| 1 | 2400-130 | | | |
| 2 | 2400-090** | Pump, Grundfos, UP26-99F - SMB | | |
| 3 | 2400-131 | Venturi, Gaskets included | | |
| 4 | 2400-402 | Exhaust (Flue) Assembly | | |
| 5 | 2400-133 | Blower | | |
| 6 | 2400-134 | Gas Valve | | |
| 7 | 2400-135 | Burner (Flameholder) | | |
| 8 | | Economizer Coil | | |
| 9 | | Boiler Coil | | |
| 10 | 2400-136 | | | |
| 2400-137 | Gasket Kit (Not Shown) | | |
| 11 | 2400-138 | | | |
| 12 | 2400-574** | Pressure Gauge (75 PSI) - SMB | | |
| 2400-316** | Pressure Relief Valve (50 PSI) - SMB | | |
| 2400-097** | Pressure Relief Valve (50 PSI) - SMB | | |
| 2400-139 | Appliance Control (PCB) | | |
| 2400-106 | Differential Pressure Switch | | |
| 2400-058 | | | |
| 2400-556 | Sensor, Appliance Discharge | | |
| 2400-055 | Safety Limit | | |
| 2400-104 | Exhaust (flue) Terminal | | |
| 2400-102 | Intake Terminal | | |
| 2400-100 | Wall Flange | | |
| 2400-140 | Propane Conversion Kit | | |
