Not getting enough hot water
The answer different if you have: concerns about diseases, a dishwasher, young children or elderly that can be easily burned, electric vs. gas heat, type of plumbing (e.g. PEX or Copper).
In 1988, the Consumer Product Safety Commission recommended that water heater manufacturers preset the maximum temperature at 120 degrees Fahrenheit to prevent burns. Since several states have mandated this maximum temperature.
SOURCE: not enough hot water. I have an Amtrol Extrol coil water heater
Since you mentioned 'both temperatures' it seems your unit is like most all of them, a lower and upper coil.
If your hot water supply runs out quickly, this normally means that the lower coil has failed.
Since heat rises, the upper coil will never supply a tankful of hot water, just hot to start, and then as the flow continues, it doesn't have time to do more than warm the water flowing into the tank.
Every home should now own a simple digital multimeter; they cost less than $20 US everywhere and one can find them in auto parts stores, electronic supply companies and tool companies.
If you have a Harbor Freight tool store in your area, you can get them for under $10 US any time and sometimes even less:
Digital meter
You need to be absolutely certain that the voltage to the water heater is shut down.
Before you measure anything else, set the meter to its highest AC setting and check across the coils and then from either contact to the metal housing.
If it is dead everywhere, then set the meter to the lowest Ohms scale (normally 200).
The resistance of the coil should be nearly the same reading as when you simply short the meter's probe tips together.
If it measures 'OL' then the coil is open and must be replaced.
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