How to Thaw Frozen Pipes Safely

Quick answer

Open the faucet first. Locate the freeze. Apply gentle heat from a hair dryer or heat tape — never an open flame. If the pipe has already burst, shut off main water immediately and call a plumber. The whole process takes 30 minutes to a few hours depending on how cold and how deep the freeze is.

Step-by-step

1. Open the affected faucet. Both hot and cold sides if available. This relieves pressure as the ice thaws and lets you see when flow returns.
2. Find the freeze point. Most common locations in Brooklyn Park homes: copper supply lines along exterior basement walls, pipes in unheated crawlspaces, lines under sinks against outside walls (north-facing exposures freeze first), garage water lines, and outdoor hose bibs.
3. Apply gentle heat. Move outward from the faucet toward the frozen section so melted water can drain out. Good heat sources: hair dryer, electric space heater pointed at the wall, heating pad wrapped around the pipe, heat tape. Apply for 15-30 minutes; check for flow.
4. If you can't reach the freeze (it's behind a wall, in an inaccessible crawlspace, or in a slab), keep the faucet open and turn up the home's heat. Call a plumber if no flow returns in an hour.
5. Once flow returns, leave the faucet trickling overnight to prevent re-freeze, and address the underlying cause: add pipe insulation, install heat tape, or have the section re-routed to a heated area.

What NOT to do

• Never use an open flame — propane torch, candle, lighter. Single leading cause of house fires from DIY pipe-thawing in Minnesota. Don't.
• Don't ignore a "dry" faucet on a cold day. A frozen pipe will eventually burst from internal pressure as more ice forms — even if you don't need the water right now.
• Don't pour boiling water on the pipe. Thermal shock cracks copper.
• Don't crank up the temperature suddenly via heat gun. Slow + steady is safer for the pipe.

If a pipe has already burst

Shut off main water immediately (typically in the basement on the wall facing the street). Then turn on every faucet to drain the system. Photo-document for insurance. Move valuables out of the wet area. Then call. Emergency plumbing dispatch is 24/7.

Prevention for next winter

• Insulate pipes in unheated basements, crawlspaces, and attached garages.
• Install heat tape on freeze-prone runs.
• Drain outdoor hose bibs by December — shut off the inside valve, open the outside spigot, let it drain.
• Open kitchen + bathroom cabinet doors during severe cold snaps to let warm air reach under-sink pipes.
• Keep the home above 55°F even when away — pipe protection costs less than a burst.

Need a plumber? (763) 309-6542 for emergencies; frozen pipe repair for prevention work and post-thaw inspection.