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The most common regulatory standard for the maximum temperature of water delivered by residential water heaters to the tap is 120 degrees Fahrenheit/48 degrees Celsius. At this temperature, the skin of adults requires an average of five minutes of exposure for a full thickness burn to occur.The most common regulatory standard for the maximum temperature of water delivered by residential water heaters to the tap is 120 degrees Fahrenheit/48 degrees Celsius. At this temperature, the skin of adults requires an average of five minutes of exposure for a full thickness burn to occur. Most adults will suffer third-degree burns if exposed to 150 degree water for two seconds. If a homeowner has a commonsense temperature setting on the hot water heater, then a special mixing valve is not necessary at the hot water heater or shower. Keep it turned down, you don't need the water near boiling when it comes out of the tap! If a homeowner has a commonsense temperature setting on the hot water heater, then a special mixing valve is not necessary at the hot water heater or shower.#Other added expenses such as water softeners#Other added expenses such as a water softener