Depending on the size electric water heaters will have either one (for smaller) and two for large or capacity tanks, thermostats. They are usually behind a small door/panel held by one or two screws.
Remove the screws and move aside the insulation to expose the thermostat dial...some are very small and have a slot like the head of a screw to use a screw driver to turn the dial. If there are two panels, both thermostats need to be set.
The recommended setting is 140 degrees.
Be careful not to poke around other than the thermostat setting knob as the connection wires are nearby.....if you don't see them and only see the setting knob, you are safe.
Return the insulation like you found it.
Most handy man types can do this with no problems.
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