Frozen Pipe? How to Thaw It Safely (and When to Call)

You turn on the faucet and get a trickle — or nothing at all. In freezing weather, that usually means a pipe has frozen somewhere along the line. The good news: if the pipe has not burst, you can often thaw it yourself safely. Here is how — and when to stop and call someone.

Signs a pipe is frozen

Little or no water from a faucet while others work fine; visible frost on an exposed pipe; a strange smell from the faucet or drain as the blockage traps odors; the pipe feeling extremely cold, sometimes with a slight bulge. The frozen section is usually in the coldest spots — an exterior wall, crawlspace, attic, or garage.

Thaw it safely, step by step

Keep the faucet open. Flowing water helps melt the ice and gives it somewhere to go.
Apply gentle heat, starting at the faucet end. Wrap the pipe in towels soaked in hot water, or use a hair dryer on a low setting, moving it back and forth — never holding it in one spot. An electric heating pad wrapped around the pipe works too.
Work toward the frozen section from the faucet end, not the other way around.
Be patient. Thawing can take 30 minutes or more. Do not rush it with more heat.
Check for leaks along the whole pipe run once water flows normally, and leave the faucet dripping for a while.

NEVER use an open flame

No torches, no kerosene heaters, no propane heaters aimed at a pipe. Open flame near a pipe is a fire risk, it can flash water to steam and burst the pipe, and it damages soldered joints. If a “quick thaw” involves fire, it is the wrong method.

When to call instead

Stop and call a professional if: you cannot find the frozen section; the pipe has already burst or is leaking; there is no water at all anywhere in the house (the main line may be frozen); the frozen pipe is inside a wall you cannot access; or anything feels beyond your comfort level. Call (555) 010-2277 any time — we connect you with an independent local plumber, and the matching service is free.

After it thaws

Check every joint and the full run for drips over the next day or two — a pipe weakened by freezing can leak later. Then prevent a repeat: insulate exposed pipes, seal drafts near plumbing on exterior walls, and in deep cold snaps, let faucets drip and open cabinet doors under sinks.

Frequently asked questions

How do I know which pipe is frozen?

The faucet that will not run tells you which line. Trace it back from the faucet toward the coldest areas — exterior walls, crawlspaces, attics, garages. Frost on an exposed section or an extremely cold spot on the pipe marks the place.

Can I use a hair dryer to thaw a pipe?

Yes — it is one of the safest methods. Use a low setting, keep it moving back and forth, start at the faucet end and work toward the frozen section, and keep the faucet open while you work.

How long does it take to thaw a frozen pipe?

Often 30 minutes to over an hour with gentle heat. Do not rush it with more heat — patience is what keeps the pipe intact.

What if the pipe already burst?

Shut off the main water valve immediately to stop the flooding, then call a plumber — this is past DIY. If there is significant water damage, photograph it before cleanup for your insurance claim.

Should I shut off my water if pipes might freeze?

If you are leaving the house during a deep freeze, shutting off the main and draining the lines is the safest move. If you are home, a slow drip from faucets on exterior-wall plumbing usually keeps water moving enough to prevent freezing.

Will a frozen pipe always burst?

No — many thaw without damage. But freezing weakens pipes and joints, so always check for leaks for a day or two after thawing, and take prevention steps before the next cold snap.