Bosch C 1050 Manual

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Interior components diagram and parts list61
ItemDescriptionReference
1 Heat exchanger 8 705 406 421 
2 Heat exchanger top gasket 8 704 701 052 
3 Condensing exchanger inlet 8 705 700 159 
4 Overheat sensor (ECO) 8 707 206 204
5 Heat exchanger bottom gasket 8 704 701 054
6 Site window 8 701 000 401 
7 Ignition group 8 701 302 249 
8 Heat exchanger O-ring 8 700 205 147
9 Rubber grommet 8 710 303 027 
10 Connecting pipe 8 700 715 403 
11 Pipe connection clip 8 701 201 028
12 Condensing exchanger gasket 8 704 701 090 
13 Condensing exchanger nut 8 703 301 157 
14 Condensing heat exchanger 8 705 700 161
15 Condensing exchanger left side 8 705 700 162
16 Condensing exchanger side gasket 8 704 701 091 
17 Allen screw 2 918 060 162 
18 Condensing exchanger right side 8 705 700 163
19 Screw 2 910 611 496 
20 Fincoil O-ring 8 700 205 226 
21 Condensing fincoil 8 700 715 402
22 O-ring  8 700 205 228 
23 Condensate drain connector 8 705 506 838 
24 Condensate drain connector gasket 8 704 701 092
25 Exhaust temperature sensor 8 707 206 459
26 Washer 8 704 701 097 
27 U-bend pipe 8 703 305 352 
28 Condensing exchanger clip 8 701 300 023
29 Offset pipe 8 700 715 396 
30 Flue gas collector 8 705 506 841 
31 Cold water pipe upper 8 700 715 398
32 Siphon 8 705 202 141 
33 Condensate drain pipe 8 700 703 177 
34 Condensate drain pipe clip 8 716 102 607
35 Condensate drain pipe O-ring 8 704 701 094
Table 31 
						

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Interior components diagram and parts list 
12.2.3 Group 3 
Fig. 81 Components Diagram
15
14
1
3
4
6
7
8
2
12
9
11
13
16
17
5
6720902975.AA JF
ItemDescriptionReference
1 Main burner (Natural Gas) 8 708 120 642 
1 Main burner (LP Gas) 8 708 120 699 
2 Burner gasket 8 704 701 087 
3 Primary fan 8 707 204 071
4 Backflow temperature sensor 8 707 206 459
5 Washer 8 704 701 097 
6 Fan mount nut 2 915 011 006 
7 Secondary fan 8 707 204 074
8 Screw 8 703 403 012
Table 32
9 Gas / Air Mixer 8 705 700 170 
11 Venturi 8 700 306 226 
12 O-ring 8 700 205 224
13 Mixer / Fan gasket 8 704 701 059
14 Screw 2 910 642 150 
15 Plate gasket 8 701 004 049 
16 Air supply duct 8 705 700 155
17 Screw 2 910 952 122
ItemDescriptionReference
Table 32 
						

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Interior components diagram and parts list63
12.2.4 Group 4 
Fig. 82 Components Diagram
9
2
14
1
3
4
5
6
7
8
11
11
12
13
10
6720902976.AA JF
ItemDescriptionReference
1 Gas valve 8 707 021 019 
2 Pressure tapping 8 703 404 219
3 Washer 8 700 203 041 
4 Pressure balance tube 8 700 703 136 
5 Pressure balance nut 8 703 300 041
6 Gas supply pipe 8 700 715 389
7 Gas valve washer 8 700 103 014
Table 33
8 Gas filter 8 700 507 002 
9 Gasket 8 704 701 085 
10 Gas / Fan connector 8 705 202 140 
11 Washer 8 704 701 062
12 Regulation screw 8 703 404 220
13 O-ring 8 700 205 009 
14 Screw 2 910 149 181
ItemDescriptionReference
Table 33 
						

