| 1 | 2400-284 | Combustion Coil (Primary H-X) CB | | |
| 2 | 10-078 | Economizer Coil (Secondary H-X) | | |
| 3 | 10-034 | Upper Head | | |
| 4 | 10-112 | Inner Shroud | | |
| 5 | 10-124 | Outer Shroud | | |
| 6 | 2400-286 | Ignitor (w/Gasket) after s/n 391-126 791-044 | | |
| 6 | 2400-248 | Ignitor, before s/n 391-127 791-045 | | |
| 7 | 2400-082 | Burner (Flameholder) (w/Gaskets) | | |
| 2400-308 | Burner (w/Gaskets) (250 Series) | | |
| 8 | 10-048 | Upper Insulation (Blanket) | | |
| 9 | 10-050 | Upper Insulation (Board) | | |
| 10 | 10-106 | Lower Insulation (Board) | | |
| 11 | 10-108 | Lower Insualtion (Blanket) | | |
| 12 | 10-332 | Gasket, Igniter (1 req'd) | | |
| 13 | 10-338 | Gasket, Burner (2 req'd) | | |
| 14 | 1-254 | Gasket, Blower Inlet (1 req'd) | | |
| 15 | 10-324 | Gasket, Blower Discharge (1 req'd) | | |
| 11-066 | Gasket, Blower Discharge (250 series) | | |
| 16 | 2400-079 | Blower Assembly (w/Gaskets) | | |
| 2400-310 | Blower Assembly (w/Gaskets) (250) | | |
| 17 | | Orifice, Air | | |
| 18 | | Orifice, Gas | | |
| 19 | 1-252 | Orifice Union | | |
| 20 | 10-252 | Mixer Tube | | |
| 11-016 | Mixer Tube (250 Series) | | |
| 21 | 1-458 | Air Duct Hose | | |
| 11-038 | Air Duct Hose (250 Series) | | |
| 22 | 2400-026 | Gas Valve Balance Line | | |
| 23 | 10-402 | Jacket, Front Removeable | | |
| 24 | 10-406* | Jacket, Top | | |
| 25 | 10-010 | Jacket, Bottom | | |
| 26 | 2400-224 | Control, Boiler Integrated | | |
| 27 | 2400-006 | Transformer, 40 VA | | |
| 28 | 2400-062 | Time Delay Relay | | |
| 29 | 10-354 | Wiring Harness | | |
| 30 | 2400-110 | Stack Switch | | |
| 31 | 2400-056 | Operating Control | | |
| 32 | 2400-055 | Safety Limit | | |
| 33 | 2400-058 | Intake T.C.O. | | |
| 34 | 2400-058 | Exhaust T.C.O. | | |
| 35 | 2400-020 | T.C.O. | | |
| 36 | 2400-014 | Gas Valve | | |
| 37 | 2400-015 | Gas Valve (250 Series) | | |
| 38 | 2400-088 | Capacitor (Blower Start/Run) | | |
| 2400-386 | Pump, Grundfos UP 26-99-BF | | |
| 39 | 2400-094 | Valve, Pressure Relief (150 PSI) | | |
| 2400-095 | Valve, Pressure Relief (250 Series) | | |
| 40 | 2400-096 | Valve, Pressure Relief (125 PSI) | | |
| 2400-097 | Valve, Pressure Relief (250 Series) | | |
| 41 | 2400-001 | Diverting Valve (Complete) | | |
| 2400-129 | | | |
| 2400-130 | | | |
| 42 | 2400-102 | Terminal, Intake | | |
| 43 | 2400-104 | Terminal, Exhaust | | |
| 44 | 2400-100 | Flange, Wall, Vent Pipe | | |
| 45 | 2400-390 | Exhaust Assembly | | |
| 46 | 2400-402 | Exhaust Assembly (250 Series) | | |
