Setting your water heater temperature too low
You should never let your water heater temperature fall below 120 degrees Fahrenheit. If you do, you’re opening your home to dangerous bacteria. “At this temperature, harmful pathogens—like the kind that causes Legionnaires’ disease—are prevented from multiplying and may be killed,” says Dawson.
“As the temperature gets higher, pathogens die off quicker. For that reason, other agencies like the Occupational Safety and Health Administration (OSHA) recommend a water heater temperature of 140 degrees Fahrenheit.”
