How to Prevent Frozen Water Pipes

Water expands when it freezes into ice. Unfortunately, water pipes (usually metal or plastic) don’t. This puts a frozen water pipe in danger of bursting, causing a costly mess. The good news is that you can prevent pipes from freezing in the first place by keeping them warm. If you’re leaving for an extended period of time in the winter, you can and should drain your water lines. On the other hand, if a deep freeze hits your pipes before you can take action, you can thaw them safely.

EditSteps

EditKeeping the Pipes Warm

  1. Wrap heater tapes around the pipes. Buy UL-endorsed tape with a built-in thermostat. This safety precaution will prevent the tape from overheating You can either wrap the tape around the pipes or run them along the length of the pipes. Follow the manufacturer’s instructions to use the tape.
    Prevent Frozen Water Pipes Step 1 Version 3.jpg
    • While you can lay insulation over some tapes, others might cause the insulation to catch fire. Always read the safety information before installing the tape.
    • Alternatively, you could use a heated reflector lamp in a dry enclosed space. On cold nights, check the light to see that it is working.[1]
  2. Insulate all water pipes from cold moving air. Wrap pipes in foam rubber insulation designed for pipes. Make sure that there aren’t any gaps between the pipe and the insulation. Miter any strips of insulation that meet at the corners of pipes. Secure them with duct tape. Keep the foam dry as you insulate.
    Prevent Frozen Water Pipes Step 2 Version 3.jpg
    • Insulation alone doesn’t prevent freezing. It only slows down the transfer rate of heat to cold.[2]
  3. Insulate and heat the drain lines. Apply foam rubber insulation in the same way you insulated the pipes. Pay attention to bathroom and kitchen sinks. Don’t overlook lines in crawl spaces and cold basements. On especially cold days, direct a heat lamp on the drain P-trap.[3]
    Prevent Frozen Water Pipes Step 3 Version 3.jpg
    • If you’re concerned about a fire hazard, keep the cabinet doors beneath the kitchen and bathroom sinks open to allow warm air to circulate around the pipes.[4]
  4. Open the tap on cold days without power. If you lose electric power, let the water run no faster than a slow constant drip. This is cheaper than repairing a burst pipe. First, start a slow drip on the hot side faucet, then a faster drip on the cold side faucet. There is no need to run a lot of water. Bathrooms can be cold, as long as they aren’t freezing.[5]
    Prevent Frozen Water Pipes Step 4 Version 3.jpg
  5. Use a thermal convection-powered hot water recirculation valve. This doesn’t require electricity to operate. It bypasses the drain and continuously circulates warm water through the waterlines. Turn the water off at the main source before installing. Remove the valves under the sink with a mini hacksaw. Use the included connecting joints to attach the valve to the copper fitting from the wall. Secure the fittings to the pipes with a wrench. Switch off the valve whenever you don’t want the water to circulate.
    Prevent Frozen Water Pipes Step 5 Version 3.jpg
    • This method requires that the valve be installed at a higher level (usually the second or third floor) than the water heater.
    • Circulating water throughout your system non-stop will also increase your water heating bill.[6]
  6. Use a RedyTemp. This device uses an internal water contacting temperature probe to monitor the water temperature inside the pipes. Disconnect one end of the existing faucet supply lines. Attach them to the RedyTemp. Connect the two faucet supply lines that come with the device. Plug the unit into a standard wall socket and set the desired temperature set point.
    Prevent Frozen Water Pipes Step 6 Version 3.jpg
    • Gauge the effectiveness of your chosen set point by opening cold water faucets upstream and feeling how cool or warm the water is coming out the tap. Adjust the set point accordingly until optimized. You’ll achieve an optimized set point when cool or warm water stays in the cold water pipes or the portion of pipe requiring protection.
    • If you own a tankless on-demand water heater, you’ll need the TL4000 series model rather than the more common ATC3000. During off seasons when you don’t need circulation, lower the temperature set point.[7]
  7. Adjust the thermostat. Set the home or structure’s thermostat to at least . This will keep the temperature well above the freezing point of water. It will also allow enough warm air to circulate to the attic and behind walls, where pipes are often located.[8]
    Prevent Frozen Water Pipes Step 7 Version 3.jpg

