Introduction
This document provides a comprehensive spare parts list for the Buderus GB402 boiler, covering models from 320 kW to 620 kW, manufactured from December 2018 onwards (as indicated by the We designation). It includes detailed diagrams and part numbers for various components.
Important Notes on Installation and Assembly
[en] The installation/assembly must be carried out by a professional who is authorised to do the work, and with due regard to the relevant regulations.
(Note: This document is multilingual, with important installation notes provided in numerous languages including German, French, Spanish, Turkish, Dutch, and many others.)
Boiler Block (Kesselblock GB402)
Diagram Description: This section illustrates the main boiler block (Kesselblock GB402). It shows the primary heat exchanger assembly, distributors, various pipe connections, fittings, sensors, and seals. Components are identified by numbers corresponding to the parts list below.
| Pos | Description | Ordering No. | Remarks |
|---|---|---|---|
| 1 | Kesselblock GB402 5Gld | 8 718 572 144 0 | |
| 1 | Kesselblock GB402 6Gld | 8 718 572 145 0 | |
| 1 | Kesselblock GB402 7Gld | 8 718 572 146 0 | |
| 1 | Kesselblock GB402 8Gld | 8 718 572 147 0 | |
| 1 | Kesselblock GB402 9Gld | 8 718 572 148 0 | |
| 2 | Verteiler VK 9Gld | 8 718 572 150 0 | |
| 2 | Verteiler VK 7Gld | 8 718 574 241 0 | |
| 2 | Verteiler VK 8Gld | 8 718 578 161 | |
| 2 | Verteiler VK 6Gld | 8 718 578 163 | |
| 2 | Verteiler VK 5Gld | 8 718 578 165 | |
| 3 | Verteiler RK 9Gld | 8 718 572 151 0 | |
| 3 | Verteiler RK 7Gld | 8 718 574 242 0 | |
| 3 | Verteiler RK 8Gld | 8 718 578 162 | |
| 3 | Verteiler RK 6Gld | 8 718 578 164 | |
| 3 | Verteiler RK 5Gld | 8 718 578 166 | |
| 4 | 6kt-Schraube EN1665 M12x60 (6x) | 8 718 574 248 0 | |
| 5 | O-Ring 40,64 x 5,33 EPDM (5x) | 8 718 574 243 0 | |
| 7 | Blindflansch GB402 | 8 718 572 152 0 | |
| 8 | Reinigungsdeckel Kbl GB402 | 8 718 572 149 0 | |
| 9 | Dichtung Reinigungsdeckel (4x) | 8 718 574 245 0 | |
| 10 | Deckel Kondenswanne GB402 | 8 718 572 153 0 | |
| 11 | Dichtung Deckel Kondwanne GB402 | 8 718 574 246 0 | |
| 12 | Dichtung Abgas DN250 (1x) | 8 718 572 154 0 | |
| 13 | Kessel-/STB-Fühler G1/4 45lg | 63024877 | |
| 14 | Drucktransmitter-Set | 8 718 595 966 | FD<08/2014 |
| 14 | Druck-Transmitter Typ503.93010111 | 8 738 804 598 | FD>=08/2014 |
| 15 | KFE-Hahn R1/2 Bekaert 048-250 | 8 718 574 837 | |
