Sequence of electric and gas operation in water heater

It's not the cost but the fact that I have to go get the bottles filled and if it's cold enough it shortens my furnace capacity. When plugged into the campground it just seems better. I just began to wonder and came to the conclusion that a staged set of thermostats would have been a good engineered setup. It would only take a few degree differential, but it seems from what folks have said, it's not the case. Too bad.