A. O. Smith GB-1300 Parts List

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

website: www.hotwater.com/parts • email: [e-mail]

PRINTED IN U.S.A. 0906 PART NO. 212513-000

Phone: [phone] • Fax: [phone]

1

Item Qty. Description GB/GW GB/GW GB/GW GB/GW GB/GW GB/GW

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

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 Ex chgr. 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

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 ..................................

36.. ( ) ..Orifice-Propane .................................

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

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.

GB/GW
GB/GW
GB/GW

GB/GW

CSD-1 and IRI Models subsitute 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

1000 1300 1500 1850 2100 2500

210758-111(10) ..... 210758-111(13) ... 210758-111(15) ..... 210758-111(19) ... 210758-111(21)..... 210758-111(25)

210758-75(10) ....... 210758-75(13) ..... 210758-75(15) .......210758-75(19) ..... 210758-75(21)....... 210758-75(25)

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COMBUSTION CHAMBER ASSEMBLY COMPONENTS

Gas Valves

Gas Train Used Description

211081 191956-2 Gas Valve, Natural Gas
211081-1 191956-1 Gas Valve, Propane Gas
211082 192454-3 Gas Valve, Natural Gas
211082-1 192454-1 Gas Valve, Propane Gas

INSULATION ASSEMBLY COMPONENTS

3

Item Qty. Description GB/GW GB/GW GB/GW GB/GW GB/GW GB/GW

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

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

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 ...........

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

38 ..... ( ) ...Washer, Retaining (SPL) ..........................68338(4) ...........68338(4) .......... 68338(4) .........68338(7).......... 68338(7) ......... 68338(7)

GB/GW
GB/GW
GB/GW

1000 1300 1500 1850 2100 2500

.....212510-000.... 212511-001 .....212511-001.... 212511-001

211074.............211074 ........... 211074

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

*11 ...... 1.....Tank Probe ....................................... - - - - ............ - - - - ............ - - - - ........... - - - - ......... 210211-1 .......210211-1.......... 210211-1

Note: ( ) Item quantity. * Items not illustrated.

GB/GW

4