T18skyguy,
Just a question if I may. If you keep the water heater set at 105 degrees so you can bath without adding any cold water to the mix, is the water at the sink hot enough to wash dishes with? 105* is probably hotter than I like my showers, so I'm just curious. The tankless system we have in the house is set at 122*, and I think it should be a bit hotter for dishwashing. We keep it set low at 122 so in case any of the "little kids" visiting hit the hot water at a sink, they won't scald themselves, otherwise I'd bump it up a bit. 105 seems a bit on the cool side, but I guess it depends upon what you're used to.
~Rick