A water bath is a laboratory instrument used to maintain a constant temperature for extended periods during sample incubation. It is preferred over an open flame when heating flammable substances and is also used to facilitate certain chemical reactions at elevated temperatures.

This equipment is suitable for use in medical laboratories, universities, research institutions, and industries such as chemical processing, printing, dyeing, pharmaceuticals, petroleum, and electronics manufacturing. Common applications include evaporation, distillation, concentration, and constant-temperature heating.