Bosch Model GWH 425 User Manual (English)

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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

6 720 608 034 US (06.05) 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 Model GWH 425 Specifications

General

Type	Tankless
Energy Factor	0.82
Thermal Efficiency	82%
Ignition Type	Electronic
Venting	Direct Vent
Gas Connection	1/2 inch NPT
Fuel Type	Natural Gas
Energy Efficiency	82%

Summary

Warning

Appliance details

GWH 425 PN specifications (Technical data)

Technical specifications including capacity, output, input, efficiency, gas requirements, dimensions, gas types, safety devices, and water resistance.