OK folks, I am officially baffled. :confused_ The maintenance guys replaced our old water heater with a brand new one (same size, etc) and the hot water STILL runs out after two showers (10 to 15 minutes each, 20 to 30 minutes total). The tank is located in our laundry room, which is heated, so I don't think it has anything to do with the colder weather. If anyone has any ideas, I am all ears.... :help::help::help::help::help: