GAS-FIRED COMMERCIAL
REPLACEMENT PARTS LIST
COPPER BOILERS FOR HYDRONIC
HEATING & HOT WATER SUPPLY
MODELS GB/GW: 1000, 1300,
1500, 1850, 2100, 2500
SERIES: 400 - 405
A.O. SMITH WATER PRODUCTS COMPANY
500 TENNESSEE WALTZ PARKWAY, ASHLAND CITY, TN 37015
Phone: 1-800-433-2545 • Fax: 1-800-433-2515
PRINTED IN U.S.A. 0906
PART NO. 212513-000
Item Qty. Description
GB/GW
1000
GB/GW
1300
GB/GW
1500
GB/GW
1850
GB/GW
2100
GB/GW
2500
COMBUSTION CHAMBER ASSEMBLY COMPONENTS:
1 .... 1 ... Base/Leg Assembly ............................... 210702 ............... 210702-1 ............ 210702-2 ............ 210702-3 ............ 210702-4 ............. 210702-5
2 .. ( ) .. Blower Assembly, Large ...................... 211096(1) ........... 211096(2) .......... 211096(2) ............ 211096(3) .......... 211096(3) ........... 211096(3)
3 .... 1 ... Blower Assembly, Small ........................ 211097 .................. - - - - ................... - - - - .................... - - - - ................... - - - - .................... - - - -
4 .. ( ) .. Bracket, Gas Manifold.......................... 210780(3) ........... 210780(3) .......... 210780(3) ............ 210780(4) .......... 210780(5) ........... 210780(7)
5 .. ( ) .. Burner, 60mm ....................................... 210757(8) .......... 210757(11) ........ 210757(13) .......... 210757(16) ........ 210757(18) ......... 210757(22)
6 .. ( ) .. Burner Assemby ................................... 211306(2) ........... 211306(2) .......... 211306(2) ............ 211306(3) .......... 211306(3) ........... 211306(3)
*7 .. ( ) .. Clamp, Hose ......................................... 211360(2) ........... 211360(2) .......... 211360(2) ............ 211360(3) .......... 211360(3) ........... 211360(3)
8 .... 1 ... Control Panel .......................................... 210740 ............... 210740-1 ............ 210740-2 ............ 210740-3 ............ 210740-4 ............. 210740-5
9 .. ( ) .. Flame Sensor ....................................... 192682(3) ........... 192682(3) .......... 192682(3) ............ 192682(4) .......... 192682(4) ........... 192682(4)
10 .... 1 ... Fluebox Assembly .................................. 211290 ............... 211290-1 ............ 211290-1 ............ 211290-2 ............ 211290-2 ............. 211290-3
GB/GW
11 .. ( ) .. Gas Train, 3 Burner - Nat. ................... 211082(2) ........... 211082(1) ............... - - - - .................... - - - - ............... 211082(2) ........... 211082(4)
12 .. ( ) .. Gas Train, 3 Burner - Prop. ............... 211082-1(2) ........ 211082-1(1) ............. - - - - .................... - - - - ............. 211082-1(2)......... 211082-1(4)
13 .. ( ) .. Gas Train, 4 & 5 Burner - Nat. ............. 211081(1) ........... 211081(2) .......... 211081(3) ............ 211081(4) .......... 211081(3) ........... 211081(3)
14 .. ( ) .. Gas Train, 4 & 5 Burner - Prop. ......... 211081-1(1) ........ 211081-1(2) ....... 211081-1(3) ........ 211081-1(4) ....... 211081-1(3)......... 211081-1(3)
15 .. ( ) .. Gasket, Blower ..................................... 210775(1) ........... 210775(2) .......... 210775(2) ............ 210775(3) .......... 210775(3) ........... 210775(3)
16 .... 1 ... Gasket, Blower ....................................... 210776 .................. - - - - ................... - - - - .................... - - - - ................... - - - - .................... - - - -
17 .. ( ) .. Gasket, Burner ....................................... 210744 ................ 210744 ............... 210744 ................ 210744 ............... 210744 ................ 210774
18 .... 1 ... Gasket, Divider Insert .............................. - - - - .................. 211363 ............... 211363 ................ 211363 ............... 211363 .................. - - - -
