Bosch GWH 425 PN Specifications download pdf (Page 4)

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Appliance details

2.2 Unpacking the GWH 425 PN heater

This heater is packed securely.

Before installing the unit, be certain you have the

correct heater for your type of Gas - Propane or

Natural Gas. Identification labels are found on the

shipping box, and on the rating plate which is located on

the right side panel of the cover.

Fig. 2 Rating plate

A Serial number

B Type of gas

The box includes:

• Pressure relief valve

• Mounting screws

• Product registration card

• Installation manual

• Incandescent particle tray.

Do not lose this manual, there is a charge for a

replacement.

Please complete and return the enclosed product

registration card.

The GWH 425 PN is not approved or designed for:

• Manufactured (mobile) homes, RV's or boats

• Heating or other recirculating/pumping applications*

• Solar/preheat backup or high temperature booster

use

• Installation in a bathroom.

* This includes domestic hot water circulator pump loop

systems that may be installed in home hot water system

prior to installing this unit. An approved recirculation

design can be found in chapter 3.10. Contact BBTNA

if further instruction is needed.

2.3 General rules to follow for safe

operation

1. You should follow these instructions when you install

your heater. In the United States: The installation must

conform with local codes or, in the absence of local

codes, the National Fuel Gas Code ANSI Z223.1/

NFPA 54.

In Canada: The Installation should conform with CGA

B149.(1,2) INSTALLATION CODES and /or local

installation codes.

2. Carefully plan where you install the heater. Proper

clearances must be followed.

3. The appliance must be isolated from the gas supply

piping system by closing its individual manual gas

shutoff valve (not supplied with heater) during any

pressure testing at pressures in excess of ½ Psig (3.5

kPa).

The appliance and its gas connection must be leak

tested before placing the appliance in operation.

4. Keep water heater area clear and free from

combustibles and flammable liquids. Do not locate the

heater over any material which might burn.

5. Correct gas pressure is critical for the optimum

operation of this heater. Gas piping must be sized to

provide the required pressure at the maximum output of

the heater, while all the other gas appliances are in

operation. Check with your local gas supplier, and see

the chapter 3.7 and 3.8 to verify proper gas line sizing.

6. Should overheating occur or the gas supply fail to

shut off, turn off the gas supply at the manual gas shut

off valve, on the gas line. Note: manual gas shutoff valve

is not supplied with the heater.

7. Do not use this appliance if any part has been

underwater. Immediately call a qualified service

technician to inspect the appliance and to replace any

part of the control system and any gas control which

has been underwater.

BOSCH is constantly improving its

products, therefore specifications are

subject to change without prior notice.

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Bosch GWH 425 PN Specifications Page 4

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