boiler
US /ˈbɔɪ.lɚ/
UK /ˈbɔɪ.lɚ/

1.
a fuel-burning apparatus or container for heating water
:
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The old boiler in the basement needs to be replaced.
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We had no hot water because the boiler broke down.
2.
a strong metal container in which water is heated to make steam, for example in a steam engine
:
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The steam locomotive's boiler was a marvel of engineering.
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Safety regulations are strict for industrial boilers.