| 1 | R60D3202 | Front Panel Assembly | | |
| 2 | R50D3204 | Front Panel Handle | | |
| 3 | R50D3101 | Rear Panel | | |
| 4 | R50D3002 | Left Side Panel | | |
| 5 | R50D3002 | Right Side Panel | | |
| 6 | R50D3308 | Left Top Panel | | |
| 7 | R40D3401 | Middle Left Top Panel | | |
| 8 | R50D3308 | Right Top Panel | | |
| 9 | R51D3102 | Jacket Angle Support | | |
| 10 | R50D3003 | Jacket Support,Left Stanchion | | |
| 11 | R50D3004 | Jacket Support,Right Stanchion | | |
| 12 | R50D7101 | Front Bezel | | |
| | Internal Components | | |
| 20 | R50D1100 | Base Assembly | | |
| 21 | R50D1001 | Left Rear Support Stanchion | | |
| 22 | R50D1002 | Left Front/Right Rear Support Stanchion | | |
| 23 | R40D1001 | Cantilevered Base Stanchion | | |
| 24 | R85D1005 | Brace, Front,HX Stanchion | | |
| 24A | R85D1005 | Brace, Rear,HX Stanchion | | |
| 25 | R50D1004 | Mounting Rail | | |
| 27 | R50D4020 | Condensate Trap Assy | | |
| 30 | R50D4027 | PVC Reducer | | |
| 31 | RP2056100 | Hose Barbed Adapter | | |
| 33 | R85D3005 | Air Inlet/Exhaust Bracket | | |
| | Gas Train Components | | |
| 40 | RA2113100 | Combustion Air Blower | | |
| 42 | RV2019600 | Gas Valve | | |
| 43 | RA2116700 | Gas/Air Venturi | | |
| 44 | RV2003000 | Manual Gas Valve | | |
| 44A | RV2000200 | Manual Gas Valve | | |
| 45 | RV2050100 | Gas Valve Flange Kit | | |
| 46 | RS2104900 | Gas Valve/Venturi Cork Gasket | | |
| 48 | RS2105200 | Venturi O-Ring | | |
| 49 | R50D5014 | High Gas Pressure Switch | | |
| 50 | R50D5015 | Low Gas Pressure Switch | | |
| 51 | R50D5017 | Duct/Venturi Transition | | |
| 52 | RP205200 | Gas Supply Pipe | | |
| 55 | RD0091301 | Air Inlet Flex Hose | | |
| 57 | RE2331700 | Electrical Connector w/Cable | | |
| 58 | RV2019300 | Elbow Adapter | | |
| | Heat Exchanger Components | | |
| 60 | RS2111300 | Heat Exchanger | | |
| 61 | R50D4040 | Pump Assembly | | |
| 62 | RE2076500 | Low Water Cutoff Switch | | |
| 63 | RE2320600 | Water Temp Sensor | | |
| 64 | RE2319900 | Duplex Water Temperature Sensor | | |
| 65 | RE2319800 | Duplex Stack Temperature Sensor | | |
| 66 | RA2113602 | Pressure Relief Valve, NTH | | |
| 67 | R1-592 | Air Vent | | |
| 68 | RS2108300 | Burner Door w/gaskets | | |
| 68A | R2069400 | Gaskets-only (burner door) | | |
| 69 | RS2108500 | Burner Gasket | | |
| 69A | RS2109100 | Gasket Set (burner, ignitor, sensor & door gaskets) | | |
| 70 | RT2109000 | Front Refractory Tile | | |
| 71 | R50D2021 | Rear Refractory Tile | | |
| 72 | R2069106 | Main Burner w/gasket | | |
| 73 | R2069200 | Flame Sensor w/gasket | | |
| 74 | R2069300 | Ignitor w/gasket | | |
| 74A | RW2013300 | Ignitor Gasket | | |
| 74B | m4-.7X8mm | Screw, Ignitor/Flame Sensor | | |
| 74C | RW2013400 | Flame/Sensor Gasket | | |
| 75 | RS2108801 | Air/Gas Channel (80-600) Air Adapter (750-850) | | |
| 75A | RS2109400 | Screw, Air/Gas Channel | | |
| 76 | R10-143 | Drain | | |
| 77 | R50D2020 | Sight Glass | | |
| | Electrical Components | | |
| 80 | R50D7001 | Control Panel Enclosure | | |
| 81 | RE2108700 | Transformer | | |
| 82 | R50D7002 | High Voltage Shield | | |
| 83 | R50D7003 | Top Panel Bracket | | |
| 84 | RS50D7008 | Electronic Control Module, CSD-1 | | |
| 85 | RE2322700 | Rocker Switch | | |
| 86 | RE2333500 | Control Display | | |
| RE2334000 | Control Display, CSD-1 | | |
| 87 | R50D7406 | Wire Harness | | |
| 88 | R50D7404 | Wire Harness, CSD-1 | | |
| 89 | RE2334700 | Air Pressure Switch | | |
| 90 | RE0013100 | Water Flow Switch | | |
