What to Do If a Hot Water Pipe Is Frozen

Apr 11, 2025

Winter brings cold temperatures, and frozen pipes are one of the biggest plumbing concerns during this season. While most people expect cold water lines to freeze, hot water pipes can also be affected. A frozen hot water pipe can lead to restricted water flow, pressure buildup, and even pipe bursts, causing costly water damage.

If you find your hot water pipe frozen solid, don’t panic. Here’s what you need to know and do to fix the issue safely.

Signs Your Hot Water Pipe Is Frozen

Before taking action, it’s important to confirm that your hot water line is frozen. Here are some key signs to watch for:

  • No hot water – If your cold water is running fine but you’re getting little to no hot water, it could mean your hot water pipe is frozen.
  • Frost on pipes – If you can see exposed piping and notice frost forming on the exterior, that’s a clear indicator of a frozen pipe.
  • Strange noises – Whistling, banging, or gurgling sounds coming from your pipes can signal that ice is obstructing the flow of water.
  • Bulging pipes – Ice inside a pipe expands, which may cause visible swelling or bulging.

Immediate Actions to Take

The first steps you take when you discover a frozen hot water pipe can prevent further damage and minimize risk. Do these things immediately:

  1. Turn off the water supply – If you suspect a pipe is frozen, locate your home’s main water shut-off valve and turn it off. This will help prevent water from flooding your home if the pipe bursts.
  2. Open faucets – Turn on the hot water taps in your sinks and tubs to relieve pressure and allow water to flow once the ice thaws.
  3. Inspect for leaks – Check the frozen pipe and surrounding areas for cracks or leaks. If a pipe has burst, turn off the water supply immediately and call a professional plumber.

How to Thaw the Frozen Pipe Safely

Once you’ve taken precautionary measures, the next step is to thaw your frozen water pipe safely. Here are some effective methods to do so:

  • Use a hairdryer – Set a hairdryer to a low or medium heat setting and slowly move it along the length of the frozen pipe. Keep it a safe distance from the pipe to avoid damage.
  • Apply a space heater – Place a small space heater near the affected area to warm the pipe gradually. Follow safety precautions and keep the heater away from flammable materials.
  • Wrap the pipe in warm towels – Soak towels in warm water and wrap them around the frozen pipe to encourage gradual thawing.


Important Safety Tip: Never use an open flame, such as a blowtorch or lighter, to thaw a frozen pipe. This can weaken the pipe, cause a fire, or lead to sudden pipe bursts.

When to Call a Professional Plumber

While many frozen pipe situations can be resolved with the steps above, there are times when you’ll need professional help. Call a plumber if:

  • The pipe has burst or is leaking.
  • You can’t locate the frozen section of the pipe.
  • Your DIY thawing attempts aren’t working.
  • The frozen pipe is inside a wall or hard-to-reach area.

Professional plumbers have specialized tools like pipe-thawing machines and thermal imaging cameras to safely and efficiently resolve the issue.

Prevent Future Freezing

Once your hot water pipe is thawed, take steps to prevent freezing in the future:

  • Insulate pipes – Wrap exposed pipes with foam insulation sleeves or heat tape, especially in unheated areas like basements and crawl spaces.
  • Keep a steady indoor temperature – Maintain a consistent temperature inside your home, even at night, to prevent pipes from getting too cold.
  • Seal gaps and cracks – Check for and seal any gaps in your home’s exterior walls or foundation that allow cold air to reach your pipes.
  • Let faucets drip during extreme cold – Allowing a slow trickle of water to run from faucets can help prevent freezing by keeping water moving.
  • Open cabinet doors – If pipes run inside kitchen or bathroom cabinets, keep the doors open to let warm air circulate around them.

A frozen hot water pipe can be a major inconvenience, but taking swift action can prevent costly damage. If you suspect your hot water line is frozen, turn off the water supply, open your faucets, and use safe thawing techniques to restore water flow. If you need expert help, contact us at Copperhead Plumbing Inc by calling 303-552-3491 for fast and reliable plumbing solutions. Stay warm, stay safe, and keep your water flowing!

Image Credit Besjunior / Shutterstock

 

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