Hot holding equipment is intended to keep hot food hot – it is not intended to heat or reheat food. Hot holding equipment such as a steam table or hot box can be tested by placing a hot food item (or even hot water) that is 135°F (57°C) or higher into the unit. The product should be checked in 30 to 60 minutes. If the product stays at 135°F (57°C) or higher, the equipment should be assumed to be working properly. If the temperature drops below 135°F (57°C) and the unit is set to the highest temperature, it needs to be repaired.