| 19 | T2008400 | Tile, Rear | | |
| 18 | T2008300 | Tile, Side, Left and Right | | |
| 17 | T2008500 | Tile, Front | | |
| 16 | 20425802 | Heat Shield | | |
| 15 | 20442100 | Bracket, Flue Collector / Heat Exchanger | | |
| 14 | 20442000 | Baffle Retainer / Refractory Cover | | |
| 13 | 20441800 | Rail, Support, Outside Right Panel | | |
| 12 | 20441700 | Rail, Support, Right | | |
| 11 | 20441600 | Rail, Support, Left | | |
| 10 | 20441402 | Top, Front Section | | |
| 9 | 20441200 | Side Panel, Right Top Section | | |
| 8 | 20442405 | Top, Rear Section | | |
| 7 | 20442404 | Side Panel, Right Bottom Section | | |
| 6 | 20442403 | Side Panel, Water Heater | | |
| 5 | 20442402 | Panel, Rear | | |
| 4 | 20442401 | Front Panel | | |
| 3 | 20420100 | Support, Front and Rear Tile | | |
| 2 | 20440500 | Heat Exchanger Support | | |
| 1 | 20440202 | Base | | |
| 7 | E2078000 | Temperature Controller (Aquastat) | | |
| 6 | E2074506 | Fan Proving Switch (5000-10000 Ft, Nat, LP) | | |
| 6 | E2074503 | Fan Proving Switch (0-5000 Ft, Nat, LP) | | |
| 5 | 20430400 | Flame Rollout Safety Switch | | |
| 4 | E2074400 | Transformer 115/24V (50VA) | | |
| 3 | E0015900 | High Limit Temperature Switch | | |
| 2 | E2078500 | Time Delay Relay | | |
| 1 | E2104300 | Toggle Switch | | |
| 9 | A0095600 | Bell & Gossett Pump | | |
| 8 | 20440007 | Piping Assembly (Applicable to B&G Pump) | | |
| 7 | A2002500 | Taco Pump | | |
| 6 | 20440006 | Piping Assembly (Appliable to Taco Pump) | | |
| 5 | 20440005 | Piping Assembly | | |
| 4 | 20440004 | Piping Assembly | | |
| 3 | 20440003 | Piping Assembly | | |
| 2 | 20440002 | Piping Assembly | | |
| 1 | 20440001 | Piping Assembly | | |
| 17 | P2032500 | Drain Boiler Brz 1/2" NPT | | |
| 16 | A2003300 | Temp / Press Relief Valve | | |
| 15 | S2006700 | | | |
| 14 | A2003200 | Anode, Water Tank | | |
| 13 | A2086100 | Tank, 80 Gallon | | |
| 12 | A2078600 | Handle, Access | | |
| 11 | H2022400 | Logo, Mighty Stack | | |
| 10 | 20443700 | Door Panel | | |
| 9 | 20443800 | Bracket, Outer Mounting | | |
| 8 | 20443900 | Bracket, Mounting | | |
| 7 | 20444000 | Plate, Anode Cover | | |
| 6 | 20444100 | Panel, Access | | |
| 5 | 20444300 | Tank Top Panel | | |
| 4 | 20444500 | Rear Panel | | |
| 3 | 20444800 | Right Side Panel | | |
| 2 | 20445000 | Left Side Panel | | |
| 1 | 20445300 | Tank Base Panel | | |
| 7 | L0032700 | 8001-10000 FT - Gas Orifice, Propane | | |
| 7 | L0050400 | 8001-10000 FT - Gas Orifice, Natural | | |
| 7 | L0050300 | 5001-8000 FT - Gas Orifice, Natural | | |
| 7 | L0032800 | 5001-8000 FT - Gas Orifice, Propane | | |
| 7 | L0032600 | 2001-5000 FT - Gas Orifice, Natural | | |
| 7 | L0032900 | 0-5000 FT - Gas Orifice, Propane | | |
| 7 | L0032600 | 0-2000 FT - Gas Orifice, Natural | | |
| 6 | V2002300 | Main Gas Valve - Propane | | |
| 6 | V2001900 | Main Gas Valve - Natural Gas | | |
| 5 | V2001900 | Pilot Assembly - Propane | | |
| 5 | 20401201 | Pilot Assembly - Natural Gas | | |
| 4 | L2010002 | Gas Manifold | | |
| 3 | L0052500 | Main Burner | | |
| 2 | 20421102 | Burner Tray | | |
| 1 | 20421202 | Burner Cover | | |
| 4 | 20425402 | Outlet Flue Collar | | |
| 3 | A2000200 | Induced Draft Blower | | |
| 2 | 20404608 | NAT. 5001-10000 FT. Blower Orifice Plate & | | |
| | LP 5001-10000 FT. Blower Orifice Plate | | |
| 2 | 20404612 | LP 0-5000 FT. Blower Orifice Plate | | |
| 2 | 20404607 | NAT. 0-5000 FT. Blower Orifice Plate | | |
| 1 | 20430602 | Flue Collector Assembly | | |
| 6 | P0027000 | Pipe Plug, Brass, 3/4 NPT | | |
| 5 | P2023100 | Nipple, Brass 1/2 NPT | | |
| 4 | P2022900 | Coupling, Bronze Pipe, 1/2 NPT | | |
| 3 | E0025900 | Well, Immersion | | |
| 2 | 20423402 | Baffle | | |
| 1 | 20423202 | Heat Exchanger | | |
