Hot water systems must supply water at temperatures hot enough to meet 
cleaning demands but not so hot as to risk injury to people. Children, the disabled, and the elderly are most susceptible to hot water-related injuries. Currently, the maximum temperature criteria calls for temperatures to be in the 120-125ºF range.
The risk of scalding or other injury from hot water can be estimated by the exposure time vs the water temperature. The table below indicates the risk of injury to a normal healthy person. Keep in mind that these times are reduced for children, the disabled, and the elderly.
• 120ºF - More than 5 Minutes
• 125ºF - 1-1/2 to 2 Minutes
• 130ºF - About 30 Seconds
• 135ºF - About 10 Seconds
• 140ºF - Less than 5 Seconds
• 145ºF - Less than 3 Seconds
• 150ºF - About 1-1/2 Seconds
• 155ºF - About 1 Second
If your water temperature is in excess of 125ºF, consider adjusting your thermostat accordingly. While individual comfort levels and reaction times vary, according to the water heater manufacturing association, the maximum recommended bathing water is approximately 104ºF.
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