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Directory: Catalog > Water
Heaters > A.O. Smith > Parts
Parts List: A.O. Smith GB-2500, GW-2500; Series 400 / 405
- Use the chart to find the part you need to order. A diagram of the unit is below the chart to assist you in locating your part.
- Click on the underlined link to go directly to the part's page for pricing and ordering.
- For parts that are not underlined and do not have a link, please Contact Us for price and availability.
- The manufacturer has changed some part numbers to a new part number, and we have referenced the new part number in the chart (if applicable). Please note that the manufacturer may change part numbers and availability at any time.
- You can download and print the original PDF of the A.O. Smith parts list at the bottom of the page.
Combustion Chamber Assembly Components:
| Item |
Description |
GB/GW-2500
Series 400/405 |
| 1 |
Base/Leg Assembly |
210702-5 |
| 2 |
Blower Assembly, Large |
211096 (new # 9005332205) (qty. 3) |
| 3 |
Blower Assembly, Small |
----- |
| 4 |
Bracket, Gas Manifold |
210780 (new # 9005843205) (qty. 7) |
| 5 |
Burner, 60mm |
210757 (new # 9005895205) (qty. 22) |
| 6 |
Burner Assembly |
211306 (new # 9005847205) (qty. 3) |
| 7* |
Clamp, Hose |
211360 (qty. 3) |
| 8 |
Control Panel |
210740-5 (new # 210740-005) |
| 9 |
Flame Sensor |
192682 (new # 9004520215) (qty. 4) |
| 10 |
Flubox Assembly |
211290-3 |
| 11 |
Gas Train, 3 Burner - Natural Gas |
211082 (qty. 4) |
| 12 |
Gas Train, 3 Burner - Propane |
211082-1 (qty. 4) |
| 13 |
Gas Train, 4 & 5 Burner - Natural Gas |
211081 (new # 9005331205) (qty. 3) |
| 14 |
Gas Train, 4 & 5 Burner - Propane |
211081-1 (qty. 3) |
| 15 |
Gasket, Blower |
210775 (qty. 3) |
| 16 |
Gasket, Blower |
----- |
| 17 |
Gasket, Burner |
210774 (new part # 9005914215) |
| 18 |
Gasket, Divider Insert |
----- |
| 19 |
Gasket, Heat Exchanger (qty. 2) |
210779 (new # 210779-000) |
| 20 |
Gasket, Ignitor |
210078 (new # 9005933215)
(qty. 2) |
| 21 |
Gasket, Observation Port (qty. 2) |
211297 (new # 211297-000) |
| 22 |
Heat Exchanger Assembly (GB models) |
21731-5 |
| 22A |
Heat Exchanger Assembly Brass (GB models) |
211494-5 |
| 23 |
Heat Exchanger Assembly (GW models) |
210750-5 (new # 9005248205) |
| 23A |
Heat Exchanger Assembly (GW models) |
211582-5 (new # 9005248205) |
| 24 |
Igniter |
192334 (new # 9006101205) (qty. 2) |
| 25 |
Insulation Assembly: |
|
| 25A |
Insulation, Bottom Mate |
210724-4 |
| 25B |
Insulation, Bottom Panel |
210723 (new # 210723-000) |
| 25C |
Insulation, Front Mate |
210722-4 (no longer available) |
| 25D |
Insulation, Front Panel |
210794 (no longer available) |
| 25E |
Insulation, Rear Mate |
210726-4 |
| 25F |
