298 AD – 306 AD There has been evidence of Romans built large baths with heated water and although these were not individual water heaters, this was a first step towards water heating. At the height of its power the Roman Empire had conquered most of Europe, including about 1,600 square miles of Britain, its farthest outpost. And in the ruins of Aquae Sulis, the famed spas of Bath, lay the...

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