19 .... 2 ... Gasket, Heat Exchanger ........................ 210779 ................ 210779 ............... 210779 ................ 210779 ............... 210779 ................ 210779
20 .. ( ) .. Gasket, Igniter ...................................... 210078(1) ........... 210078(2) .......... 210078(2) ............ 210078(2) .......... 210078(2) ........... 210078(2)
21 .... 2 ... Gasket, Observation Port ...................... 211297 ................ 211297 ............... 211297 ................ 211297 ............... 211297 ................ 211297
22 .... 1 ... Heat Exchgr. Ass'y (GB ONLY) ............. 210731 ............... 210731-1 ............ 210731-2 ............ 210731-3 ............ 210731-4 ............. 210731-5
22A . 1 ... Heat Exchgr. Ass'y Brass(GB ONLY) ... 211494 ............... 211494-1 ............ 211494-2 ............ 211494-3 ............ 211494-4 ............. 211494-5
23 .... 1 ... Heat Exchgr. Ass'y (GW ONLY) ............ 210750 ............... 210750-1 ............ 210750-2 ............ 210750-3 ............ 210750-4 ............. 210750-5
23A . 1 ... Heat Exchgr. Ass'y Brass(GW ONLY) .. 211582 ............... 211582-1 ............ 211582-2 ............ 211582-3 ............ 211582-4 ............. 211582-5
24 .. ( ) .. Igniter .................................................... 192334(1) ........... 192334(2) .......... 192334(2) ............ 192334(2) .......... 192334(2) ........... 192334(2)
25 .... 1 ... Insulation Assembly
A .... 1 ... Insulation, Bottom Mate ........................... - - - - .................. 210724 ............. 210724-1 ............ 210724-2 ............ 210724-3 ............. 210724-4
B .... 1 ... Insulation, Bottom Panel ........................ 210746 ................ 210723 ............... 210723 ................ 210723 ............... 210723 ................ 210723
GB/GW
C .... 1 ... Insulation, Front Mate .............................. - - - - .................. 210722 ............. 210722-1 ............ 210722-2 ............ 210722-3 ............. 210722-4
D .... 1 ... Insulation, Front Panel ........................... 210744 ................ 210721 ............... 210721 ................ 210721 ............... 210795 ................ 210794
E .... 1 ... Insulation, Rear Mate ............................... - - - - .................. 210726 ............. 210726-1 ............ 210726-2 ............ 210726-3 ............. 210726-4
F .... 1 ... Insulation, Rear Panel ............................ 210745 ................ 210725 ............... 210725 ................ 210725 ............... 210725 ................ 210725
G .... 1 ... Insulation, Side Panel ............................ 210727 ................ 210727 ............... 210727 ................ 210727 ............... 210727 ................ 210727
H .... 1 ... Insulation, Side Panel .......................... 210727-1 ............. 210727-1 ............ 210727-1 ............ 210727-1 ............ 210727-1 ............. 210727-1
I .... 1 ... Insulation, Side Panel .......................... 210728-6 ............. 210728-6 ............ 210728-7 ............ 210728-9 ...........210728-10 ........... 210728-11
J .... 1 ... Insulation, Side Panel ......................... 210728-12 ............ 210728-1 ............ 210728-5 ............ 210728-2 ............ 210728-4 ............. 210728-8
K .... 1 ... Insulation, Top Panel ............................. 210743 ............... 210743-1 ............ 210743-1 ............ 210743-2 ............ 210743-2 ............. 210743-3
26 .... 2 ... Insulation, Fluebox Outer ....................... 211411 ............... 211411-1 ............ 211411-1 ............ 211411-2 ............ 211411-2 ............. 211411-3
