said by Bob4:I think avoiding exposure to things like Legionnaire's Disease by setting the water heater to 135 F is a valid trade off to the slight risk of being scalded. The single-handle, pressure balanced faucets makes that very unlikely.
No I think you have it backwards. The slight risk of contracting Legionnaires Disease is very slight. The chance of getting scalded is very high.
There is no rational reason to exceed the CDC recommendation of 120 degrees for the the setting.