Insulation, Rear Panel |
210725 (no longer available) |
| 25G |
Insulation, Side Panel |
210727 (no longer available) |
| 25H |
Insulation, Side Panel |
210727-1 (no longer available) |
| 25I |
Insulation, Side Panel |
210728-11 |
| 25J |
Insulation, Side Panel |
210728-8 |
| 25K |
Insulation, Top Panel |
210743-3 |
| 26 |
Insulation, Fluebox Outer (qty. 2) |
211411-3 |
| 27 |
Main Gas Manifold |
210756-5 (new # 210756-005) |
| 28 |
Manifold Assembly, 3 Burner |
210755 (qty. 2) |
| 29 |
Manifold Assembly, 3 Burner |
210761 (new # 9007217005) (qty. 2) |
| 30 |
Manifold Assembly, 4 Burner |
210754 (qty. 2) |
| 31 |
Mainfold Assembly, 5 Burner |
210763 |
| 32 |
Nut, Hex Serrated Flange |
210226 (qty. 12) |
| 33 |
Nut, Locking |
21074 (new part # 9000569005) (qty. 9) |
| 34 |
Observation Port Assembly (qty. 2) |
98760 (new # 9005356215) |
| 35 |
Orifice - Natural Gas |
210758-111 (new # 210758-111) (qty. 25) |
| 36 |
Orifice - Propane |
210758-75 (new # 210758-075) (qty. 25) |
| 37 |
Panel, Air Box Divider |
210720 (qty. 2) |
| 38 |
Panel, Air Box Divider with Slot |
----- |
| 39 |
Panel, Air Diverter |
211080 (qty. 3) |
| 40 |
Panel, Front Combustion |
210703-5 |
| 41 |
Panel, Side Air Chamber |
211088 (new # 211088-000) |
| 42 |
Panel, Side Air Chamber |
211088-1 |
| 43 |
Panel, Top Combustion |
211135-2 |
| 44 |
Plate, Divider Insert |
----- |
| 45 |
Plate, Insert Mate |
----- |
| 46 |
Rear Combustion Assembly |
211254-5 |
| 47 |
Screw Cap |
190960 (qty. 12) |
| 48 |
Side Panel Assembly |
210716-1 |
| 49 |
Side Panel Assembly |
210716 |
| 50 |
Silicone Tube |
210209-10 (qty. 6) |
| 51 |
Silicone Tube |
210209-25 (qty. 4) |
| 52 |
Strain Relief |
210173 (new # 210173-000) (qty. 3) |
| 53 |
Strain Relief Tube Assembly |
210234 (qty. 6) |
| 54 |
Switch, Blocked Flue |
210908-2 (new # 9005681205) |
| 55 |
Switch, Differential |
211094 (new # 9004634215) (qty. 3) |
| 56 |
Switch, Differential - Propane |
211094-1 (new # 9004634215) (qty. 3) |
| 57 |
Switch, Low Gas - Natural Gas |
191149-1 (new # 9003301205) |
| 57 |
Switch, Low Gas - Propane |
191149-3 (new # 9003301205) |
NOTES:
- The manufacturer may change part numbers and availability at any time.
* Items not illustrated
- CSD-1 and IRI models substitue the following part numbers for the Gas Train Assemblies: Item 11 substitute with 211082-2; Item 12 substitute with 211082-3; Item 13 substitute with 211081-2; Item 14 substitute with 211081-3.
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Jacket Assembly Components:
| Item |
Description |
GB/GW-2500
Series 400/405 |
| 1 |
User Interface, Display |
211762 |
| 2 |
Bracket, Control Box Support |
211362 |
| 3 |
Cap, Pipe |
43762-2 |
| 4 |
Control Box |
212458 |
| 5 |
