What is a good standard hot water temperature, primarily for safety reasons?

What is a good standard hot water temperature, primarily for safety reasons?

• A. 120F
• B. 130F
• C. 140F
• D. 150F

Answer: (A)

Setting domestic hot water to a temperature that minimizes the chance of scald injuries is the primary safety goal. A value of 120°F (49°C) is widely recommended because it is hot enough to be useful for most uses, but not so hot that brief contact can cause a severe burn. The burn risk increases rapidly as the temperature rises: at higher temps like 130–150°F, a burn can occur in seconds with even short exposure, whereas at 120°F it would take much longer, often minutes, to cause a serious burn. This balance makes 120°F the best standard for safety. If faster hot water is needed at fixtures, mixing valves can bring the delivered temperature down to 120°F while the stored water is kept hotter for disinfection, if required.

Setting domestic hot water to a temperature that minimizes the chance of scald injuries is the primary safety goal. A value of 120°F (49°C) is widely recommended because it is hot enough to be useful for most uses, but not so hot that brief contact can cause a severe burn. The burn risk increases rapidly as the temperature rises: at higher temps like 130–150°F, a burn can occur in seconds with even short exposure, whereas at 120°F it would take much longer, often minutes, to cause a serious burn. This balance makes 120°F the best standard for safety. If faster hot water is needed at fixtures, mixing valves can bring the delivered temperature down to 120°F while the stored water is kept hotter for disinfection, if required.