| 9 | 171 414 / 308 365 | Sightglass assembly kit | | |
| 12a | 171 012 | Main burner | | |
| 12b | | Main burner injector | | |
| 13 | 171 424 | Injector | | |
| 14 | 171 434 / 397 943 | Pilot burner injector | | |
| 15 | 171 438 / 308 358 | Pilot burner head | | |
| 17 | 171 441 / E25-841 | Gas valve kit | | |
| 18 | 171 442 / 308 317 | Ignition electrode complete with lead and backnut 410 mm lg | | |
| 19 | 171 894 | Control box assembly, including PCB | | |
| 23 | 171 450 | Automatic ignition printed circuit board | | |
| 24 | 171 454 | Pressure switch | | |
| 26 | 171 929 / 308 283 | Thermostat knob | | |
| 30 | 171 463 / E72-557 | Fan assembly | | |
| 35 | 173 589 | Boiler casing assembly complete | | |
| 37 | 173 586 | Controls casing door complete | | |
| 39 | 171 479 | Casing seal kit | | |
| 45 | 171 950 / 386 144 | Overheat thermostat | | |
| 59 | 173 353 | Limit thermostat | | |
