If the frozen section is under a sink cabinet, you can use directed heat:
PVC melts easily, and cast iron can crack from sudden heat. how to unfreeze a drain
: Never use an open flame to thaw a pipe; it’s a fire hazard and will likely destroy your plumbing. If the frozen section is under a sink
: Use a hair dryer on a low setting, moving it back and forth along the pipe. Never stay in one spot too long, as extreme temperature changes can cause the pipe to burst. Never stay in one spot too long, as
: Stir in about a cup of kosher or table salt to create a concentrated brine.
Dealing with a frozen drain is a rite of passage for many homeowners in cold climates. By staying calm, avoiding open flames, and applying gentle heat, you can safely thaw the blockage and get your water flowing again.