| 20 | Red-Nippel Rp 3/4xG1/4 MS | 63038415 | |
| 21 | Vor-/Rücklauffühler G1/4 45lg | 63041677 | |
| 22 | Siphon 145mm Sperrhöhe | 63037864 | |
| 23 | Siphon GB402 Fittings | 8 718 572 157 0 | Zubehör |
| 24 | Abgas-Rohr DN250 mit Stutzen | 8 718 572 159 0 | |
| 25 | Abgas-Bogen 87Grd DN250 verp | 8 718 572 276 | |
| 26 | Anschluss-Schlauch DN19-Win G 3/4" | 63041596 | |
| 27 | Gerätefüße M10x51mm (Set 4St.) | 5236440 | |
| 28 | 6kt-Mutter EN1661 M12 (6x) | 8 718 574 249 0 | |
| 29 | O-RING 123,19x5,33 EPDM (2x) | 8 718 574 244 0 | |
| 32 | Reduzierstück R1/2xG3/8 m Dichtung | 8 718 574 614 0 | |
| 33 | 6kt-Mutter DIN985 M10 (10x) | 8 718 574 251 0 | |
| 34 | Scheibe ISO 7089 M10 (10x) | 8 718 574 250 0 | |
| 35 | Deckel Kondenswanne GB402-320 | 8 718 578 156 | |
| 36 | Resonator Ø108x250 | 8 718 578 152 | |
| 37 | Resonator Ø108x365 | 8 718 578 151 | |
| 38 | Dichtung D=40x2 SIL 24 | 8 718 579 465 | |
| 39 | 6kt-Mutter DIN6923 M8 A3K (10x) | 8 718 571 267 0 | |
| 40 | 6kt-Mutter M6 (8x) | 8 718 580 072 | |
| 41 | Stopfen 1/2 | 8 718 582 108 | |
| 42 | Reduzierstück 1/2x1/4 | 8 718 582 109 | |
| 43 | Schlauchtülle G3/4x20 gewinkelt | 8 738 803 123 | |
| Silikon Wezilit EV-300rot bis 300°Ceverp | 8 718 590 462 |
Housing (Verkleidung)
Diagram Description: This section shows the outer casing components of the Buderus GB402 boiler, including the front panel, top cover, rear panels, and side panels. These parts protect the internal components and provide the boiler's external structure.
| Pos | Description | Ordering No. |
|---|---|---|
| 1 | Vorderwand R1000 GB402 | 8 718 571 379 0 |
| 2 | Haube vorn GB402 | 8 738 803 471 |
| 3 | Haube hinten GB402 | 8 718 571 381 0 |
| 4 | Seitenwand vorn GB402 | 8 718 571 382 0 |
| 5 | Seitenwand hinten GB402 | 8 718 571 383 0 |
| 6 | Rückwand oben GB402 | 8 718 572 163 0 |
| 7 | Rückwand unten GB402 | 8 718 572 164 0 |
| 8 | Abdeckung Haube vorn | 8 718 572 165 0 |
| 9 | Flachkopfschraube ST3,9x9,5 A3T (10x) | 7 747 026 999 |
| 10 | Schnappm. 4,2 A3K SNO6930 Winkelf. | 8 718 572 167 0 |
| 11 | Blechschraube C ST3,9x13 A3T (10x) | 8 718 572 168 0 |
| 12 | Kabelkanal gep GB402 | 8 718 572 169 0 |
| 13 | Geräteschild "Buderus" | 7 747 025 087 |
Insulation (Wärmeschutz)
Diagram Description: This section details the thermal insulation components used in the GB402 boiler to maintain efficiency and safety. It shows various insulation panels and mounting hardware.
