A device or substance that produces or generates heat, or a heating apparatus that transfers thermal energy to water or air.
From Latin 'calor' (heat) and '-fier' (maker or producer), literally 'a heat-maker'—a technical term for industrial heating equipment.
Early calorifiers were the ancestors of modern boilers and heaters—Victorian engineers needed a word for 'the thing that makes heat happen,' so they invented this one!
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