What aspect of thermal storage units must be labeled for user awareness?

The correct answer pertains to the labeling of thermal storage units regarding their maximum and minimum allowable operating temperatures. This aspect is critical because it directly affects the safe operation of the unit. Users need to understand the temperature limits to prevent damage to the unit and to ensure it operates efficiently within safe boundaries. Exceeding these temperatures might lead to breakdowns or safety hazards, including the potential for fires or system failures.

Additionally, knowing the operational temperature limits helps users make informed decisions when using these systems in various applications. It also influences how users should implement maintenance and safety protocols for their thermal storage units. Therefore, effective labeling that clearly communicates these temperature parameters is essential for user awareness and safety.