They've covered the possibilities... voltage, thermostat, heating element...
Running the electric heater with no water in tank can overheat/burn out the element. Never know what the previous owner did.
Cheapest way to run is electric if you aren't paying the electric bill - ie - included in camping rates... Otherwise depends on local rates and gas prices.
Fastest way is to use both... also can allow for longer showers.
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Greg
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
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