5 Hidden Dangers of Pouring Boiling Water Down the Sink For many of us, draining pasta or pouring out the rest of the kettle into the sink is a daily habit we don’t think twice about. However, pouring boiling water directly down the drain carries several risks and consequences that can damage your home and wallet. Here are 5 reasons why you should think twice before pouring that hot water down the drain. 1. Damage to Pipes The first and most important reason is that boiling water can severely da