Gasket,Conduit (qty. 2) |
211266 (new # 211266-000) |
| 6 |
Gasket, Main Gas Manifold (qty. 2) |
211045-1 |
| 7 |
Gasket, Vent Adaptor (qty. 2) |
211049-4 |
| 8 |
Gasket, Vent Adaptor (Air Inlet) |
211049-3 |
| 9 |
Handle, Front Panel |
191802 (new # 191802-000) (qty. 2) |
| 10 |
J-Box Cover (qty. 2) |
2233 (new # 002233-000) |
| 11 |
Junction Box (qty. 2) |
190438-4 (new # 190438-004) |
| 12 |
Locknut, Star (qty. 2) |
1953 (new # 001953-000) |
| 13 |
Nipple, Chase (qty. 2) |
41994 |
| 14 |
Nut, Speed |
68463 (new # 068463-000) (qty. 7) |
| 15 |
Panel, Display Assembly |
212511-001 |
| 16 |
Panel, Front Bottom |
211252-5 |
| 17 |
Panel, Rear Jacket |
211137-2 |
| 18 |
Panel, Right Jacket Assembly |
211282-2 |
| 19 |
Panel, Side Access |
210792 |
| 20 |
Panel, Side Jacket |
210738-1 |
| 21 |
Panel, Side Jacket |
210737-1 |
| 22 |
Panel, Side Jacket Insert (qty. 2) |
211074 |
| 23 |
Panel, Top Jacket |
210733-5 (new # 210733-005) |
| 24 |
Panel, Mid-Jacket Assembly |
211072-1 |
| 25 |
Plate, Conduit |
211265 |
| 26 |
Plate, Conduit - 2 Holes |
211265-1 |
| 27 |
Plate, Flue |
211047-3 |
| 28 |
Plate, Main Gas Manifold (qty. 2) |
211046-1 |
| 29 |
Plate, Top Jacket |
211142 (new # 9005236205) |
| 30 |
Screw, Panel |
68462 (new # 068462-000) (qty. 7) |
| 31 |
Screw, Sheet Metal |
210125-1 (new # 210125-001) (qty. 56) |
| 32 |
Switch, Rocker |
212839 |
| 33 |
Valve, Ball 2 x 2 |
----- |
| 34 |
Valve, Ball 2-1/2 x 2-1/2 |
69022-3 |
| 35 |
Vent Adaptor - Exhaust |
210783-4 |
| 36 |
Vent Adaptor - Air Inlet |
210783-2 |
| 37 |
Washer, Locknut (qty. 4) |
210207 (new # 210207-000) |
| 38 |
Washer, Retaining (SPL) |
68338 (new # 068338-000) (qty. 7) |
NOTES:
- The manufacturer may change part numbers and availability at any time. |
Water Heater Connections:
| Item |
Description |
GB-2500 |
GW-2500 |
| 1 |
Flow Switch Conduit Assembly |
211156 (new # 211156-000) |
211156 (new # 211156-000) |
| 2 |
Inlet Temp. Conduit Assembly |
210180-1 (new # 210180-001) |
210180-1 (new # 210180-001) |
| 3 |
Low Water Cutoff |
210376 (new # 210376-000) |
210376 (new # 210376-000) |
| 4 |
Low Water Cutoff Conduit Assembly |
211118 (new # 211118-000) |
211118 (new # 211118-000) |
| 5 |
Outlet Conduit Assembly |
210181-1 (new # 210181-001) |
210181-1 (new # 210181-001) |
| 6 |
Pump - 1/2 HP Volute |
----- |
----- |
| 7 |
Pump - 1 HP Volute |
----- |
211251 (new # 211251-000) |
| 8 |
Relief Valve - 125 PSI |
----- |
98883-7 (new # 9005352205) |
| 9 |
Relief Valve - 50 PSI |
210451-3 (new # 210451-003) |
----- |
| 10 |
Switch - Flow |
210176 |
210176 |
| 11* |
Tank Probe |
----- |
210211-1 (new # 9004615215) |
NOTES:
- The manufacturer may change part numbers and availability at any time.
* Item not illustrated.
