What do you do if your hot water pipe freezes but not cold?

Author: Chadrick McKenzie  |  Last update: Tuesday, August 19, 2025

Attempt to warm up the pipe. You can do this by applying heat to the section of the pipe using an electric heating pad, hair dryer, space heater or towels soaked in hot water. Never use a blow torch or any other open flame device when thawing pipes.

What do you do if your hot water pipe is frozen but not cold?

Open a Hot Water Valve

By opening faucets, water will have a path to flow as the pipe unfreezes. Steam will also need a place to go as heat is applied. As the pipe thaws, running water will accelerate the defrosting process. Therefore, it's beneficial to have faucets running until the pipe is completely thawed.

How can I unfreeze my hot water line?

Here's a quick lesson on how to thaw a frozen pipe.
  1. Turn on the faucet. Keep it running. ...
  2. Apply heat to the frozen area. Slowly apply heat using a hair dryer. ...
  3. Continue to apply heat. Don't stop heating until the full water pressure is restored. ...
  4. Check all faucets and prevent pipes from freezing in the future.

Should I turn off my hot water heater if my pipes are frozen?

Do NOT turn the water off unless there's an actual leak. The correct thing to do is to run the water 24/7 until temperatures rise.

Will frozen hot water pipes thaw on their own?

Your pipes will eventually begin to thaw on their own once the temperatures rise above freezing.

How to Thaw Frozen Water Pipes

Will pouring hot water down drain unfreeze pipes?

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. If a frozen drain line ruptures, turn off your home's main water supply.

Will shutting off water keep pipes from freezing?

Prevent Frozen Pipes

Moving water keeps pipes from freezing. Find shut off valves for emergencies. Insulate pipes in unheated areas. Open cupboards and vanities to warm pipes.

How long does it take a heater to unfreeze pipes?

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.

What to do with a hot water heater during freeze?

Drain the water heater. Disconnect the power and gas supply. Shut off the cold water supply.

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.

How do you unblock a hot water line?

Clearing The Blockage
  1. Step 1: Shut off the water supply. ...
  2. Step 2 Drain the system. ...
  3. Step 3: Find the blockage. ...
  4. Step 4 Clearing minor blockages. ...
  5. Step 5: Disassemble the pipes. ...
  6. Step 6: Clean the pipes. ...
  7. Step 7: Reassemble the pipes. ...
  8. Step 8: Flush the system.

Should you open faucets if pipes are frozen?

Thawing Frozen Pipes

While you wait, reduce water pressure by opening all the faucets inside the home one-quarter turn. Water will begin to trickle out, helping the ice to thaw. Remember to close all faucets after full water pressure is restored.

How do you unfreeze a hot water line?

Use a hair dryer or heat gun to slowly thaw the pipe.

If the pipe is exposed and you have a section that's frozen, turn on a hair dryer and run it back and forth along the frozen pipe. Keep it moving and do not place the dryer directly against the pipe, as uneven or sudden heating can rupture the pipe.

Will a frozen hot water pipe burst?

When a pipe freezes, the water inside the pipe expands as it turns to ice, which can cause the pipe to crack or even burst. As the ice blockage grows, it can also cause increased pressure within the pipe, leading to further damage.

Why does the hot water line freeze first?

A more mundane explanation is that hot water evaporates faster than cold, decreasing its volume and thus the time it takes to freeze. Cold water also could contain more dissolved gases, which lower its freezing point.

How do I know if my hot water pipe is frozen?

No water or a slow trickle when a faucet is used. Whistling and banging coming from pipes, or strange bubbling sounds when you flush a toilet. Dampness, puddles, or rings on drywall or ceilings—signs of an urgent issue.

Will my pipes unfreeze on their own?

Pipes will eventually unfreeze on their own naturally, but this takes far more time and before thawing occurs the freezing could become much worse. This could eventually lead to the pipe bursting and causing significantly more damage. It's better to proactively thaw a frozen pipe size than let it persist.

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.

Can hot water pipes freeze but not cold water?

The temperature of icy winter can cause the hot water pipes to freeze or even crack. It is a strange thing that hot water pipes freeze quickly than cold water pipes. By increasing the temperature of your house, you can attempt to unfreeze the frozen pipe.

Should I turn my water heater off if my pipes are frozen?

Frozen pipes can cut off your home's water supply and cause damaging leaks. In many cases, the help of a plumber is needed to resolve the problem. To prevent further damage, it is generally recommended that you turn off your main water supply valve and your water heater until repairs have been made.

Should you turn off water heater during freeze?

Frozen pipes can cause serious water damage to your home. The warm water your heater produces will continue circulating your system and prevent the leaks, cracks, and burst pipes that freezing can cause. Leave your water heater on to avoid frozen pipes and accompanying damage to your property.

What not to do when your water pipes freeze?

Don't ever try to thaw pipes with a:
  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.

Should I just turn off water to the house if it's going to freeze?

DURING freezing weather:

If you plan to be away from home for several days, shutting off the water can reduce the chances of broken pipes. Set your home heat to at least 55 degrees. Shut off water to the house and open all faucets to drain pipes; flush the toilet once to drain the tank, but not the bowl.

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.

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