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Interior components diagram and parts list 
12.2.5 Group 5 
Fig. 83 Components Diagram
9
11
12
13
10
1
2
3
4
4
5
6
7
8
9
11
14
15
16
17
12
6720902977.AA JF
(optional)
ItemDescriptionReference
1
Water valve with engine and  
temperature sensor 8 708 505 024
2 O-ring 8 700 205 147 
3 Cold water pipe 8 700 715 394 
4 Pipe connection clip 8 701 201 028
5 Hot water pipe 8 700 715 469 
6 Temperature sensor 8 700 400 015 
7 Outlet fitting 8 703 305 349
8 Inlet / Outlet washer 8 710 103 045 
9 Wireform spring 8 701 300 025
Table 34
10 Inlet fitting 8 703 305 348 
11 O-ring 8 700 205 157
12 Watervalve clip 8 716 102 607 
13 Water filter 8 700 507 001 
14 Inlet fitting with filter (optional) 8 703 305 356
15 Washer (optional) 8 700 103 764 
16 Water filter (optional) 8 700 507 059 
17 O-ring (optional) 8 700 205 231
ItemDescriptionReference
Table 34 
						

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Interior components diagram and parts list65
12.2.6 Group 6 
Fig. 84 Components Diagram
3
7
6
9
5
10
4
1
2
15
13
16
14
12
6720608158-75.2V
11
ItemDescriptionReference
1 Control unit 8 707 207 368 
2 Fuse T2.5A  1 904 521 342
3 Fuse T1.6A  8 700 609 008
4 Power supply cables  8 704 401 371 
5 Power supply cord  8 704 401 378 
6 Fan cables 8 704 401 347
7 Wire harness  8 704 401 348 
9 Electrode cables  8 704 401 346
Table 35
10 Flue gas limiter 8 700 400 032 
11 Kit Inteligent Cascading 7 709 003 962
12 Anti freeze kit 7 709 003 665 
13 Remote control (optional) TSTAT2 
14 Shaped seal (optional) 8 700 201 012
15 Screw (optional) 8 703 401 109 
16 Printed circuit transciever (optional) 8 708 300 1
23
ItemDescriptionReference
Table 35 
						

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Protecting the environment
13 Protecting the environment 
Packing 
The packing box may be fully recycled as confirmed 
by
the recycling symbol  . 
Components 
Many parts in the heater can be fully recycled in t he end
of  the  product  life.  Contact  your  city  authorities  for
information about the disposal of recyclable produc ts.
Saving water resources: B Make sure you close all the taps after any use. Avo id
leaving the taps dripping. Repair any leaking tap.
B Define the temperature you want, in the appliance o r
with  the  remote  control.  This  way  you  have  the 
precise  water  flow  needed  (mixing  cold  water  to
regulate temperature will increase the water flow w ith
consequent waste of water).   
						

