The TCW 3000 AC exists as icelined vaccine refrigerator. It works at a preset setpoint of 5°C that can not be changed by the user. The same model is available as a vaccine freezer. This model works at a preset setpoint of -20°C that can not be changed by the user. The 2 models are exactly the same, except that the freezer includes no icelining. By changing the setpoint and removing the waterpacks, you can change the refrigerator into a freezer. For the DC version its the same, except that the freezer model works at a setpoint of -12°C and it's only usable for waterpack-freezing, not for vaccine.