The biggest concern with using the electric is to make sure the water heater is full. If it isn't, the heating element will burn itself out very quickly.
If you're sure it's full of water, then leave the gas off, turn on the electric, and if you get hot water in 10-15 minutes, you'll know it's working.
1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10