Is it okay to boil water more than once, or should you empty the kettle every time?

By Faisal Hai, Professor and Head of School of Civil, Mining, Environmental and Architectural Engineering, University of Wollongong

The kettle is a household staple practically everywhere – how else would we make our hot drinks?

But is it okay to re-boil water that’s already in the kettle from last time? While bringing water to a boil disinfects it, you may have heard that boiling water more than once will somehow make the water harmful and therefore you should empty the kettle each time.

Such claims are often accompanied by the argument that…

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