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Pictures of the system. 80 gallon tank visible on L. Synergy in the middle. Large storage tank for in floor heat on the R...

Thanks for the detailed response! I still don't have the clearance to post links to pictures but will show you my system whenever HVAC-talk lets me.

Bottom line is that your assumption is...

You're correct that the smaller tank with the heating element feeds the water out to the house and the bigger tank with hot water provided by the heat pump sends water over to that smaller tank.
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Thank you for the response. My model numbers are:
Envision - NSW025C10HLSS0SA
Synergy3D - SDV049E101NTL0SA

As it turns out I seem to be unable to post pics/links since I have not had enough...

We built a home last spring with an open loop system using Waterfurnace components. In the basement I have a 5 ton Synergy 3D unit and an Envision unit. This provides radiant heat to the basement...