What is the recommended temperature for a residential water heater?

The recommended temperature for a residential water heater is 120 degrees Fahrenheit for several important reasons related to safety and efficiency. At this temperature, water is hot enough to prevent the growth of bacteria, such as Legionella, which can thrive in colder water. Additionally, 120 degrees Fahrenheit is generally considered to be a safe temperature that reduces the risk of scalding accidents, particularly for young children and elderly individuals who may have sensitive skin.

Moreover, this temperature strikes a balance between energy efficiency and user comfort. Lowering the water heater's temperature to 120 degrees can also lead to energy savings, as it requires less energy to maintain that temperature compared to higher settings. While some might argue for hotter temperatures for better performance, those higher settings can increase the risk of burns and lead to higher energy costs without significant benefits for most household uses. Therefore, 120 degrees Fahrenheit is the optimal setting for residential water heaters, ensuring safety and efficiency for households.