Can you leave water heater on in camper?

Similarly, you can leave the hot water boiler RV on during the duration of the camp, even if there may be some energy saving advantage to spend it between uses. On the other hand, you will want to make sure you do not turn on the hot water boiler RV with the bypass valve always on.You can leave your RV hot water heater on for the duration of your camping trip, but there may be some energy-saving benefit to turning it off between uses. You will want to make sure you don't power your RV hot water heater if the bypass valve is still toggled.