| Pos | Description | Ordering No. |
|---|---|---|
| 1 | Haltefeder (10x) | 7 747 016 084 |
| 2 | Spannfedern (5x) | 63043772 |
| 3 | Haltewinkel Wärmeschutz | 8 718 572 170 0 |
| 4 | Wärmeschutz oben 320kW | 8 718 573 859 |
| 4 | Wärmeschutz oben 395kW | 8 718 573 860 |
| 4 | Wärmeschutz oben 470kW | 8 718 573 861 |
| 4 | Wärmeschutz oben 545kW | 8 718 573 862 |
| 4 | Wärmeschutz oben 620kW | 8 718 573 863 |
| 5 | Wärmeschutz vo/seitl. 395kW | 8 718 573 864 |
| 5 | Wärmeschutz vo/seitl. 470kW | 8 718 573 865 |
| 5 | Wärmeschutz vo/seitl. 545kW | 8 718 573 866 |
| 5 | Wärmeschutz vo/seitl. 620kW | 8 718 573 867 |
| 5 | Wärmeschutz vo/seitl. 320kW | 8 718 573 868 |
| 6 | Wärmeschutz Rücklauf 320-620kW | 8 718 573 869 |
| 7 | Wärmeschutz Vorlauf/Rücklauf | 8 718 573 870 |
| 8 | Wärmeschutz vo 120 | 7 747 011 126 |
| 8 | Wärmeschutz vo 160 | 7 747 011 127 |
| 8 | Wärmeschutz vo 200 | 7 747 011 128 |
| 8 | Wärmeschutz vo 240 | 7 747 011 129 |
| 8 | Wärmeschutz vo 280 | 7 747 011 130 |
Connection Parts (Anschlussteile)
Diagram Description: This section illustrates various connection components, including inlet and outlet connectors, safety sets, pressure gauges, air vents, and valves. These parts are crucial for the proper integration and operation of the boiler system.
| Pos | Description | Ordering No. | Remarks |
|---|---|---|---|
| 1 | Vorlauf-Anschluss GB402 | 8 718 573 175 0 | |
| 2 | Rücklauf-Anschluss GB402 | 8 718 573 176 0 | |
| 3 | O-RING 123,19x5,33 EPDM (2x) | 8 718 574 244 0 | |
| 4 | Sicherheits-Set 2" m. Manom. u. Entlüft | 8 718 572 719 | |
| 5 | Röhrenf Mano m 2 100mm D 1/2"0-10bar | 81188605 | |
| 6 | Entlüfter Autom m. Absperrvent 3/8 | 8 718 585 257 | |
| 7 | Kappenventil mit KFE-Hahn | 8 718 584 428 | |
| 8 | Armaturenbalken 3-fach m. Kappenv. 3/4 | 8 718 572 302 | |
| 9 | Flachdichtung PN16 DN32 43x82x2 | 8 718 573 733 0 | |
| 10 | Stopfen, Satz f. Sicherheits-Armaturengr | 5639660 | |
| 11 | Dichtscheibe DIN 6,2x17,5 (5x) | 8 718 573 507 0 | |
| 12 | Druckbegrenzer DSH143 F001 | 81855160 | |
| 16 | Dichtung D17x24x2 AFM34 (10x) | 7 747 016 505 | |
| 17 | Gewindeflansch DIN2566 C 32 1,0038 | 80659022 | |
| 18 | Fitt. TG schw.246# Reduziermuffe 2x11/4 | 89217707 | |
| 19 | Logafix Membran Sicherheitsventil 2" 3bar | 80805040 | |
| 20 | ARI-SAFE-12903,DN32/50,PN16,EN-JL1040 6b | 7 747 434 991 | Zubehör (3 bar) |
| 21 | Fed-Sicherh-Vent GG Wei DN32/50 4,0bar | 82643566 | Zubehör (6 bar) |
| 22 | SAFE-12903 GG weichd. DN32/50 5,0bar | 82643570 | Zubehör (4bar) |
| Zubehör (5bar) |
Burner Pipe, Mixing Unit (Brennerrohr, Mischeinrichtung)
Diagram Description: This section details the burner assembly, including the burner pipe, mixing unit, ignition electrode, and associated components. These parts are critical for the combustion process.
