| 9 | 171 414 / E83-619 | Sightglass assembly kit |
| 12 | 171 416 / E85-891 | Main burner |
| 13 | 171 426 / E83-625 | Main burner injector |
| 14 | 171 434 / E83-627 | Pilot burner injector |
| 15 | 171 438 / E83-630 | Pilot burner head with injector |
| 17 | 171 441 / E83-633 | Gas valve kit |
| 18.1 | 171 973 / E85-893 | Detection electrode |
| 19 | 171 928 / E85-894 | Control box assembly & PCB |
| 23 | 173 799 / H20-882 | PCB25E |
| 25 | 171 970 / E85-895 | Boiler thermostat |
| 26 | 171 929 / E85-896 | Thermostat knob |
| 35 | 173 591 / H09-108 | Boiler casing assembly complete |
| 37 | 173 592 / H09-109 | Controls casing door complete |
| 39 | 079 594 | Casing sealing kit |
| 45 | 171 950 / E83-682 | Overheat thermostat |
