Which of the listed components would be considered the dividing line separating the condensate system from the feed water system?

Correct Answer: Option C — Deaerating feed tank

The deaerating feed tank (DFT) or DC heater serves as the crucial physical and operational dividing boundary between the vacuum-operated condensate system and the pressure-side boiler feed water system, storing heated, oxygen-free water ready for the high-pressure feed pumps.