PVC or plastic pipes can warp or crack
Boiling water reaches temperatures above 212°F (100°C). Many common drain pipes made from PVC (polyvinyl chloride) are rated for lower temperatures and may become soft, brittle, or even warped over time.
Grease solidifies further down the line
While hot water might melt grease temporarily, it often pushes the fat deeper into the pipes, where it cools, hardens, and causes stubborn clogs.
Metal pipes can suffer from seal damage
Older metal piping systems often use rubber seals or joints, which may deteriorate or weaken due to repeated exposure to extreme heat.
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