The Vitosolic controller prioritization of where it directs heat is functioning a little differently than I anticipated. Each "cylinder" (storage tank) is given a priority and has a set "max temp". I thought that the controller would direct heat entirely to the highest priority tank until it reached the "max temp", then it would begin directing heat to the next priority tank.
Instead, it directs heat to whichever tank is 5 degrees below the collector (remembering the that collector is normally rising in temp while the tanks stay relatively static in temps during solar collection period). This actually works just fine, but it means that the higher priority tank may not reach full temp as fast. Still, under this type of control, there is definitely no opportunity wasted to collect and store solar energy.
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