Water heater temperature settings
All water heaters come with a factory preset temperature setting of 60° C (140° F). This is the manufacturer’s recommended setting and provides the right temperature for washing, bathing and for bacteria control.
However, hot water can produce severe burns. If scalding is a concern with children or the elderly, a qualified professional can adjust the temperature to no lower than 50° C (122° F).
You can also install anti-scalding devices on shower heads, faucets and bathtub spouts to shut off the water flow if the temperature exceeds 49° C (120° F). A master mixing valve can also be installed at the hot water line running from the water heater. These devices provide a safe compromise that allows your water heater to be operated at 60° C (140° F) for bacteria control, while delivering actual water to be used at less than 50° C (122° F).