Copper does not react with cold water, hot water or steam however iron reacts with steam. If water tanks are made of steel which is an iron alloy than iron would react with steam formed from hot water.

3Fe + 4H₂O →Fe₃O₄ + 4H₂

That is why copper is used to make hot water tanks and not steel.

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Sachit Jayaganesh 5 years, 3 months ago

Because iron will rust.

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