Below is a list of Water Chillers manufacturers from St. Louis, Missouri. Water chillers are cooling systems designed to facilitate heat exchange from water to a refrigerant and from the refrigerant into the atmosphere. Like most other liquid chillers, water chillers cool through a cycle of pressurization, condensation, depressurization, and evaporation of a refrigerant. Water chillers differ from other chillers in that they are used primarily to cool water for industrial applications.