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Control Box Assembly:
| Item |
Description |
GB/GW--2500 |
GB/GW-2500 IRI |
| 1 |
Control Box Base |
212459-000 |
212459-002 |
| 2 |
Control Box Panel |
212457-000 |
212457-000 |
| 3 |
Central Control Board (CCB) |
211758 |
211758 |
| 4 |
Flame Control Board (FCB) |
211759 (new part # 9006521005) (qty. 3) |
211759 (new part # 9006521005) (qty. 3) |
| 5 |
Relay, 120-Volt |
211546 (new part # 9006612005) |
211546 (new part # 9006612005) (qty. 2) |
| 6 |
Control Box Top |
211109 |
211109 |
| 7 |
Support Bracket |
212455 |
212455 |
| 8 |
Control Box Front Panel |
212461 |
212461 |
| 9 |
Power Distribution Board (PDB) |
211760-000 (new # 9007310005) |
211760-000 (new # 9007310005) |
| 10 |
Transformer, 150 VA |
----- |
----- |
| 11 |
Transformer, 250 VA |
211673 (new part # 9007353005) |
211673 (new part # 9007353005) |
NOTES:
- The manufacturer may change part numbers and availability at any time. |
Wire Harness:
| Item |
Description |
GB/GW-2500
Series 400/405 |
| 1 |
Harness, Power Line Input |
212447 |
| 2 |
Harness, 120 VAC Power Distribution |
212410-001 |
| 3 |
Harness, 24 VAC Power Distribution |
212409-001 |
| 4 |
Harness, Transformer |
212411-001 |
| 5 |
Harness, Relay Coil |
211949-002 |
| 6 |
Harness, Gas Valve Realy Power (not shown) |
211952-000 |
| 7 |
Harness, Gas Valve Relay Power |
211951-001 (qty. 2) |
| 8 |
Harness, Communication |
211953-000 (qty. 2) |
| 9 |
Harness, Communication (qty. 2) |
211953-001 |
| 10 |
Harness, Inlet Probe |
211954-000 |
| 11 |
Harness, Outlet ECO |
211955-000 |
| 12 |
Harness, External Thermostat |
211956-002 |
| 13 |
Harness, 120 VAC Stage Output |
212692-000 (qty. 2) |
| 14 |
Harness, 120 VAC Stage Output (qty. 2) |
212692-001 |
| 15 |
Harness, Chasis Grounding (not shown) |
211204-407 (qty. 4) |
| 16 |
Harness, Transformer Jumper (not shown) |
211204-415 |
| 17 |
Harness, Pump Realy Contacts |
211963-000 |
| 18 |
Harness, 24 VAC Output Stages (qty. 3) |
212413-000 |
| 19 |
Harness, 24 VAC Output Stages |
212413-001 |
| 20 |
Harness, Tank Probe |
211989-000 |
| 21 |
Harness, Pump |
211945-003 |
| 22 |
Harness, Switch Input |
211950-003 |
| 23 |
Harness, 24 VAC Output |
211951-001 |
NOTES:
- The manufacturer may change part numbers and availability at any time. |
4 Stage Control Shelf Wiring Harnesses:
| Item |
Description |
GB-2500 |
GW-2500 |
| 1 |
120VAC Termination Assembly |
----- |
----- |
| 2 |
120VAC Termination Assembly |
----- |
----- |
| 3 |
120VAC Termination Assembly |
211386 |
211101 |
| 4 |
120VAC Termination Assembly |
211101 |
211101 |
| 5 |
24VAC Termination Assembly |
----- |
----- |
| 6 |
24VAC Termination Assembly |
----- |
----- |
| 7 |
24VAC Termination Assembly |
211388 |
211388 |
| 8 |
24VAC Termination Assembly |
211100 |
211100 |
| 9 |
GW Pump Harness Assembly |
----- |
211393-5 |
NOTES:
- The manufacturer may change part numbers and availability at any time. |
IRI/CSD-1 Components:
| Item |
Description |
GB/GW-2500
Series 400/405 |
| 1 |
Alarm Bell |
211472 (new # 211472-000) |
| 2 |
Bracket |
211504 |
| 3 |
High Pressure Switch - Natural Gas |
192527-1 (new # 9004513215) (qty. 7) |
| 3 |
High Pressure Switch - Propane |
192527 (new # 9004512215) (qty. 7) |
| 4 |
Main Manual Shut-Off |
69022-3 |
| 5 |
Pilot Shut-Off Valve |
200683 (new # 200683-000) |
| 6 |
Safety Shut-Off Valve (qty. 2) |
211503 211503-000 |
| 7 |
Vent, Valve |
210698-2 |
NOTES:
- The manufacturer may change part numbers and availability at any time.
- CSD-1 and IRI models substitute the following part numbers for the Gas Train Assemblies: Item 11 substitute with 211082-2; Item 12 substitute with 211082-3; Item 13 substitute with 211081-2; Item 14 substitute with 211081-3.
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