| 1 | 2400-038 | Top dome for combustion chamber | | |
| 2 | 1-428 | Insulation retainer | | |
| 3 | | Insulation for combustion chamber coil | | |
| 4 | | Combustion chamber coil | | |
| 5 | | Gasket, flameholder (burner / blower) | | |
| 6 | 2400-040 | Flameholder assembly, with gaskets | | |
| 7 | 2400-026 | Gas balance line | | |
| 8 | 2400-002 | Blower assembly, with gaskets | | |
| 10 | 2400-046 | Ignitor, with gaskets | | |
| 11 | | Gasket, ignitor | | |
| 12 | | Gasket, blower intake | | |
| 13 | 1-236 | Blower intake duct assembly | | |
| 14 | 1-458 | Air duct hose | | |
| 15 | | Orifice, air | | |
| 16 | 1-252 | Orifice union | | |
| 17 | | Orifice, gas | | |
| 18 | 2400-224 | Boiler control | | |
| 19 | 2400-014 | Gas valve, neg.pressure , White Rodgers | | |
| 20 | 2400-024 | Safety Limit, 215? F | | |
| 21 | 2400-226 | Low limit Aqustat | | |
| 22 | 2400-056 | Operation control | | |
| 23 | 2400-010 | Relay (HW-M2 series only) | | |
| 24 | 2400-110 | Stack Switch | | |
| 25 | 2400-006 | Transformer, 40VA, 120/24 VAC | | |
| 26 | 2400-106 | Pressure switch | | |
| 27 | 1-506 | Switch, 120 volt | | |
| 28 | 1-314 | Harness, wiring HW-M2 series | | |
| 5-060 | Harness, wiring HW-M2 series | | |
| 2400-320 | Gasket Kit | | |
| 29 | 2400-004 | Pump, TACO 007-F4, with gaskets | | |
| 30 | 1-126 | Gaskets, pump (2 each) | | |
| 31 | 2400-036 | DHW coil (single wall), with gasket | | |
| 32 | 2400-234 | DHW coil (double wall), with gasket | | |
| 33 | 1-036 | Gasket, DHW coil | | |
| 34 | 2400-114 | Gauge, pressure / temperature | | |
| 35 | 2400-112 | Pressure relief valve (30 PSIG) | | |
| 37 | 2400-034 | Transfer tank (less coil) | | |
| 2400-238 | Transfer tank (less coil). Stainless Steel | | |
| 38 | 2400-240 | Transfer tank & coil assem. (single wall) | | |
| 2400-242 | Transfer tank & coil assem. Stainless. | | |
| 39 | 1-164 | Fitting, boiler discharge | | |
| 40 | 1-278 | Tube, boiler discharge | | |
| 41 | 2400-256 | Jacket,front removable | | |
| 42 | 2400-258 | Jacket, lower front | | |
| 43 | 2400-260 | Jacket, top | | |
| 44 | 2400-342 | Pipe, 3" flue (AL29 4C S/S) 2' - 4' | | |
| 45 | 2400-336 | Pipe, 5" air (Stainless Steel) 2' - 4' | | |
| 46 | 2400-330 | Elbow Set, 3" & 5" (AL29 4C S/S) | | |
| 48 | 2400-276 | Vent terminal (horizontal venting only) | | |
| 49a | 2400-326 | Carton B Direct Vent (Standard) | | |
| 49b | 2400-328 | Carton B Direct Vent (Alternate) | | |