27 .... 1 ... Main Gas Manifold ................................. 210756 ............... 210756-1 ............ 210756-2 ............ 210756-3 ............ 210756-4 ............. 210756-5
28 .. ( ) .. Man. Assembly, 3 Burner .................... 210755(1) ............... - - - - ................... - - - - .................... - - - - ............... 210755(2) ........... 210755(2)
29 .. ( ) .. Man. Assembly, 3 Burner ...................... 210761 ................ 210761 ................. - - - - .................... - - - - ................... - - - - ............... 210761(2)
30 .. ( ) .. Man. Assembly, 4 Burner .................... 210754(1) ............... - - - - ................... - - - - ................ 210754(1) .............. - - - - ............... 210754(2)
31 .. ( ) .. Man. Assembly, 5 Burner ........................ - - - - ................ 210763(2) .......... 210763(3) ............ 210763(3) .......... 210763(3) ........... 210763(1)
32 .. ( ) .. Nut, Hex Serrated Flange .................... 210226(8) ........... 210226(8) .......... 210226(8) ........... 210226(12) ........ 210226(12) ......... 210226(12)
33 .. ( ) .. Nut, Locking.......................................... 210174(6) ........... 210174(6) .......... 210174(6) ............ 210174(9) .......... 210174(9) ........... 210174(9)
34 .... 2 ... Observation Port Assembly .................... 98760 .................. 98760 ................. 98760 .................. 98760 ................. 98760................... 98760
35 .. ( ) .. Orifice-Natural .................................. 210758-111(10) ..... 210758-111(13) ... 210758-111(15) ..... 210758-111(19) ... 210758-111(21) ..... 210758-111(25)
GB/GW
36 .. ( ) .. Orifice-Propane ................................. 210758-75(10) ....... 210758-75(13) ..... 210758-75(15) ....... 210758-75(19) ..... 210758-75(21) ....... 210758-75(25)
37 .. ( ) .. Panel, Air Box Divider .......................... 210720(1) ............... - - - - ................... - - - - ................ 210720(1) .......... 210720(1) ........... 210720(2)
38 .... 1 ... Panel, Air Box Divider w/Slot ................... - - - - ................. 210720-1 ............ 210720-1 ............ 210720-1 ............ 210720-1 ................. - - - -
39 .. ( ) .. Panel, Air Diverter ................................ 211080(2) ........... 211080(2) .......... 211080(2) ............ 211080(3) .......... 211080(3) ........... 211080(3)
40 .... 1 ... Panel, Front Combustion ....................... 210703 ............... 210703-1 ............ 210703-2 ............ 210703-3 ............ 210703-4 ............. 210703-5
41 .... 1 ... Panel, Side Air Chamber ....................... 211088 ................ 211088 ............... 211088 ................ 211088 ............... 211088 ................ 211088
42 .... 1 ... Panel, Side Air Chamber ..................... 211088-1 ............. 211088-1 ............ 211088-1 ............ 211088-1 ............ 211088-1 ............. 211088-1
43 .... 1 ... Panel, Top Combustion ......................... 210717 ............... 210717-1 ............ 210717-2 .............. 211135 .............. 211135-1 ............. 211135-2
44 .... 1 ... Plate, Divider Insert .................................. - - - - .................. 211134 ............... 211134 ................ 211134 ............... 211134 .................. - - - -
45 .... 1 ... Plate, Insert Mate ..................................... - - - - .................. 211309 ............... 211309 ................ 211309 ............... 211309 .................. - - - -
46 .... 1 ... Rear Combustion Assembly .................. 211254 ............... 211254-1 ............ 211254-2 ............ 211254-3 ............ 211254-4 ............. 211254-5
47 .. ( ) .. Screw Cap ............................................ 190960(8) ........... 190960(8) .......... 190960(8) ........... 190960(12) ........ 190960(12) ......... 190960(12)
