What Is the Recommended Temperature Setting for Hot Water Heaters?

What Is the Recommended Temperature Setting for Hot Water Heaters?

The Occupational Safety and Health Administration recommends setting residential water heaters at a temperature of 140 degrees Fahrenheit. The lowest safe temperature allowed for most homes is 120 F.

A water heater set between 130 F and 140 F allows the water temperature at the faucet to stay above 120 F, which is the safe minimum. Lowering the temperature on a residential water heater from 140 F to 130 F is an effective way to save on yearly energy costs, reduce the risk of scalding and prevent corrosion in the hot-water system. However, temperatures below 140 F slightly increase the potential growth of harmful bacteria and the development of Legionnaires’ disease, which can be deadly.