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From: Mike Spencer <mds@bogus.nodomain.nowhere>
Newsgroups: misc.news.internet.discuss
Subject: Re: Is it okay to boil water more than once
Date: 20 Jul 2025 04:44:36 -0300
Organization: Bridgewater Institute for Advanced Study - Blacksmith Shop
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JAB <here@is.invalid> writes:

> While the concentration of inorganic compounds might increase as
> drinking water evaporates when boiled, evidence shows it doesn't
> happen to such an extent that it would be hazardous."

The exception might be the household that leaves a tea ketle on the
wood range 24/7, adding water as it steams or boils away.  Normally
50% or more of that water would be used daily but if refilled
repeatedly for days without using much or any, you could get
(estimating here) a 10:1 concentration of anything non-volatile and
non-heat labile.  Any potential risk would depend on pre-existing
borderline levels of heavy metals or very stable organics in the water
source.

There's no risk from using "previously boiled" water.

-- 
Mike Spencer                  Nova Scotia, Canada