What is the ideal temperature for hot water supplied by a residential water heater?

The ideal temperature for hot water supplied by a residential water heater is 120 degrees Fahrenheit. This temperature is considered optimal for several reasons. First, it provides sufficient heat for domestic tasks such as bathing, dishwashing, and laundry, ensuring effective cleaning and sanitation. It is hot enough to kill harmful bacteria, such as Legionella, yet low enough to prevent scalding, which is a significant concern in households with children or the elderly.

Additionally, maintaining the water temperature at 120 degrees Fahrenheit is energy-efficient, as it helps to reduce energy consumption compared to higher settings. This temperature strikes a balance between safety and efficiency, making it the recommended standard for residential water heaters. Many plumbing codes and safety organizations endorse this temperature to minimize risks associated with burns while ensuring adequate hygiene and functionality for household water use.