Specifications

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Index
Index
1 Warning 2
2 Appliance details 4
2.1 Features 4
2.2 GWH-425-HNO specifications (Technical data) 4
2.3 Unpacking the GWH-425-HNO heater 5
2.4 General rules to follow for safe operation 5
2.5 Dimensions and installation clearances 6
3 Installation instructions 7
3.1 Introduction 7
3.2 Proper location for installing your heater 7
3.3 Heater placement and clearances 8
3.4 Mounting installation 8
3.5 Gas piping & connections 10
3.6 Measuring gas pressure 12
3.7 Water connections 12
3.8 Electrical connections 13
4 Operation instructions 14
4.1 For your safety read before operating your water
heater 14
4.2 Lighting instructions 14
4.3 To turn off appliance 14
4.4 Setting the water temperature 14
4.5 Electrical diagram 16
5 Maintenance and service 17
5.1 Maintenance intervals 17
5.2 Water valve 17
5.3 Pilot 17
5.4 Main burners 17
5.5 Vent assembly 17
5.6 Mineral scale build-up 17
6 Troubleshooting 18
6.1 Introduction 18
6.2 Pilot will not light 18
6.3 Pilot lights but the burners will not come on 18
6.4 Hot water temp fluctuates from hot to cold 18
6.5 Water is too hot 19
6.6 Water is not hot enough 19
7 Interior components diagram and parts list 20
7.1 Interior components 20
7.2 Components diagram 21
7.3 Parts list 22
8 Protecting the environment 23
9 Fifteen Year Limited Warranty 24
1 Warning
For your safety
Do not store or use gasoline or other flammable,
combustible or corrosive vapors and liquids in the
vicinity of this or any other appliance.
Warning: If the information in this
manual is not followed exactly, a fire or
explosion may result causing property
damage, personal injury or death.
Warning: 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.
Upon completion of the installation,
these instructions should be handed to
the user of the appliance for future
reference.
Warning: Carefully plan where you
install the heater. If a gas appliance is
not installed correctly, fatal accidents
can result from lack of air, carbon
monoxide poisoning or fire.
Warning: Place the heater in a location
where water leaks will do NO DAMAGE
to adjacent areas.