48 .... 1 ... Side Panel Assembly ........................... 210716-1 ............. 210716-1 ............ 210716-1 ............ 210716-1 ............ 210716-1 ............. 210716-1
49 .... 1 ... Side Panel Assembly ............................. 210716 ................ 210716 ............... 210716 ................ 210716 ............... 210716 ................ 210716
50 .. ( ) .. Silicone Tube..................................... 210209-10(4) ...... 210209-10(4) ..... 210209-10(4) ...... 210209-10(6) ..... 210209-10(6)....... 210209-10(6)
51 .. ( ) .. Silicone Tube..................................... 210209-25(3) ...... 210209-25(3) ..... 210209-25(3) ...... 210209-25(4) ..... 210209-25(4)....... 210209-25(4)
52 .. ( ) .. Strain Relief .......................................... 210173(2) ........... 210173(2) .......... 210173(2) ............ 210173(3) .......... 210173(3) ........... 210173(3)
53 .. ( ) .. Strain Relief Tube Assembly ............... 210234(4) ........... 210234(4) .......... 210234(4) ............ 210234(6) .......... 210234(6) ........... 210234(6)
54 .... 1 ... Switch, Blocked Flue ............................ 210908-2 ............. 210908-2 ............ 210908-2 ............ 210908-2 ............ 210908-2 ............. 210908-2
GB/GW
55 .. ( ) .. Switch, Differential ............................... 211094(2) ........... 211094(2) .......... 211094(2) ............ 211094(3) .......... 211094(3) ........... 211094(3)
56 .. ( ) .. Switch, Differential - Prop. ................. 211094-1(2) ........ 211094-1(2) ....... 211094-1(2) ........ 211094-1(3) ....... 211094-1(3)......... 211094-1(3)
57 .... 1 ... Switch, Low Gas Nat/Prop ................. 191149-1/-3 .........191149-1/-3........ 191149-1/-3 ........ 191149-1/-3 ........191149-1/-3 ......... 191149-1/-3
Note: ( ) Item quantity.
* Items not illustrated.
CSD-1 and IRI Models subsitute the following part numbers for the Gas Train Assemblies:
•Item 11 substitute with 211082-2
•Item 13 substitute with 211081-2
•Item 12 substitute with 211082-3
•Item 14 substitute with 211081-3
2
COMBUSTION CHAMBER ASSEMBLY COMPONENTS
Gas Valv
Used
191956-
191956-
192454-
192454-
Gas Train
211081
211081-1
211082
211082-1
INSULATION ASSEMBLY COMPONENTS
3
Item Qty. Description
GB/GW
1000
GB/GW
1300
GB/GW
1500
GB/GW
1850
GB/GW
2100
GB/GW
2500
JACKET ASSEMBLY COMPONENTS:
1 ...... 1..... User Interface, Display............................... 211762.............. 211762 ............ 211762 ........... 211762 .............211762 ........... 211762
2 ...... 1..... Bracket, Control Box Support .................... 211362.............. 211362 ............ 211362 ........... 211362 .............211362 ........... 211362
3 ...... 1..... Cap, Pipe ....................................................43762-1 ............ 43762-1 ........... 43762-1 .......... 43762-2 ........... 43762-2 .......... 43762-2
4 ...... 1..... Control Box ................................................. 212458.............. 212458 ............ 212458 ........... 212458 .............212458 ........... 212458
5 ...... 2..... Gasket, Conduit.......................................... 211266.............. 211266 ............ 211266 ........... 211266 .............211266 ........... 211266
6 ...... 2..... Gasket, Main Gas Manifold ....................... 211045.............. 211045 ............ 211045 ......... 211045-1 ......... 211045-1 ........ 211045-1
7 ...... 2..... Gasket, Vent Adaptor ................................211049-1 .......... 211049-2 ......... 211049-2 ........ 211049-3 ......... 211049-3 ........ 211049-4
8 ...... 1..... Gasket, Vent Adaptor (Air Inlet) ................ 211049............ 211049-1 ......... 211049-1 ........ 211049-1 ......... 211049-2 ........ 211049-3
