Question-and-Answer Resource for the Building Energy Modeling Community
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If I'm understanding the question correctly, you would create individual plant loops for each floor and connect all fixtures from a single floor to the respective plant loop.
You would still have a single service hot water tab, as you have pictured above; however it would contain multiple fixtures, each of which would be connected to their own plant loop (which will each contain their own boiler, heat pump, or whatever you have as your heat source. So you will have one of the loops pictured below for each floor (with however many fixtures you have per floor).
