What is a Rethermalizer?
Retherming is reheating previously cooked food to a safe temperature. According to the USDA, prepared food must be reheated to an internal temperature of 165°F, within two hours, or it must be discarded. Cooking times of 90 minutes are preferred, to allow a safe amount of flexible preparation and cooking time.
Ovens that are designed specifically for retherming are called thermalizers but are also known as retherm ovens or rethermalizers.