GB/GW
9 ..... ( ) ... Handle, Front Panel ................................. 191802(1) ......... 191802(1) ........ 191802(1) ....... 191802(2)........ 191802(2) ....... 191802(2)
10 ...... 2..... J-Box Cover .................................................. 2233 .................. 2233 ................ 2233 ............... 2233 .................2233 ............... 2233
11 ...... 2..... Junction Box ..............................................190438-4 .......... 190438-4 ......... 190438-4 ........ 190438-4 ......... 194038-4 ........ 194038-4
12 ...... 2..... Locknut, Star ................................................ 1953 .................. 1953 ................ 1953 ............... 1953 .................1953 ............... 1953
13 ...... 2..... Nipple, Chase .............................................. 41994 ................ 41994 .............. 41994 ............. 41994 ...............41994 ............. 41994
14 ..... ( ) ... Nut, Speed ................................................. 68463(4) ...........68463(4) .......... 68463(4) ......... 68463(7).......... 68463(7) ......... 68463(7)
15 ...... 1..... Panel, Display Ass’y. ............................. 212510-000 ...... 212510-000 ..... 212510-000.... 212511-001 ..... 212511-001.... 212511-001
16 ...... 1..... Panel, Front Bottom ................................... 211252............ 211252-1 ......... 211252-2 ........ 211252-3 ......... 211252-4 ........ 211252-5
17 ...... 1..... Panel, Rear Jacket ..................................... 210739............ 210739-1 ......... 210739-2 .......... 211137 ........... 211137-1 ........ 211137-2
18 ...... 1..... Panel, Right Jack. Ass’y. ........................... 211073............ 211073-1 ......... 211073-2 .......... 211282 ........... 211282-1 ........ 211282-2
19 ...... 1..... Panel, Side Access .................................... 210792.............. 210792 ............ 210792 ........... 210792 .............210792 ........... 210792
20 ...... 1..... Panel, Side Jacket ..................................... 210738.............. 210738 ............ 210738 ......... 210738-1 ......... 210738-1 ........ 210738-1
21 ...... 1..... Panel, Side Jacket ..................................... 210737.............. 210737 ............ 210737 ......... 210737-1 ......... 210737-1 ........ 210737-1
22 ...... 2..... Panel, Side Jacket Insert ........................... 211074.............. 211074 ............ 211074 ........... 211074 .............211074 ........... 211074
GB/GW
23 ...... 1..... Panel, Top Jacket ...................................... 210733............ 210733-1 ......... 210733-2 ........ 210733-3 ......... 210733-4 ........ 210733-5
24 ...... 1..... Panel, Mid-Jacket Ass'y. .............................. - - - -.................. - - - - ................ - - - - ............. 211072 .............211072 ......... 211072-1
25 ...... 1..... Plate, Conduit ............................................. 211265.............. 211265 ............ 211265 ........... 211265 .............211265 ........... 211265
26 ...... 1..... Plate, Conduit - 2 Holes ............................211265-1 .......... 211265-1 ......... 211265-1 ........ 211265-1 ......... 211265-1 ........ 211265-1
27 ...... 1..... Plate, Flue................................................... 211047............ 211047-1 ......... 211047-1 ........ 211047-2 ......... 211047-2 ........ 211047-3
28 ...... 2..... Plate, Main Gas Manifold ........................... 211046.............. 211046 ............ 211046 ......... 211046-1 ......... 211046-1 ........ 211046-1
29 ...... 1..... Plate, Top Jacket ....................................... 211142.............. 211142 ............ 211142 ........... 211142 .............211142 ........... 211142
