Bosch GWH 425 HN User Manual
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Water heaters for use with Natural and L.P.G.
GWH 425 HN
Flow Modulated with Electronic Ignition
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-HN-N
GWH-425-HN-L
6 720 607 026 US (04.11) AL
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
• If you cannot reach your gas supplier, call the fire
department.
• Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
• Installation and service must be performed by a
qualified installer, service agency or the gas supplier.
- GWH 425 HN 1
- FOR YOUR SAFETY 2
- WHAT TO DO IF YOU SMELL GAS 2
- TABLE OF CONTENTS 2
- FEATURES 3
- ½” Thread fitting NPT 3
- UNPACKING THE 425 HN HEATER 3
- MODEL 425HN 4
- GENERAL RULES TO FOLLOW 5
- FOR SAFE OPERATION 5
- COMBUSTION AIR REQUIREMENTS 6
- CLEARANCES 6
- “ for single wall flue 6
- MOUNTING I N STALLATION 6
- MINIMUM 6 FEET (1.8M) 7
- MASONRY CHIMNEYS 8
- GAS CONNECTIONS 9
- FOR NATURAL GAS 10
- GAS LINE SIZING 10
- FOR LP GAS 10
- WATER CONNECTIONS 11
- SETTING THE WATER TEMPERATURE 12
- PILOT ORIFICE 13
- NO SPARK AT THE PILOT 14
- 156 720 607 026 15
- 16 6 720 607 026 16
- Diagram of 425 HN 17
- 18 6 720 607 026 18
- INTERIOR COMPONENTS DIAGRAM 19
- AND PARTS LIST 425 HN 19
- - Flow chart of 425 HN 20
- 216 720 607 026 21
- 22 6 720 607 026 22
- 236 720 607 026 23
- 31egapeesELBATECNANETNIAM 24
Summary of Contents
Page 1 - GWH 425 HN
Water heaters for use with Natural and L.P.G.GWH 425 HNFlow Modulated with Electronic IgnitionSuitable for heating potable water only - Not approved f
Page 2 - TABLE OF CONTENTS
10 6 720 607 026NominalIron Pipe Black Iron PipeSize, Length of Pipe, FeetInches 10 20 30 40 50 60 70 80 90 100 125 1501/2 275 189 152 129 114 103 96
Page 3 - UNPACKING THE 425 HN HEATER
116 720 607 026OPERATING INSTRUCTIONSBefore proceeding with the operation of the heater makesure that the system is filled with water.Open the cold wa
Page 4 - MODEL 425HN
12 6 720 607 026The position you select on the temperature adjustment knobwill depend on the temperature of the incoming water (50°Fis average in the
Page 5 - FOR SAFE OPERATION
136 720 607 026Fig. 10 - Characteristic Pilot Flame(Pilot assembly shown without pilot hood)MAINTENANCE AND SERVICEREVIEW MAINTENANCE TABLE ON THE BAC
Page 6 - MOUNTING I N STALLATION
14 6 720 607 026Problems are stated in upper case, bold face. Most commoncauses for the problems follow in order of likelihood. Thesuggested solutions
Page 7 - MINIMUM 6 FEET (1.8M)
156 720 607 026Fig. 13 - Electrical wiring diagram5. Flue gas safety device trippedVentilate the room and operate the appliance 10 minuteslater. Provi
Page 8 - MASONRY CHIMNEYS
16 6 720 607 026HOT WATER TEMPERATURE FLUCTUATES / UNITDEACTIVATED1. Unbalanced pressure in waterlinesThe added restriction caused by the 425
Page 9 - GAS CONNECTIONS
176 720 607 026Fig. 14 - Diagram of 425 HN1. Heat exchanger2. Pilot assembly3. Burner manifold gaspressure test nipple4. Main gas burner5. Pilot gas t
Page 10 - FOR LP GAS
18 6 720 607 026Fig. 15 - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST
Page 11 - WATER CONNECTIONS
196 720 607 026Fig. 15INTERIOR COMPONENTS DIAGRAMAND PARTS LIST 425 HN1 Cover 8 705 421 7522 Temperature adjustment knob 8 702 000 1113 Temperature ad
Page 12 - SETTING THE WATER TEMPERATURE
2 6 720 607 026WARNING: Improper installation,adjustment, alteration, service or maintenance can causeinjury or property damage. Refer to this
Page 13 - PILOT ORIFICE
20 6 720 607 026Fig. 16 - Flow chart of 425 HN
Page 14 - NO SPARK AT THE PILOT
216 720 607 026Service Labor CostsThis warranty does not cover any labor costs associatedwith service, removal or re-installation of part(s). All su
Page 15 - 156 720 607 026
22 6 720 607 026
Page 16 - 16 6 720 607 026
236 720 607 026
Page 17 - Diagram of 425 HN
VULCANO Termodomésticos S.A.Estrada de Cacia3801 - 856 Aveiro - PORTUGALRecycled paper© 2004 Controlled Energy Corporation, Waitsfield, VT all rightsr
Page 18 - 18 6 720 607 026
36 720 607 026Principle of Operation:When a hot water faucet is opened, the water flow throughthe heater causes the gas valve to open. At the same tim
Page 19 - AND PARTS LIST 425 HN
4 6 720 607 026MINIMUM INSTALLATION CLEARANCES FROM COMBUSTIBLE AND NONCOMBUSTIBLE MATERIALS FOR ALCOVE OR CLOSET INSTALLATIONSFRONT VIEW SIDE VIEWMOD
Page 20 - - Flow chart of 425 HN
56 720 607 026GENERAL RULES TO FOLLOWFOR SAFE OPERATION1. You should follow these instructions when you install yourheater. In the United States: The
Page 21 - 216 720 607 026
6 6 720 607 026WARNING: Flammable materials, gasoline,pressurized containers, or any other items or articlesthat are potentially fire hazards
Page 22 - 22 6 720 607 026
76 720 607 026VENTINGVent pipe connection.WARNING: Do not reduce the vent pipe size. See Fig. 4for high altitude installationsThe heater must be vente
Page 23 - 236 720 607 026
8 6 720 607 026To check the draft:Close all doors and windows to the outside.Turn on all appliances that force air out of the building.These include
Page 24 - 31egapeesELBATECNANETNIAM
96 720 607 026GAS CONNECTIONS NOTE: The 425 HN is supplied with a gas pressureregulator that must be installed on the heater beforeatt
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