Hi Everyone...first post. I have been told about this awesome site for some time. Had a rookie question. My RV is parked in my driveway but plugged into electric. Its gonna be cold tonite. About 15 degrees. I know thats a heat wave to some but pretty cold here. That said, my water heater is full of water. Should I just leave the electric power on to the water heater so that the water stays hot. Seems pretty basic Q but looking for some peace of mind. All other drains have been drained and I will have the fireplace on tonite as well. Thanks for any insights.