30 ..... ( ) ... Screw, Panel.............................................. 68462(4) ...........68462(4) .......... 68462(4) ......... 68462(7).......... 68462(7) ......... 68462(7)
31 ..... ( ) ... Screw, Sheet Metal ............................... 210125-1(52) .... 210125-1(56) .. 210125-1(56) . 210125-1(56) ...210125-1(56) . 210125-1(56)
32 ...... 1..... Switch, Rocker...........................................191665-1 .......... 191665-1 ......... 191665-1 .......... 212839 .............212839 ........... 212839
33 ...... 1..... Valve, Ball 2 X 2 .........................................69022-2 ............ 69022-2 ........... 69022-2 ............. - - - - ................. - - - - ............... - - - -
34 ...... 1..... Valve, Ball 2 1/2 X 2 1/2 .............................. - - - -.................. - - - - ................ - - - - ............ 69022-3 ........... 69022-3 .......... 69022-3
35 ...... 1..... Vent Adaptor - Exhaust .............................210783-1 .......... 210783-2 ......... 210783-2 ........ 210783-3 ......... 210783-3 ........ 210783-4
36 ...... 1..... Vent Adaptor - Air Inlet .............................. 210783............ 210783-1 ......... 210783-1 ........ 210783-1 ......... 210783-2 ........ 210783-2
37 ...... 4..... Washer, Locknut ........................................ 210207.............. 210207 ............ 210207 ........... 210207 .............210207 ........... 210207
GB/GW
38 ..... ( ) ... Washer, Retaining (SPL) .......................... 68338(4) ...........68338(4) .......... 68338(4) ......... 68338(7).......... 68338(7) ......... 68338(7)
Item
Qty. Description
GB
GB
GB
GB
GW
GW
GW
1000, 1300
1500
1850, 2100
2500
1000 - 1500
1850
2100, 2500
WATER HEATER CONNECTIONS:
1 ...... 1..... Flow Switch Conduit Ass'y. ............ 211156 ........ 211156 ........ 211156 ....... 211156 ......... 211156 .......... 211156 ............. 211156
2 ...... 1..... Inlet Temp Conduit Ass'y. ............ 210180-1 ..... 210180-1 ..... 210180-1 .... 210180-1 ...... 210180-1 ....... 210180-1 .......... 210180-1
3 ...... 1..... Low Water Cutoff............................ 210376 ........ 210376 ........ 210376 ....... 210376 ......... 210376 .......... 210376 ............. 210376
4 ...... 1..... Low Water Cutoff Conduit Ass'y .... 211118 ........ 211118 ........ 211118 ....... 211118 ......... 211118 .......... 211118 ............. 211118
5 ...... 1..... Outlet Conduit Ass'y..................... 210181-1 ..... 210181-1 ..... 210181-1 .... 210181-1 ...... 210181-1 ....... 210181-1 .......... 210181-1
6 ...... 1..... Pump - 1/2 HP Volute ...................... - - - - ............ - - - - ............ - - - - ........... - - - - ........... 211324 ............. - - - - ................. - - - -
7 ...... 1..... Pump - 1 HP Volute ......................... - - - - ............ - - - - ............ - - - - ........... - - - - ............. - - - - ............ 211251 ............. 211251
8 ...... 1..... Relief Valve-125 psi ......................... - - - - ............ - - - - ............ - - - - ........... - - - - .......... 98883-3 ......... 98883-3 ............ 98883-7
9 ...... 1..... Relief Valve-50 psi ....................... 210451-1 ..... 210451-2 ..... 210451-2 .... 210451-3 .......... - - - - ............... - - - - ................. - - - -
10 ...... 1..... Switch - Flow .................................. 210176 ........ 210176 ........ 210176 ....... 210176 ......... 210176 .......... 210176 ............. 210176
GB/GW
*11 ...... 1..... Tank Probe ....................................... - - - - ............ - - - - ............ - - - - ........... - - - - ......... 210211-1 ....... 210211-1 .......... 210211-1
Note: ( ) Item quantity. * Items not illustrated.
4
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