Originally Posted by sidney
I'm going to have to look at my water heater again. What you explain above makes a lot more sense. Sorry if I caused any confusion.
If your 110v water heater element is coming on with the switch Off, your switch may be fused. This could be possible if you plug into a hot pedestal with the switch on or it could be a defective switch.
You could put a meter on the element and, with the switch off, determine if there is current. If there is, you will need a new switch... under warranty of course.
Hope this helps.
p.s. just pulling your leg about the hot water heater thing. LOL
p.p.s. the Suburban will run with both gas and 110v simultaneously. I do this occasionally when I want hot water immediately after my DW indulges in a Hollywood.