| Model Code | Description | |
|---|---|---|
| 01 | 638.014, 638.034, 638.064, 638.068, 638.074, 638.078, 638.094, 638.098, 638.114, 638.134, 638.164, 638.174, 638.194, 638.214, 638.234, 638.244, 638.274, 638.294 | AUXILIARY HEATER |
| 02 | 638.094, 638.098, 638.134, 638.194, 638.234, 638.274, 638.294 | AUXILIARY HEATER OR HEATER BOOSTER |
| 03 | 638.094, 638.098, 638.194, 638.294 | AUXILIARY HEATER AND HEATER BOOSTER |