Bosch GWH 715 ES User Manual

GWH 715 ES
INDOOR MODEL
Temperature Modulated with Electronic Ignition
Suitable for heating potable water only - Not approved for space heating purposes
(Intended for variable flow applications)
GWH 715 ES - Natural Gas
GWH 715 ES - Liquefied Petroleum (LP) Gas
6 720 608 158 (2008/12) US
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
vapors 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.

Bosch GWH 715 ES Specifications

General

Ignition Type	Electronic ignition
Safety Features	Overheat protection, flame failure device
Energy Factor	0.82
Thermal Efficiency	82%
Maximum Temperature	140°F
Type	Tankless
Fuel Type	Natural Gas
Dimensions (H x W x D)	600 x 350 x 120 mm
Gas Connection	1/2 inch NPT
Water Connection	1/2 inch

Summary

GWH 715 ES - Introduction

Safety Warnings

Critical safety warnings regarding fire, explosion, and personal injury.

Smell Gas Procedure

Step-by-step instructions on what to do if a gas leak is detected.

1 Warning and Safety

General Safety Precautions

Covers crucial safety advice for installation, operation, and maintenance.

2 Appliance Details

Technical Specifications

2.4 Safe Operation Rules

Essential guidelines for ensuring safe and proper operation of the water heater.

2.5 Installation Clearances

3 Installation Instructions

3.3 Venting Requirements

Key warnings and requirements for proper venting of exhaust gases.

Vent Safety System

Vent Terminal Clearances

Room Sealed Installation (Twin Pipe System)

3.3.4 Fan Speed Adjustment

Procedure for adjusting fan speed based on vent length and altitude for optimal operation.

Adjusting Fan Speeds (P1 & P2)

Step-by-step guide for adjusting minimum (P2) and maximum (P1) fan speeds.

3.4 Combustion Air Requirements

Guidelines for ensuring adequate combustion air supply for safe operation.

3.5 Heater Location

3.6 Placement and Clearances

3.7 Mounting Installation

3.8 Gas Piping and Connections

Detailed steps for connecting the gas supply line to the appliance.

Gas Line Sizing

3.9 Water Connections

Instructions for connecting the hot and cold water supply lines to the heater.

3.12 Measuring Gas Pressure

Procedure for measuring static and operating gas pressure for correct setup.

4 Electrical Connections

4.1 Power Supply

Specifications for the required electrical power supply and grounding.

5 Operation Instructions

5.2 Safety Before Operation

Essential safety checks and procedures to perform before operating the heater.

5.4 Temperature Selection

6 Maintenance and Service

6.1 Annual Maintenance

6.4 Adjusting CO2

Procedure for adjusting CO2 levels for optimal combustion efficiency.

6.6 Control Board Diagnostics

How to access diagnostic modes and interpret error codes for troubleshooting.

7 Troubleshooting

Burner Ignition Issues

Troubleshooting steps for when the burner fails to ignite during operation.

Water Temperature Problems

Diagnosing and resolving issues with water being too hot, not hot enough, or fluctuating.

Low Water Flow/Pressure

Steps to troubleshoot and resolve problems related to low water flow or pressure.

Noisy Burner/Heater

8 Problem Solving

8.1 Error Code Diagnostics

Guide to interpreting error codes displayed on the unit for problem diagnosis.

10 Sensor Resistance Charts

Outlet & Inlet Sensor Characteristics

11 GWH 715 ES Functional Scheme

Operational Logic Flow

14 Limited Warranty

Warranty Terms and Conditions