USMC46 wrote:
..... this question assumes we are dry-docking with no electric water heater.
Ok, all you folks that have told how you save propane by using electric, go back and reread the original question. The assumption was NO ELECTRIC as an option.
When traveling, my water heater is heated by the engine coolant so if just an overnight stop, I don't turn the unit on as the water is still warm in the morning. If staying longer, I generally turn it on and leave it on as mine is older and is a manual light vs the more modern electric (12 volt) ignition units.