Taylorjim, I plan to do 3/4 to a manifold with 3/4 to the hot water heater. 1/2 out to everything else.
One of the big reasons for the tankless and direct vent is to gain some room where the hot water heater is and eliminate the flue pipe running through a bedroom I built in the basement. We are going to add a half bathroom in the room that houses the heat/ac and hot water heater. I live in a old small house.
But, I do want to make sure I do everything right.
Randy
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2 original cub cadets 
1 100's
2 149's
1 73
1 2182
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