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After trying to implement the above, I realized I had misinterpreted the diagram in the IO Reference. The Storage Tank for the Solar Thermal panels is supposed to be put into the other plant loops. Unfortunately, this means a bunch of heat transfer tanks to get preheated water from the Storage Tank to the Boiler loop and WaterHeater loop since the Storage Tank only has 2 pairs of water input output nodes. (see picture)

image description

If this configuration works, then I'll accept this answer. If not, still looking for suggestions on a more practical way to get preheated water from the Storage Tank to the Boiler and WaterHeater loops while being able to control when heat is transferred.