A frozen pipe should be warmed gradually and in a controlled way. Before applying heat, identify the affected section and be ready to shut off the water because a split pipe may begin leaking as soon as the ice melts.
Open the faucet served by the pipe
Leave the affected hot or cold faucet open so water and pressure have somewhere to go as the ice melts. If you are unsure which pipe serves it, locate the cold section before heating random areas.
Warm from the faucet side first
Work from the thawed side toward the blockage using a hair dryer, warm towels, or an appropriate heating pad. This order lets meltwater escape rather than becoming trapped behind the frozen section.
Never use flame or extreme heat
A torch, open flame, or aggressive heating can start a fire, damage piping, and create pressure from steam. Do not use electrical heating devices where standing water or wet contact creates an electrical hazard.
Check for leaks as flow returns
Watch joints and nearby walls as water begins flowing again. If a leak appears, shut off the main supply. A concealed pipe, visible split, or inaccessible frozen section is a good reason to call a plumber.
Sources
- American Red Cross — Preventing and Thawing Frozen Pipes — Frozen-pipe prevention and gradual thawing methods without open flame.