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Limited Warranty67
14 Limited Warranty
General 
BOSCH PRO tankless water heaters are warranted by 
the  Manufacturer  (BOSCH)  through  Bosch
Thermotechnology Corp.  
Bosch  Thermotechnology  Corp.   will  furnish  a
replacement  heat  exchanger  and  will  furnish  a
replacement of any other part which fails in normal  use
and  service  within  the  applicable  periods  specified
below,  in  accordance  with  the  terms  of  this  warrant y.
The  Bosch  Thermotechnology  Corp.   replacement  will
be  warranted  for  the  unexpired  portion  of  the  origi nal
warranty.  This  warranty  will  be  valid  only  for  wate r
heaters  in  possession  of  the  original  purchaser  as
recorded on the warranty card. 
The Heat Exchanger 
If the heat exchanger fails within Fifteen (15) yea rs after
the  original  installation  and  operation,  Bosch
Thermotechnology  Corp.   will  furnish  a  replacement
heat  exchanger.  However,  if  the  water  heater  is  use d
within an approved hot water recirculation and supp lied
with  circulated  water,  this  heat  exchanger  warranty   is
limited to three (3) years from date of original in stallation
and  operation.    If  the  water  heater  is  installed  in   other
than  a  single  family  dwelling,  this  heat  exchanger 
warranty is limited to two (2) years from date of o riginal
installation and operation. 
Exceptions 
This warranty will not apply:• 1. to defects or malfunctions resulting from failure  to
properly install,  operate  or  maintain  the  unit  in 
accordance with the printed instructions provided;
• 2. to damage or abuse, accident, neglect or freezing
and other acts of nature;
• 3. to damage resulting from operation with either the
flame sensor rod or overheat sensor removed;
• 4. to failure of the heat exchanger resulting from th e
operation  of  the  water  heater  in  a  corrosive
atmosphere or at water temperatures  exceeding  the
maximum rating, or if the water heater is not suppl ied
with potable water;
• 5.  to  defects  or  damage  cause  by  any  attachment
or modification, including any energy-saving device;
• 6.  to  damage  resulting  from  scale  deposits  and/or
highly mineralized / unsoftened water supply.
All Other Parts 
If  any  other  part  fails  within  five  (5)  years  after   original
installation  and  operation,  Bosch  Thermotechnology
Corp.  will furnish a replacement part free of charge. Service Labor Costs
This  warranty  does  not  cover  any  labor  costs 
associated  with  service,  removal  or  re-installation
  of
part(s). All such costs must be borne by the Purcha ser.
Additionally,  this  warranty  does  not  cover  any  labo r
costs  associated  with  service,  removal,  installatio n  or
re-installation of the original water heater or a r eplaced
water heater. 
How to Make a Claim 
Any  claim  for  warranty  parts  should  be  made  to  your 
local dealer or distributor: 
BOSCH THERMOTECHNOLOGY CORP. 
50 Wentworth Avenue
Londonderry, NH 03053
Tel. 866-330-2730
www.boschpro.com 
In  most  cases,  the  dealer  or  distributor  will  be  ab le  to
promptly  honor  your  claim  and  subsequently  notify 
Bosch  Thermotechnology  Corp. .  However,  all
replacements are made subject to validation by  Bosch
Thermotechnology  Corp.   of  in-warranty  coverage.  The
damaged  or  defective  item  must  be  made  available  in
exchange for the replacement. 
Miscellaneous 
No  one  is  authorized  to  make  any  other  warranties  o n
behalf  of  Bosch  Thermotechnology  Corp. .  It  is
expressly  understood that the replacement warranty  of
Bosch  Thermotechnology  Corp.   shall  be  in  lieu  of  any
and  all  other  warranties,  express  or  implied,  inclu ding
warranties  of  merchantability  or  fitness  for  a  part icular
use  or  purpose,  and  further  that  Bosch
Thermotechnology Corp.  shall not be liable for any loss
or  damage  directly  or  indirectly  arising  from  the  u se  of
the hot water heater, or for any consequential dama ges
arising  from  such  use  (including  damages  from  water 
leakage).  Bosch  Thermotechnology  Corp.   sole  liability
with respect to any defect shall be for the replace ment
of the defective part(s). Some states do not allow  such
limitations and  exclusions,  so  the  above  may  not ap ply
to you.
This  warranty  gives  specific  legal  rights.  You  may  also
have other rights which vary from state to state.
i
NOTE:  the  water  heater  must  be  free  of 
damaging scale deposits and not subject
to  gas  pressures  greater  than  those
shown on the rating plate, which must not
be altered, defaced or removed . 
						

							Replacement Parts available from:
Bosch Termotecnologia SAEstrada de Cacia
3800 - 533 Cacia - PORTUGAL
© 2010 Bosch Thermotechnology Corp., 
Londonderry, N H
BOSCH THERMOTECHNOLOGY  
CORP. 
50 Wentworth Avenue 
Londonderry, NH 03053 USA 
Tel. 866-330-2730 
www.boschpro.com
Installer Checklist to be completed by installer up on installation 
Serial Number ___ ___ ___ ___ ___ ___ ___ ___
(8 digit serial number is located on rating plate on right side panel)
Gas Pressure Reading* Static__________ Operating_____ _____
Building Water Pressure __________  Range if on Well  system __________
Installing Company _________________________________ ____________
Installer name _____________________________________ ________
Address ____________________________________________ _
Phone _____________________________________________
* See Chapter 3.14, page 35 and gas pressure table ( to be filled out by installer)
Installation manual should be left with the owner a fter the installation is tested and completed
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