Bain Marie Heater is a piece of equipment used in science, industry, and cooking to heat materials gently or to keep materials warm over a period of time.A bain-marie is often used for cooking custards and other delicate foods that are liable to crack with dry heat. Some chefs use the bain-marie method for cooking cheesecakes as they may crack in the centre when cooked by dry heat.Bain maries are a must-have for any buffet setup. They allow you to keep a variety of hot dishes warm and ready to serve for extended periods of time. They also help maintain the quality and consistency of the food, ensuring that it is still fresh and delicious when guests come back for seconds.What temperature should a bain-marie be? The ideal temperature for a bain-marie or a double boiler is between 60 and 70 degrees celsius and should never reach boiling point. To prevent bacteria from growing on the prepared food, keep a Bain Marie at 63 degrees celsius.