What is the wash solution temperature for a single tank, conveyor, or dual-temperature ware-washing machine?

• A. 150 degrees F
• B. 170 degrees F
• C. 160 degrees F
• D. 180 degrees F

Answer: (C)

In hot-water warewashing, the wash helps remove soils and fats, so the water must be hot enough to boost detergent effectiveness without wasting energy or stressing equipment. For common single-tank, conveyor, or dual-temperature machines, the standard wash temperature is about 160°F. This temperature is hot enough to clean well and begin sanitizing, while the final rinse is kept higher (typically around 180°F) to sanitize.

Why not the other temperatures? 150°F is often too cool for optimal detergent action and soil removal. 170°F is hotter than needed for the wash cycle and offers little additional cleaning benefit, plus it uses more energy. 180°F is generally reserved for the sanitizing rinse, not the wash, to ensure proper sanitation while keeping wash energy use reasonable.