| 120 | 238162 / 114-852 | Sight glass mica | | |
| 121 | 238106 / 114-872 | Mica retainer outer | | |
| 200 | 5112321 | Fan and gasket kit | | |
| 202 | 5112326 | Venturi assembly | | |
| 206a | 5113375 | Heat exchanger - 3 way - primary | | |
| 206b | 5113376 | Heat exchanger - 4 way - primary | | |
| 207 | 5113044 | Temperature sensor | | |
| 209 | 238162 / 114-852 | Sight glass mica | | |
| 216 | 238246 / 114-856 | Burner sub-assembly | | |
| 217 | 407776 / E78-614 | Electrode | | |
| 219 | 5111451 | Condensate trap assembly | | |
| 305 | 5110550 | PCB assembly | | |
| 306 | 230981 / 364-866 | Temperature control knob | | |
| 308 | 5111922 | Igniter assembly | | |
| 313 | 5110393 | Air pressure switch | | |
| 318 | 5113517 | Heat exchanger - secondary | | |
| 322 | 5112334 | Gas valve kit | | |
| 329 | 411026 / 173-138 | Burner injector 24 HE 4.1 mm dia | | |
| 330 | 5112209 | Washer - Injector | | |
| 331 | 5113044 | Temperature sensor | | |
| 332 | 404517 / 173-130 | Overheat thermostat | | |
