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I would like to know how heat up a large amount of water ( assumption : 100 liter ) that people could use to take their bath and also it would not be dangerous even if they accidentally ingested it ? .

My idea is that to design a metal container and have the chemical in it . I'll react the chemical that is inside the container and then I'll put the container into the water , which will eventually heat up the water through thermal equilibrium .

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  • $\begingroup$ possible duplicate of Can you heat water with additives? $\endgroup$ – Mithoron May 31 '15 at 12:42
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    $\begingroup$ Why don't you heat it normally, using cooker, boiler, or stove - 100 liter isn't that much. $\endgroup$ – Mithoron May 31 '15 at 13:36
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    $\begingroup$ An appliance exists for this. According to the Lowes website, the smallest hot water heater they sell is 30 gallons, which will be about 115 liters. You can buy heaters up to 80 gallons (~300 litres) or probably larger. $\endgroup$ – Ben Norris Jun 1 '15 at 10:38

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