Showers are typically limited to a maximum temperature of 120 degrees Fahrenheit (49 degrees Celsius) to prevent scalding.
The 2021 International Residential Code, widely adopted in the United States, mandates that shower and tub-shower combination valves have a maximum temperature setting of 120°F. This code also requires installers to adjust the valves after installation to guarantee the water temperature does not exceed this limit. This is a safety measure to prevent accidental scalding, especially for vulnerable individuals like children and the elderly.
Why this temperature? Prolonged exposure to temperatures higher than 120°F can cause burns. The higher the temperature, the less time it takes for a burn to occur. For instance, at 150°F, it takes only two seconds to cause a serious burn. Therefore, limiting the maximum temperature significantly reduces the risk of scalding.
While the code specifies 120°F as the maximum, individual homeowners can often adjust their water heater settings. However, it's strongly advised to adhere to the 120°F limit for shower water to ensure safety.
