Q: Can I pour boiling water down the drain if I have a metal sink? A: While metal sinks can withstand high temperatures, it's still not recommended to pour boiling water down the drain. The pipes and drain lines beneath the sink can still be damaged by the hot water.
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In kitchen sinks, food residues, bacon grease, and fats solidify inside pipes, narrowing the pathway. Boiling water melts these solidified fats, allowing them to wash away, thus tackling minor clogs.
—which is only rated for temperatures far below the 212°F ( ) of boiling water. The Science of Why It’s Dangerous
For deep or stubborn clogs, a manual hand auger (drain snake) physically hooks and pulls out hair, food debris, and soap scum without relying on corrosive chemicals or high temperatures that compromise your pipes.
Plug the drain and let the fizzing reaction sit for 15 minutes. Flush with (not boiling). Use a Plunger or Drain Snake
If your home is older and still features copper, galvanized steel, or cast iron pipes, boiling water generally won't cause structural damage. Metal has a much higher melting point than plastic. However, even with metal pipes, you aren't entirely in the clear (more on that below). Common Myths About Boiling Water and Clogs Myth: It Melts Away Grease