WATER HEATER TEMPERATURE AND USAGE:waterheat.sdcpm.com

1:Per Joe Ortega(ex City of San Diego Code Enforcement) , it is a common practice that all units or residential dwelling be maintained 
    A:Hot water @ 110 degrees
    B:Hot water supply to be a minimum of 15 to 20 minutes of use, with the street pressure. 
2:Anything less than above what is a common practice would be against the Housing Standards-Health & Safety with the State of California.