Bosch Model GWH 425 - Manual (Page 24)

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Interior components and diagram parts list
8 Interior components and diagram parts list
8.1 Interior components
Fig. 28 Functional scheme
4 Heat exchanger
5 Burner
10 Temperature adjustment selector
11 Water valve
20 Gas connection
22 Flexible hot outlet
26 Gas control slide
30 Pilot gas tubing
102 Piezo