Unclear Rules For The Boiler

[SpongeBobby]

Does anyone know for the processing rate for the low goal and the high goal are:
1) the same - 5 fuel balls per sec.
2) independent or cumulative (Low+high processed 5 per sec or Low @ 5fps & high @ 5 fps)

Just wondering if its effective to dump into the low goal if it still will be counted as 5 fps. i.e. dump 100 balls, only count as 5?

Also, If I dump in lower goal, do I have to time it so that shots into the high goal is not impacted.

Thanks...