It's somewhat clear now. I'll bet the HW holding tank temperature sensor can issue a call for a burn,
somehow.. Even if indirectly. If you use a bunch of HW, the holding tank-zone is going to end up costing you fuel.
If you could put some PV BTUs into the holding tank?? Stop it from issuing a call?
If it's a small tank, maybe it wouldn't need many watts to keep it warmed up..
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