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Re Boil Kettle?


Just went to make a cup of tea, half the kettle is full of tepid water, do you re boil the same water or empty and start again?

My colleague has said reboiled water is rank! Why is it? Coffee drinker myself and we have a coffee machine so don't have to think about it! Image

over a year ago
What do you think of this?+20 points

You might be surprised - i always use fresh!

Ask any coffee or tea connoisseur they always use fresh!

Does Reboiled Water Cause Cancer?

There is a concern that reboiled water may lead a person to develop cancer. This concern is not unfounded. While the boiled water is fine, increasing the concentration of toxic substances may put you at risk for certain illnesses, including cancer. For example, excessive intake of nitrates has been linked to methemoglobinemia and certain types of cancer. Arsenic exposure may produce symptoms of arsenic toxicity, plus it has been associated with some forms of cancer. Even "healthy" minerals may become concentrated to dangerous levels. For example, excessive intake of calcium salt, commonly found in drinking water and mineral water, can lead to kidney stones, hardening of the arteries, arthritis, and gallstones.

MANY of us think nothing of re-boiling water in the kettle to make our morning

cuppa, but it turns out doing so exposes us to some serious health risks

according to health experts.

Most tap waters contain natural chemical compounds, the make-up of which

changes when first boiled.

This is a good thing as it kills any germs and bacteria present in the water.

However, when it is re-heated, the dissolved gases and minerals that have

undergone a chemical transformation amass and become significantly more


Julie Harrison from Improve

Your Health said: “The chemicals in the water get concentrated,

things like nitrates, arsenic and fluoride.

“Every time you reboil the water, they get more concentrated, and you

really don’t want to be having them in your body.”

Nitrates turn into nitrosamines and become carcinogenic. These chemicals have

been linked to diseases like leukemia and non-Hodgkin lymphoma as well as

various types of cancer.

Meanwhile arsenic accumulates which can result in cancer, heart disease,

infertility and neurological problems.

Minerals that are good for us in small doses, such as calcium salts, can be

very harmful when re-boiled and can lead to kidney stones and gallstones.

Worryingly, an increase in the level of fluoride can have damaging effects on

the cognitive and neurological development of children.

Harrison also recommends using filtered water and only as you need it, to

avoid the water sitting in the plastic for any length of time




I did not know this!!! Interesting read will take this into consideration


Thank you lydskyd for sharing this. I all way's recoiled the kettle. But after reading what you wrote. I will now stop it. 18month ago I had a op for gallstones. And I have a lot of trouble with my kidney's. It's made me think twice now. From now on its fresh water to boil. And hope fully I will see a change. 🐧


I have unlimited water where I live for a flat rate fee so I never reboil water, I always drain and refill.


From a taste point of view reboiling is not a good idea. I've heard/read this a number of times from various people who work with tea. Apparently reboiling removes all the oxygen and nitrogen from the water - https://www.telegraph.co.uk/news/2017/03/23/never-boil-water-twice-making-cuppa-tea-guru-warns/

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