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Bosch GWH-425-HN-L User Manual

Bosch GWH-425-HN-L
28 pages
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Water heaters for use with Natural and L.P.G.
GWH 425 HN
Flow Modulated with Hydro-generated 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
6 720 608 036 US (2007.05) 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.
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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Bosch GWH-425-HN-L Specifications

General IconGeneral
TypeTankless
Fuel TypeNatural Gas
Maximum Flow Rate4.2 GPM
Energy Factor0.82
VentingDirect Vent
Dimensions27.5 x 14.2 x 8.7 inches
Weight37.5 lbs
Gas TypeNatural Gas
Flow Rate4.2 GPM
Ignition TypeElectronic
Warranty12-Year Limited on Heat Exchanger

Summary

Appliance Details

General Rules for Safe Operation

Outlines crucial safety guidelines for installation and operation, including local code compliance and handling gas.

Installation Instructions

Mounting Heater

Provides instructions and warnings for mounting the heater, including using support boards and L-shaped hooks.

Combustion Air Requirements

Explains the necessity of adequate combustion air for safe and proper operation, detailing requirements for confined and unconfined spaces.

Venting Requirements

Details critical venting requirements to prevent dangerous exhaust gases, including pipe size and elbow placement.

Gas Piping & Connections

Provides essential information on connecting gas supply lines, including regulator installation and leak testing.

Operation Instructions

Safety Before Operation

Emphasizes reading safety instructions before operation and outlines steps to take if gas is smelled.

Lighting Instructions

Details the step-by-step procedure for safely lighting the water heater and its pilot burner.

Maintenance and Service

Troubleshooting

No Spark at Pilot with Water Flow

Provides a systematic guide to diagnose and resolve issues where there is no spark at the pilot.

Spark Appears, But Pilot/Burners Do Not Ignite

Offers troubleshooting steps for when a spark is present but ignition fails for the pilot and burners.

Pilot Light On, Burners Not Igniting

Guides on troubleshooting when the pilot light is on, but the main burners fail to ignite.

Main Burners Go Out During Hot Water Use

Addresses issues where the main burners shut off unexpectedly during hot water usage.

Hot Water Temperature Fluctuates

Helps diagnose and fix fluctuating hot water temperatures at the tap.

Water is Too Hot

Provides steps to troubleshoot and resolve instances where the water temperature is excessively high.

Water is Not Hot Enough

Guides on troubleshooting and resolving issues where the water temperature is insufficient.

Fifteen Year Limited Warranty

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