Bosch Model GWH 425 - Manual
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Table of Contents:
- Page 2 – Index; The heater must be isolated
- Page 3 – Appliance details; specifications; Approved in US/Canada
- Page 4 – Unpacking the GWH 425 PN; Rating plate; is not approved or designed for:; General rules to follow for safe; Correct gas pressure
- Page 5 – Dimensions and installation clearances; Minimum clearances
- Page 6 – Installation instructions; Introduction; DO NOT INSTALL IN AN
- Page 7 – Mounting Heater; Remove cover and inspect.; Incandescent particle tray illustration
- Page 8 – Combustion air requirements; An unconfined space is one whose volume is greater; Appliances located in confined spaces:; • 4000 Btu/hr if all air is taken from the outside by
- Page 9 – Venting; Horizontal venting; Flat roof
- Page 10 – Fig. 12 Masonry chimney; Table 2
- Page 11 – Gas piping & connections; Fig. 13 Installation of Gas Pressure Regulator; Note; GAS LINE SIZING; Altitude; Table 3 Above 4.500 ft consult your local gas provider
- Page 12 – FOR NATURAL GAS
- Page 13 – Measuring gas pressure; Connecting manometer; Static pressure test; Water connections; Connecting the pressure relief valve (PRV)
- Page 14 – Recirculation application; Fig. 17 Recirculation application; Operation instructions; For your safety read before; WHAT TO DO IF YOU SMELL GAS; existence of air in the gas supply
- Page 15 – Lighting instructions; To turn off appliance
- Page 16 – Setting the water temperature; Temperature adjustment knob; Draining water from heater; If there is a risk of freezing, proceed as follows:; Clockwise; Degree rise
- Page 17 – Maintenance and service; Maintenance intervals; Failure
- Page 18 – Main burners; Descaling heat exchanger
- Page 19 – Troubleshooting; with
- Page 20 – Burners do not light with water
- Page 21 – heat
- Page 22 – yellow flames when operating
- Page 23 – Protecting the environment; Packing
- Page 24 – Interior components and diagram parts list; Interior components; Fig. 28 Functional scheme
- Page 25 – Components diagram; Fig. 29 Components Diagram
- Page 26 – Parts list; Item; Table 5
- Page 27 – Fifteen Year Limited Warranty
- Page 28 – BBT; NORTH AMERICA
GWH 425 PN
INDOOR MODEL
Flow Modulated with Standing pilot
Suitable for heating potable water only - Not approved for space heating purposes
(Intended for variable flow applications with steady cold water inlet temperatures)
GWH-425-PN-N
GWH-425-PN-L
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Warning:
If the information in this manual is not
followed exactly, a fire or explosion may result
causing property damage, personal injury or death.
Do not store or use gasoline or other flammable
vapor and liquids in the vicinity of this or any other
appliance.
Improper installation, adjustment, alteration,
service or maintenance can cause injury or
property damage. Refer to this manual. For
assistance or additional information consult a
qualified installer, service agency or the gas
supplier.
In the Commonwealth of Massachusetts this
product must be installed by a licensed plumber or
gas fitter.
Upon completion of the installation, these
instructions should be handed to the user of the
appliance for future reference.
What to do if you smell gas
• Close gas valve. Open windows.
• Do not try to light any appliance
• Do not touch any electrical switch; do not use any
phone in your building.
• Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire
department.
• Installation and service must be performed by a
qualified installer, service agency or the gas supplier.
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About this manual
- Brand
- Bosch
- Model
- Model GWH 425
- Document type
- Manual
- Language(s)
- English
- Pages
- 28
- Format
Summary
6 720 608 034 2 Index Index 1 Warning 2 2 Appliance details 3 2.1 GWH 425 PN specifications (Technical data) 3 2.2 Unpacking the GWH 425 PN heater 4 2.3 General rules to follow for safe operation 4 2.4 Dimensions and installation clearances 5 3 Installation instructions 6 3.1 Introduction 6 3.2 Prop...
6 720 608 034 Appliance details 3 2 Appliance details 2.1 GWH 425 PN specifications (Technical data) Approved in US/Canada Capacity GWH 425 PN: 4.3 GPM Maximum output GWH 425 PN: 91 525 Btu/hr Maximum input GWH 425 PN: 117 000 Btu/hr Efficiency in % Recovery efficiency 78% Min. Output GWH 425 PN: 23...
6 720 608 034 4 Appliance details 2.2 Unpacking the GWH 425 PN heater This heater is packed securely. Before installing the unit, be certain you have thecorrect heater for your type of Gas - Propane orNatural Gas. Identification labels are found on the shipping box, and on the rating plate which is ...
