Sgt Price.....Typically, your new RV should have a propane powered water heater with an electric 110 volt element. Unless you hit really cold weather, the electric element will give you enough hot water for a shower. Leaving the electric element on 24/7 is fine.
The main source of heat for your water heater is propane. If the weather is cold, you may need to fire up the propane to assist the electric element. Many run both the propane and the electric element when people are showering one right after the other or you want an extended shower.
If you find that the electric element is enough, you should still turn on the propane unit occasionally to exercise it.
Don & Mary
2019 Newmar Dutch Star 4018 - All Electric
2019 Ford Raptor Crew Cab