| Pos | Description | Ordering No. |
|---|---|---|
| 1 | Zünd-/Überwachungselektrode VM402 | 8 718 573 446 0 |
| 2 | Schrauben-Set M5x16 DIN7500 Torx (4x) | 7 747 016 863 |
| 4 | Dichtung Zündelektrode (5x) | 8 718 573 445 0 |
| 5 | Zündkabel | 63040094 |
| 6 | Brennerrohr 620kW | 8 718 573 436 0 |
| 6 | Brennerrohr 470kW | 8 718 573 438 0 |
| 6 | Brennerrohr 545kW | 8 718 578 146 |
| 6 | Brennerrohr 395kW | 8 718 578 147 |
| 6 | Brennerrohr 320kW | 8 718 578 148 |
| 7 | Sechskanntmutter EN1661-M6-A2-70 (10x) | 8 718 573 443 0 |
| 8 | Dichtung Brennerrohr (5x) | 8 718 573 433 0 |
| 9 | O-Ring 221,62x5,33mm | 8 718 573 434 0 |
| 10 | Rohrstutzen | 8 718 573 430 0 |
| 11 | Druckmessdüse G1/8" Set | 7 747 022 048 |
| 12 | Schraubhülse (4x) | 8 718 573 449 0 |
| 13 | Sechskantmutter EN1661 M12 8.8 A3K (5x) | 8 718 573 416 0 |
| 14 | Dichtung G3G250 (2x) | 8 718 573 447 0 |
| 15 | Federstecker D18,5 (5x) | 8 718 573 419 0 |
| 16 | Brennerschlitten G3G250 | 8 718 573 448 0 |
| 17 | Brennerschlitten DN90 G3G250 | 8 718 578 149 |
| 18 | Wartungsset Brenner | 8 718 587 281 |
| 19 | Umstt GB402 395kW-620kW | 8 738 804 652 |
| 19 | Umstt GB402 320kW | 8 738 804 654 |
Fan, Air Supply System (Gebläse Zuluftsystem)
Diagram Description: This section illustrates the fan unit and its air intake components, including the fan motor, air intake pipes, and clamps. This system is responsible for providing combustion air.
| Pos | Description | Ordering No. | |
|---|---|---|---|
| 1 | Gebläse EBM G3G250-GN17-27 | 8 718 573 450 0 | |
| 2 | 6kt-Schraube ISO4017 M10x30 8.8 A3K (5x) | 8 718 573 452 0 | |
| 3 | Mischeinrichtung MBC-700-N | 8 718 573 454 0 | |
| 4 | 6kt-Schraube M8-12 (10x) | 8 718 573 457 0 | |
| 5 | Sechskantmutter ISO 10511 M6-8 A2K (5x) | 8 718 573 462 0 | |
| 6 | Luftzufuhr AIC-200-220-WND V2 | 8 738 806 286 | |
| 8 | Feder U-form (5x) | 8 718 573 460 0 | |
| 9 | Schlauch Zuluft DN200/203 mSchelle | 8 718 573 470 0 | |
| 10 | Schelle DN200 | 8 718 574 789 0 | |
| 11 | Adapter Flansch Zuluft DN200 Muffe verp | 8 718 572 875 | Zubehör |
| 12 | Adapter Flansch Zuluft DN200 Stecks verp | 8 718 572 876 | Zubehör |
| 13 | Stutzen Zuluft Flansch/DN200 EN1506 verp | 8 718 573 678 | Zubehör |
| 14 | Mischeinrichtung MBC-300-N | 8 718 578 129 |
Gas Valve, Gas Connection Pipe (Gasarmatur, Gasanschlussrohr)
Diagram Description: This section illustrates the gas valve assembly and its associated connection pipes and fittings. These components manage the fuel supply to the burner.
