Really nice energy saving tip I received the other day.
"Reduce your water heater temperature from 140f to 120f. you will not notice much difference and you will not have to mix cold water to bringdown the temperature of really hot water."
"Reduce your water heater temperature from 140f to 120f. you will not notice much difference and you will not have to mix cold water to bringdown the temperature of really hot water."
"Legionella will grow in water at temperatures from 20 to 50 °C (68 to 122 °F)."
130 °F sounds like a safer compromise.
FWIW, my tankless water heater cannot be set any hotter than 120.