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306 Ad Romans heated water in large baths.
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A painter named Benjamin Waddy Maughan invented the gas geyser instantaneous water heater.
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A man named Edmund Rudd used Mr. Maughan´s ideas and upgraded the design to include safety features.
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There were a lot of more designs including the electric and solar.
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Now we have way more styles including high efficiency water heaters that use less energy but produce the same amount of water or sometimes more water.
