Does water that's been left to sit and then reboiled taste different from fresh water boiled once?

Chris W. Rea
  • Does water that's been left to sit and then reboiled taste different from fresh water boiled once? Chris W. Rea

    This may sound like a silly question, but I've always wondered:

    If I boil some water and use some of it and leave the remainder in the kettle, and then a few days later boil that same water again, will it taste the same as if I'd emptied the old water and boiled fresh new water?

    I've got a habit of emptying the kettle water and starting with fresh water to boil when I prepare my coffee (using a French press), and I'm wondering if there's no good reason to do that.

    For what it's worth, the kettle has a top (so I'm ruling out dust as a concern), and the water I'm boiling is tap water that's been through a Brita filter in a jug.

    If the taste is different, what's the chemical or physical justification?

  • Yes, it is different. Two things happen: the dissolved oxygen boils out, and whatever mineral solids are in there become concentrated as steam evaporates.

  • If it tastes different, it is either evaporating and you're getting a stronger flavor of the same water you drink.

    The other thing is that it may be picking up flavor from the kettle.

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