It probably does not have a separate switch for the electric next to the gas switch. That switch is not really needed because you still should have a breaker in the electric panel that will turn off the electric to the water heater if you are wanting to just run on gas, maybe for times that you are connected to a 30 amp service and want reduced load on the electric. This also makes for a simpler system, because with the extra switch to control the electric side, there is also a relay at the water heater that would be controlled by that extra panel switch, and the 12 volts from the switch activates the relay to connect the 120 volts to the electric side of the water heater. Quite a few connections are eliminated by not having that other inside switch and this also reduces costs that would be passed on to the buyers of the rigs. So, this is not something to worry about, and many RV manufacturers do not have use electric switch.
Bob & Becky
2012 Chevy 2500HD D/A CC 4WD