[Jim W]

I am doing this from my memory so here goes; on my 2010 318SAB there is control wall panel as you enter by the door. The water heater switch is in this panel and I believe it is mark some like DSW… on my unit it is a blue switch. No red markings at all; this switch which is a rocker switch needs to be pushed in at the top for on and off is down. A blue light will light up when the switch is turned on.

BTW the electrical element is enough to keep us in hot water for our needs. I only turn the gas switch on once a season to ensure that it is working. Since I am paying for the electrical service already I do not want to use my propane.
Hope this helps?
Jim W.