Boiling Water Down Drain //top\\

You pour boiling water down the kitchen sink. The PVC trap under the cabinet softens slightly. Three months later, you accidentally bang a pot against the pipe. It doesn’t break—it cracks. You now have a slow drip that rots the cabinet floor.

There are a few reasons why people might pour boiling water down the drain: boiling water down drain

Dumping a pot of boiling pasta water down the kitchen sink is a standard culinary reflex, but plumbing experts warn that this common habit can lead to "bellies" in your pipes, melted joints, and expensive leaks You pour boiling water down the kitchen sink

: Can help kill bacteria that cause foul drain odors. Cons: The Risks Can You Pour Boiling Water Down the Drain? It doesn’t break—it cracks

Do not dump the entire pot at once. Pour slowly in a thin stream. This allows the hot water to mix with the cold water in the trap, lowering the overall temperature to a safe 130-140°F—hot enough to melt grease, cool enough to not warp plastic.

Most modern homes use or CPVC piping. PVC is popular because it’s cheap and easy to install, but it has a significant weakness: heat.