So upping the temp didn't work? If your are showering back to back(long fifteen, or twenty minute showers), then thirty gal won't do the job. Sorry but if the replacement of the thermostats doesn't work, then check dip tube(not likely), you will most likely have to upsize the water heater. Go to a good plumbing outfit, and give them the measurements of the space you have, let them know that you would like a forty or fifty gallon water heater that will fit in this space. They should be able to find you something To fit your needs. Take care.