| Pos | Description | Ordering No. |
|---|---|---|
| 1 | Gasarmatur MBC-700-N Shutter 230V | 8 718 573 426 0 |
| 1 | Gasarmatur MBC-300-N Shutter 230V | 8 718 578 127 |
| 2 | O-Ring MBC700 (2x) | 8 718 573 476 0 |
| 2 | O-Ring MBC300 (2x) | 8 718 578 134 |
| 3 | Filter Gasarmatur MBC700 | 8 718 573 478 0 |
| 3 | Filter Gasarmatur MBC300 | 8 718 578 137 |
| 4 | Kompensationsleitung VM402 kpl | 8 718 574 970 0 |
| 5 | Druckwächter VPS MBC700/300 | 8 718 573 485 0 |
| 6 | Sechskantmutter ISO 10511 M6-8 A2K (5x) | 8 718 573 462 0 |
| 7 | Sechskantmutter EN1661 M8 A3K (5x) | 8 718 573 467 0 |
| 8 | Gasanschlußrohr WND700 | 8 718 573 463 0 |
| 8 | Gasanschlußrohr WND300 | 8 718 578 144 |
| 9 | Schrauben-Set M8x35 DIN912 (4x) m O-Ring | 8 718 573 487 0 |
| 9 | Schrauben-Set M6x25 DIN912 (4x) m O-Ring | 8 718 578 141 |
| 10 | Meßstutzen kpl. G 1/8 | 8 718 573 488 0 |
SAFe 42, Connection Lines (SAFe 42, Anschlussleitungen)
Diagram Description: This section shows electrical connection components and wiring harnesses, specifically related to the SAFe 42 system. These parts are essential for the boiler's control and safety functions.
| Pos | Description | Ordering No. | Remarks |
|---|---|---|---|
| 1 | Gehäuse Klemmenabdeckung SAFe | 63023925 | |
| 2 | SAFe42*1 V4/S07 | 8 738 803 950 | |
| 3 | Gehäuse Unterteil SAFE | 63023930 | |
| 4 | Zündtrafo MCT TYP ZA20120A11-01/TS | 8 718 573 756 0 | Nur für Service-Techniker |
| 5 | Schraube DIN7500 CE M5x12 KombiTorx Set | 63010217 | |
| 6 | Modul BIM42 V10 GB402-470 | 8 718 575 105 0 | Nur für Service-Techniker |
| 6 | Modul BIM42 V10 GB402-620 | 8 718 575 107 0 | Nur für Service-Techniker |
| 6 | Modul BIM42 V10-395kW. | 8 718 595 912 | Nur für Service-Techniker |
| 6 | Modul BIM42 V10-545kW. | 8 718 576 161 | Nur für Service-Techniker |
| 6 | Modul BIM44 6101-V22 GB402 320 | 8 718 576 163 | Nur für Service-Techniker |
| 7 | Abgasdruckbegrenzer | 8 738 807 203 | |
| 8 | Verbindungsl. Gasdruckwachter GB402 | 8 718 573 491 0 | |
| 9 | Schraube DIN7500 CE M5x12 KombiTorx Set | 8 718 573 627 0 | |
| 10 | Schlauch DN5x1,5x335 Viton | 63010217 | |
| 11 | Datenleitung SAFe MC10 BE | 8 718 587 615 | |
| 12 | Verbindungsleit. Kesselfühler GB402 | 63030150 | |
| 13 | Verbindungsl. Vor/Rucklauffuh GB402 | 8 718 573 640 0 | |
| 14 | Verbindungsltg Gebl PWM WIDW GB402 | 8 718 573 626 0 | |
| 15 | Leitung Ionisation Erdgas Gx44 | 8 718 573 628 0 | FD<=456 |
| 16 | Verbindungslt. MC10-SAFe-Gebl GB402 | 63034187 | |
| 17 | Zündleitung SAFe 230V | 8 718 573 624 0 | |
| 18 | Verbindungsleitung MV1 VM Brenner GB402 | 8 738 802 738 | |
| 19 | Verbindungsltg Gebl PWM WIDW GB402 | 8 718 573 625 0 | FD>=456 |
Country-Specific Information
The document also includes tables detailing appliance types and their corresponding ordering numbers and target countries. These cover a wide range of European countries, including Belgium, Germany, France, Luxembourg, Denmark, England, Italy, Netherlands, Poland, Portugal, Spain, Romania, Russia, Switzerland, Slovakia, Czech Republic, Turkey, Ukraine, and Hungary.
Manufacturer Information
Bosch Thermotechnik GmbH
Sophienstr. 30-32
D-35576 Wetzlar / Germany
