A hair dryer can be used to apply gradual heat to an accessible frozen pipe. Keep electrical equipment away from standing water and use caution. Never use an open flame to thaw plumbing.
A portable space heater may be appropriate in some circumstances if it is positioned safely and kept away from combustible materials, but it should never be used in a way that creates a fire hazard. For an inaccessible or difficult-to-thaw pipe, calling a plumber is safer.
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