Hot water heater not staying lit

Why are you trying to heat hot water?

Having to push reset means that the ECO (high temp t-stat) has opened.....either normal t-stat has failed or is not tight against tank wall.

Buy a new 12V DC t-stat set (Normal/ECO) and replace.
Also clean spark electrode with emery cloth, make sure the electrode is engulfed in main flame and that you have 1/8" gap between electrode tip and ground rod, clean out burner tube/burner orifice and make sure all ground wires/contacts are clean & tight.

As for the electric....it has it's own 110V AC T-stat set (Normal/ECO)

The ON/Off switch sounds like it is broken (can not push to OFF position) so you need to replace that switch. And with it suck in ON position electric element may have burnt up. So you will need to check that AC breaker for electric element is ON, 110V power goes to/thru new switch and that you have 110V AC power to/thru t-stats and to/thru electric element

First things first...using a meter, ensure you have 12V to the switch. Even on propane, you need a solid 12V to light it. Second, ensure you have 120V to the electric side. It won't work if you don't. If you have good electrical flow, then start troubleshooting the other stuff. Start with the easy stuff first.....Dennis

had same trouble with mine....took a little emery paper and sanded the thermo couple.....a little sanding....works great....let us know what worked....