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We use one or both sometimes depending on what power we are on 30 or 50 amp and if showers are done back to back.
If we are on 50 amp, we turn on only the elec and don't worry about running AC etc. And sometimes will turn on the gas heater to help it recover quicker. Then turn it off. It does go faster on gas, but costs.
If we are on 30amp, we do the same, but turn off the elec heater when AC is on etc. Just depends on power.
When we boon dock, its gas all the time. Turned off during the day after showers and dishes are done. It holds enough heat to last the day turned off.
Try out the different ways and you will come up with a good system for you. Just remember to turn both off when you disconnect the water. You need water pressure to the RV or water pump on so the tank is full all the time its on. Also turn off the elec when you don't want it anymore, or the next time you hook up and the power is low, and you crank up the AC, the water heater will be on and trip the breaker on the post.
I changed out that light switch used for the water heater for one with a red light so I can see that its on.
Bill
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