What is the maximum temperature for residential hot water supply?

The maximum temperature for residential hot water supply is typically set at 130 degrees Fahrenheit. This temperature is recommended for several reasons. Primarily, it strikes a balance between providing sufficient heat for typical domestic tasks such as dishwashing and bathing, while also minimizing the risk of scalding injuries, especially for young children and the elderly.

Water temperatures above 130 degrees can significantly increase the potential for scalds, as skin can be burned within just a few seconds of exposure to higher temperatures. Setting the hot water supply at this level helps to enhance safety in a residential setting, aligning with established plumbing codes and regulations that prioritize user safety.

Additionally, a temperature of 130 degrees is efficient in controlling the growth of harmful bacteria, such as Legionella, which can thrive in warm water systems. This temperature helps maintain effective sanitation while also being mindful of energy consumption, as higher temperatures can lead to increased energy costs.

In this context, the other temperature choices, while suitable for certain applications, may pose higher risks or be less efficient for residential use.