POST #38 SAID.....
BTW, tank is 20 gallon, and water heater is 6 gallon.
If you fill the fresh water tank, then fill the water heater tank from the fresh water tank, you'll have just about 2/3rds of your tank left.[/QUOTE]
FYI - I always fill my FWT at the campground when possible. Before filling the tank I hook up to city water inlet and fill the system... Purge air out of lines and fill the hot water tank. then fill fresh tank. This gets me 6+ additional gallons of water on board rather than filling the heater from the fresh tank.