While people may vary in just how hot they like their showers or baths, or their dish and clothes washing water to be, there are recommended settings, intended to protect people from being scalded by overheated water. Generally speaking, maximum safe output temperature for domestic hot water is 49-52 degrees C (51.7 Celsius).
Much research has been done about safe water temperatures for domestic household uses. Skin burns can occur if water temperature exceeds the recommended settings; and other factors may play a part as well, like sensitive skin, and how long the skin is exposed to the hot water. Skin burns more quickly as the water temperature increases.
Most domestic hot water heating equipment and plumbing system components today are designed to prevent injury, through the incorporation of anti-scalding devices and other protection measures. Building and industry codes address the potential problems, but it is still up to the user to practice caution and common sense. Never attempt to override or disable built-in safety measures.
Appliance manufacturers now install local water "re-heaters", such as in dishwashers and washing machines, where higher temperature water is required for thorough cleaning. These devices increase water temperature locally (to 60 degrees C or more), only for that appliance's cleaning cycles.
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