| 1 | 2400-449 | Pan, Combustion Chamber, Top | | |
| 2 | 2400-504 | Pan, Combustion Chamber, Bottom | | |
| 3 | 2400-506 | Insulation, Coil Cover | | |
| 4 | 2400-508 | Insulation, Boiler Coil | | |
| 5 | 2400-512 | Comb. Chamber/Coil Assy. | | |
| 6 | 2400-514 | Gasket, Burner | | |
| 7 | 2400-518 | Burner | | |
| 9 | 2400-522 | Boiler Drain | | |
| 10 | 2400-524 | Blower, Combustion Air (with gasket) | | |
| 11 | 2400-540 | Gasket, Blower | | |
| 12 | 2400-526 | Ignitor / Flame Sensor (with gasket) | | |
| 13 | 2400-528 | Gasket, Ignitor / Flame Sensor | | |
| 14 | 2400-142 | Adjustable Cover, Fan Inlet | | |
| 15 | 2400-530 | Coin Vent | | |
| 18 | 2400-550 | | | |
| 20 | 2400-445 | Sensor, Supply | | |
| 21 | 2400-446 | Sensor, Return | | |
| 22 | 2400-447 | Thermostatic Union (not shown) | | |
| 23 | 2400-388 | Pump | | |
| 24 | 2400-566 | Gaskets, Pump Flange | | |
| 25 | 2400-548 | Gas Valve | | |
| 29 | 2400-540 | Boiler Control | | |
| 30 | 2400-441 | Ignition Control | | |
| 31 | 2400-568 | Reset Switch | | |
| 32 | 2400-442 | PWM Board | | |
| 33 | 2400-448 | Transformer | | |
| 34 | R2006100 | Relay | | |
| 35 | 2400-444 | Wiring Harness (not shown) | | |
| 36 | 2400-574 | Gauge, Pressure | | |
| 37 | 2400-112 | Pressure Relief Valve | | |
| 38 | 2400-145 | Orifice Kit 0-5000' (not shown) | | |
| 39 | 2400-146 | Orifice Kit High Altitude (not shown) | | |
| 40 | R0560701 | Rectifier & gas valve on/off switch | | |
