Boiling Water Down Drain Verified

Use a plunger or a snake. Never hot water.

A widespread plumbing myth suggests that pouring boiling water down the drain is an effective way to melt away fat, oil, and grease (FOG). While the heat will liquefy grease temporarily, this method actually worsens the problem further down the line. boiling water down drain

If you have an older home with galvanized steel or cast iron pipes, you might think you are safe. You aren't entirely safe—just for different reasons. Use a plunger or a snake

If no hardware → simulate savings: “This boiling water could have preheated 3L of cold water to 60°C. Learn about retrofit kits.” While the heat will liquefy grease temporarily, this

Your pipes are connected by rubber gaskets or wax rings (especially in toilets— never pour boiling water in a toilet). Boiling water can degrade these seals, leading to slow leaks.

To understand the risk, you have to visualize your plumbing system. Your sink isn't directly connected to the main sewer line via a straight metal tube. Most modern homes use a combination of materials.