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2
Index
Index
1 Warning 3
2 Appliance details 5
2.1 Features 5
2.2 Specifications (Technical data) 5
2.3 Unpacking the heater 6
2.4 General rules to follow for safe operation 8
2.5 Dimensions and minimum
installation clearances 9
3 Installation instructions 10
3.1 Specialized tools 10
3.2 Introduction 10
3.3 Venting 10
3.4 Combustion air requirements 24
3.5 Proper location for installing your heater 25
3.6 Heater placement and clearances 25
3.7 Mounting installation 25
3.8 Gas piping & connections 26
3.9 Water connections 29
3.10 Water quality 29
3.11 Filling the condensate trap 31
3.12 Domestic hot water recirculation 32
3.13 Space heating applications 33
3.14 Measuring gas pressure 35
4 Electrical connections 36
4.1 Electrical power supply 36
4.2 Position of the fuses in control unit 36
5 Operation instructions 37
5.1 Description LCD Display 37
5.2 For your safety read before operating
your water heater 38
5.3 Power 38
5.4 Temperature selection 38
5.5 Use of optional remote control accessory
(part no. TSTAT2) 39
5.6 Operation 39
5.7 Reset button 39
5.8 Program button 40
5.9 Locked condition 40
6 Maintenance and service 41
6.1 Annual maintenance 41
6.2 Winterizing for seasonal use 41
6.3 Mineral scale build-up 42
6.4 Condensing heat exchanger unit 42
6.5 Adjusting CO2 43
6.6 Program values 45
6.7 Control board diagnostics 46
7 Troubleshooting 47
7.1 Introduction 47
7.2 Burner does not ignite when hot
water is turned ON 47
7.3 Water is too hot 47
7.4 Water is not hot enough 47
7.5 Low water flow/pressure 48
7.6 Hot water temperature fluctuates at tap 48
7.7 Noisy burner/heater during operation 48
8 Problem solving 49
8.1 Error code diagnostics 49
9 Electrical diagram 53
10 Sensor resistance charts 54
11 Functional scheme 56
12 Interior components diagram
and parts list 57
12.1 Interior components 57
12.2 Components diagram 59
13 Protecting the environment 66
14 LIFETIME LIMITED WARRANTY
FOR BOSCH PRO TANKLESS
WATER HEATERS 67
15 Notes 69
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