes in your home, it can be tempting to try to heat them up as quickly as possible, but this could cause them to burst. Instead, use tools like a hairdryer, space heater, and even your home's thermostat to gradually warm the pipes.

Will running hot water unfreeze pipes?

Applying Heat to Frozen Pipes

Here's what you should do to thaw out those pipes. Open the faucets. As the pipes heat up, the running water will further assist ice in melting.

What not to do with frozen pipes?

Do NOT Use These Methods To Thaw Frozen Pipes
  1. Blowtorch.
  2. Gas heater.
  3. Kerosene heater.
  4. Propane heater.
  5. Other open flame appliances.
  6. Any device near insulation.
  7. Electric device with extension cord.
  8. Electric heater, blow dryer, or other device near water.

Do pipes burst when they unfreeze?

Freezing and thawing water inside your pipes can cause them to rupture, leading to extensive water damage in your home. If you have had issues with frozen pipes in the past, there are steps you can take to minimize the risk in the future.

What do I do if my pipes are still frozen after 2 days?

If your pipes have been frozen for more than two days, shut down your home's water supply. Locate the frozen length using touch, sight and sound. Make sure the pipe hasn't burst, and open indoor faucets. Unfreeze the pipe using a hair dryer, heat tape, space heater or heating pad.

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