Hi B_1962,
If you have a Suburban water heater, I'd suggest you look at our owner-written
Water Heater Troubleshooting Guide.
Also, with Suburban units, there's a secondary switch under the outside cover - lower left-hand corner. If the dealer didn't turn it on, electric operation is inhibited.
And, if the electric side was operation and turned on with no water in the tank, the element would have very quickly burned out and would need to be replaced.
I've deleted your other post as redundant and duplicate posting is not allowed.