EditDraining Your Water Lines

  1. Locate the main water supply. This consists of two parts. You should find one part near the meter on the street side of your house. The location of the second part depends on where you live. If you live in a warm climate, look on an outside wall or in an underground box. If you’re in a colder climate, look in the basement.[9]
    Prevent Frozen Water Pipes Step 8 Version 3.jpg
  2. Turn off the main water supply. First, open all faucets in the house. Then, shut down both parts of the valve. Make sure that the water flow coming from the faucets stops after a few minutes. If it doesn’t, re-check both parts of the valve and tighten them as best as you can. Call a plumber if you can’t shut off the valve or if any part of the valve breaks.
    Prevent Frozen Water Pipes Step 9 Version 3.jpg
    • If you receive well water, turn off its electrical switch to prevent the well from pumping water inside.[10]
  3. Shut off secondary supply valves. Take this step if you have automatic outdoor watering systems that prevent you from shutting off the main water supply. Look for round or oval handles. Turn the handles clockwise (“righty tighty”) to close the valves. Shut off valves to appliances involved in significant drainage. These include:
    Prevent Frozen Water Pipes Step 10 Version 3.jpg
    • The dishwasher
    • The washing machine
    • The ice maker on the refrigerator
      • Look for this valve either under the sink or in the basement.[11]
  4. Inspect the supply lines. Look for leaks, rust, cracks, and other evidence of damage. If any areas are damaged, replace them with hoses coated in braided stainless steel. These are more durable than rubber hoses. Call a plumber if you need assistance.[12]
    Prevent Frozen Water Pipes Step 11.jpg
  5. Treat the sump pump. Add a battery backup to the pump in the event of a power failure. Pour water into the pit. It should drain the water by itself. If it doesn’t, make sure the pump is plugged in and the breaker is switched on. If it’s still not working:
    Prevent Frozen Water Pipes Step 12.jpg
    • Make sure the motor is running normally.
    • Check the pipe for evidence of freezing or clogging.
    • Clean the discharge line.
    • Call a plumber if all else fails.[13]
  6. Disconnect watering implements from your outdoor spigot. This includes the hose and the sprinkler. Disconnect everything in the winter or before the temperature in your area drops below freezing. The water inside the hose can freeze and back up into the spigot until it reaches your pipes. Any pipe that freezes can burst.
    Prevent Frozen Water Pipes Step 13.jpg
    • You can also replace your spigot with one that prevents the water inside the house from reaching the cold exterior. These frost-free spigots are level with the connecting pipe.[14]
  7. Treat the exterior spigot. You can protect it from causing problems in one of three ways:
    Prevent Frozen Water Pipes Step 14.jpg
    • Wrap it in foam rubber insulation.
    • Open the spigot to drain any excess water from the connecting pipes.
    • Replace it with a spigot that shuts off the supply of water to pipes in the walls.[15]
  8. Call a plumber. If you live in an especially cold climate, ask a plumber to inspect your work to make sure you left no loose ends. Have them also drain the water heater. For an added bit of precaution, you could also ask them to empty water left in drains and traps and replace it with non-toxic antifreeze.[16]
    Prevent Frozen Water Pipes Step 15.jpg

EditThawing Frozen Pipes

  1. Locate the frozen pipe. Turn on each faucet one by one. If none of your faucets works, the frozen pipe is close to or right at the main water supply, usually located on the street side of your basement or in an uninsulated crawl space. Run your hands every few feet along the pipe to find a section that feels very cold. This is the frozen section.[17]
    Prevent Frozen Water Pipes Step 16.jpg
    • If water flows from some faucets but not others, the problem might be in a pipe connected to a specific faucet or a pipe on one side of the house. Check pipes in uninsulated walls first.
    • Keep all frozen taps open until water starts to flow. Then, lower the water to a trickle.[18]
  2. Check the pipe in the area of the freeze. Some plastic or copper pipes will split. This will flood the area when thawed. If the pipe looks burst or has a slit in it, call a plumber immediately. Turn off the water supply, as well as the water heater.[19] If there are no splits, begin the thawing process.
    Prevent Frozen Water Pipes Step 17.jpg
  3. Heat the area around the frozen part. Use an electric space heater, a hair dryer, or a heat lamp in a reflector to prevent a fire. Exercise caution when placing heat-generating devices. Never leave these devices unattended for any amount of time when in use. If you have a problem, call the plumber.
    Prevent Frozen Water Pipes Step 18.jpg
    • Space heaters, heat lamps, and reflective lamps can generate high temperatures, which might cause flammable materials to combust. If you need to place a heat source under the kitchen sink, remove all chemicals first.[20]

EditTips

  • Consider hiring a licensed plumber if you have any reservations about following the steps in this article.
  • If the plumber won’t guarantee their work, seek professionals who will. Refuse to pay if the work is not performed correctly.

EditWarnings

  • Never use any kind of open flame. It may burst your pipes.

EditThings You’ll Need

  • Pipe insulation
  • Heat tape
  • Reflector heat lamp
  • Hand-held hair dryer
  • Thermal convection-powered hot water recirculation valve
  • RedyTemp
  • Wrench
  • Mini hacksaw

EditRelated wikiHows

EditSources and Citations

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