Just bought a 93 Dolphin and I think I've figured everything out except for the hot water system. How do I fill the hot water tank? I'm either getting all cold water in both faucets or just water out of the cold when I close the bypass valve. My hot water heater is heating up but I'm afraid perhaps I 've not filled the tank? Or perhaps I've missed the valve that I'm supposed to open in order to get hot water? I sure don't want cold showers so any help would sure be appreciated. I'll be taking my parents both in their mid 80's on our first trip soon and it would be great to have all systems working.