Plumbing Tier 1 Practice Exam

Gradually thawing a frozen water pipe with heat is the appropriate course of action because it minimizes the risk of causing damage to the pipe or the surrounding structures. When a pipe freezes, the water inside expands, creating significant pressure that could potentially lead to a rupture. Applying heat evenly and gradually allows the ice to melt without creating rapid changes in temperature, which can stress the material of the pipe and lead to fractures.

Using an open flame to thaw the pipe is dangerous, as it poses a fire hazard and can quickly damage piping materials, especially those made from plastic. Simply replacing the pipe may not address the underlying issue that caused it to freeze and is often unnecessary if the pipe can be repaired. Insulating the pipe may help prevent future freezing, but it does not resolve the immediate problem of a frozen pipe. Gradual thawing ensures safety and preserves the pipe's integrity while restoring water flow effectively.