Final answer:
The water in a high-temperature dishwashing machine must reach at least 74°C or 165°F for heat sanitation.
Step-by-step explanation:
The water in a high-temperature dishwashing machine must reach at least 74°C or 165°F for heat sanitation. This high temperature is necessary to kill bacteria and other microbes that may be present on the dishes. Heating the water to this temperature helps ensure that the dishes are properly sanitized.