Hi On my 2000 Flair, how do I check to see if water is in the furnace tank. I opened the panel and have no clue. I assume without water, the tank would burn up. If empty, how do I fill it? How does the water get hot when I turn on the hot water spicket in the kitchen and shower? or is it automatic? It's hard to form or ask intellieget quiestions when one isn't the sharpest knife in the drawer when if comes to RV stuff. Thanks for everyone's patience. Fred from Pasco, WA.