| 1 | 20157804 | Base Assembly | | |
| 2 | 20157904 | Burner and Burner Plenum Weldment | | |
| 3 | 20158604 | Venturi Assembly | | |
| 4 | 20159104 | Combustion Chamber Weldment | | |
| 5 | | Gas Train Assembly | | |
| 20260100 | (U.S.) | | |
| 20260101 | (Canada) | | |
| V2003700 | Gas Valve | | |
| V2003800 | Pressure Regulator | | |
| P2017700 | Orifice Holder | | |
| 6 | A2088100 | Motor, Blower | | |
| 7 | | Electrical Controls | | |
| E0015900 | High limit Control | | |
| E0109200 | Toggle Switch | | |
| E0071300 | Indicator Light | | |
| E0099403 | Fusible Link | | |
| E0086100 | Transformer | | |
| E2000300 | Fuse Holder | | |
| E2043600 | Fuse, 2 Amp | | |
| E0013000 | Flow Switch | | |
| E2076100 | Burner Temperature Switch | | |
| E2075100 | Low Water Cutoff | | |
| E2077700 | Pump Time Delay | | |
| 8 | F0044800 | Sight Glass | | |
| 9 | W0038001 | Igniter, Hot Surface | | |
| 10 | 20409800 | Gasket, Igniter Hot Surface | | |
| 11 | E2101300 | Control, Remote Ignition | | |
| 12 | E2101400 | Control, Temperature | | |
| 13 | E2101600 | Display, Temperature | | |
| 14 | 20256004 | Heat Exchanger Assy., 2 pass, Copper Tubes | | |
| 20104604 | Heat Exchanger Assy., 2 pass, Cupronickel tubes | | |
| 16 | 20150200 | Cover, Machined In/Out | | |
| 17 | 20150306 | Plate, Mach. Adapter | | |
| 18 | 20255401 | Flange, Machined | | |
| 19 | 20150100 | Cover, Machined Rear | | |
| 21 | 20155404 | Flue Collector Assembly (with gaskets) | | |
| 22 | 20255204 | Jacket Assembly (Not Shown) | | |
| 23 | 20256500 | Covering Plate (side) | | |
| 24 | 20258300 | Collar, Jacket | | |
| 25 | 20156804 | Bonnet | | |
| 26 | 20157504 | Panel Top, | | |
| 27 | 20152800 | Panel, Top Side, Left | | |
| 28 | 20152700 | Panel, Side, Left | | |
| 29 | 20152900 | Panel, Bottom Side, Left | | |
| 30 | 20157404 | Panel, Access | | |
| 31 | 20157204 | Panel, Back | | |
| 32 | 20256203 | Plate, Blank (back) | | |
| 33 | 20157100 | Panel, Side, Right | | |
| 34 | 20157000 | Panel, Top Side, Right | | |
| 35 | 20156900 | Panel, Bottom Side, Right | | |
| 36 | E2103000 | Blocked Vent Safety Switch | | |
| 37 | 20262702 | Cover Plate For Gas Conn | | |
| 38 | 20255104 | Tile Assembly | | |
| 39 | 20254703 | Outdoor Terminal Kit | | |
| 40 | D2004700 | Side Wall Vent Terminal (When Used) (Not Shown) | | |
| 41 | 20260704 | Sidewall Comb. Air Terminal (When Used) (Not Shown) | | |
| A2088700 | Filter | | |
| S2006100 | Filter Gasket | | |
| S2006200 | Filter Housing Gasket, Top | | |
| S2006300 | Filter Housing Gasket, Side | | |
