The storage type cooler has the evaporator coil soldered on to the walls of the storage tank of the cooler, generally on to the outside surface of the walls. The tank could be of the galvanized steel or stainless steel sheets. Water level is maintained in the tank by a float wall.
Push type water taps are generally provided for drawing cold water in both the types, to minimize the wastage of refrigerated water. Thermostat controls the operation of the compressor to maintain the water temperature at the desired level. The feeler bulb of the thermostat is clamped on to the water coil just at its outlet end in the instantaneous cooler. In the storage type, the bulb is kept immeresed in water in the tank or clamped to the wall of the storage tank on the outside at a lower level, much below the lower most evaporator refrigerant tube soildered on to the tank.