I guess it depends upon what "hot" means to a person.
If a water heater's control is set to maintain it's water contents at say, 122 degrees F, and it's temperature sensor kicks in the heating mechanism (propane flame or electric resistance coil) whenever the temperature of the water inside the tank sinks down to around say, 119 degrees F ... then I guess the RV'ers "hot 119 degree water" is being heated hotter to bring it back up to the control's set temperature of 122 degrees.
Note that of course a water heater cycles on and off to maintain the water in it "to around" the set temperature of it's control ... so the (hot) water inside the tank actually varies between two "hot temperature" conditions.
Hence ... what we have is a water heater that spends a lot of time heating water that is "already hot"". That's why I call the water heater in our RV mostly a "hot water heater"!
(Navy RV'ers can call it what they want. :) )
