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Bosch WR8 series - User Manual

Bosch WR8 series
12 pages
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6 720 607 884 (2009/05) GB
WR8..P...
WR11..P...
With piezo ignition and double safety system
consisting of flue gas monitor and heat
exchanger temperature sensor.
Safety instructions:
If you smell gas:
- Do not operate any electrical switches.
- Do not telephone from inside the danger area.
- Turn off the gas cock.
- Open windows and ventilate room.
- From outside, call the gas company and your approved
installer.
Do not use or store easily combustible materials in the vicinity
of the appliance.
Gas Instantaneous Water Heater
Installation Manual and Operating Instructions
Installation and servicing of the appliance may only be
carried out by an approved technician.
The appliance should be regularly serviced in order to ensure
that it remains in perfect and safe working order.
If there is a risk of freezing, the appliance must be switched
off and drained. If the appliance has not been drained during
a cold spell, when it is switched on again check that it
produces hot water. If problems occur, contact your installer

Questions and Answers

  • M
    Mrs. Tamara RitterJul 27, 2025
    What to do if flame goes out on Bosch WR8?
    • M
      Michael ClayJul 27, 2025
      If the flame on your Bosch Water Heater goes out during operation, it could be that the flue gas safety device or the temperature limiter has tripped. To resolve this, ventilate the room, wait 10 minutes, and then restart the appliance. If the problem continues, it is recommended to call an approved technician.
  • D
    David Phillips Jr.Aug 1, 2025
    Why is Bosch Water Heater water not hot enough and the flame is weak?
    • E
      Emily Hernandez MDAug 2, 2025
      If your Bosch Water Heater isn't producing hot enough water and the flame is weak, the gas supply dynamic pressure might be too low. Inspect the gas cylinder governor and replace it if it's incompatible or damaged. Also, check if the gas cylinder (butane) is freezing during operation and, if needed, move it to a warmer location.
  • V
    Valerie JohnstonAug 7, 2025
    How to fix reduced water flow rate in Bosch Water Heater?
    • B
      blake84Aug 7, 2025
      If you're experiencing a reduced water flow rate with your Bosch Water Heater, several factors could be the cause. It might be due to an inadequate inlet flow rate, so check and adjust it. There could be dirt in the water service cock or mixer unit, requiring a check and clean. The automatic water valve might be clogged, in which case you should clean the filter. Lastly, the heat exchanger could be clogged with scale, so clean and descale it as necessary.
  • J
    Jacob WillisAug 14, 2025
    How to make Bosch Water Heater water hotter?
    • K
      karaperryAug 14, 2025
      If the water from your Bosch Water Heater is not hot enough, check the output selector position and adjust it according to your needs.
  • W
    William LoveAug 20, 2025
    Why is the pilot flame yellow on my Bosch WR8?
    • T
      Tyler EstradaAug 20, 2025
      If the pilot flame of your Bosch Water Heater has a yellow flame and remains alight, and it takes several attempts to turn it on, the pilot burner may be blocked. Clean the pilot burner.

Summary

Safety Instructions

Gas Leak Safety Procedure

Follow immediate steps if you detect a gas leak, including turning off gas and ventilating.

Combustible Materials Warning

Avoid storing flammable materials near the water heater to prevent fire hazards.

Technical Characteristics and Dimensions

Appliance Category and Approval

Details the appliance's category, type, and relevant approval numbers for compliance.

General Appliance Description

Provides an overview of the water heater's features and safety systems.

Model Code Explanation

Deciphers the meaning of each part of the appliance's model number.

Appliance Dimensions

Detailed measurements and physical specifications of the water heater.

Appliance Component Layout

Diagram and labels identifying the various internal components of the appliance.

Detailed Technical Specifications

Comprehensive technical data including output, pressure, consumption, and water system specs.

Preconditions for installation

Installation Regulations Compliance

Ensures compliance with gas safety regulations and standards for installation.

Appliance Location Requirements

Specifies suitable placement for the water heater, considering ventilation and temperature.

Appliance Mounting and Installation

Instructions for securely mounting the water heater vertically.

Water Supply Connection

Guidance on connecting water pipes, including draining and non-return valves.

Gas Supply Connection

Steps for connecting the gas supply, ensuring correct gas type and pipe diameter.

Flue Pipe Installation

Requirements for installing a gas-tight flue pipe for safe exhaust gas removal.

Commissioning and Leak Checks

Procedure for initial setup, checking gas/water connections and safety devices.

Operation and maintenance

Appliance Function and Ignition

Explains the piezo ignition system and how the main burner operates.

Water Temperature Adjustment

How to set and adjust the desired water temperature and flow rate.

Factory Settings and Adjustments

Information on factory settings and conditions for LPG and natural gas appliances.

Scheduled Maintenance and Servicing

Guidance on regular servicing, recommended intervals, and replacement parts.

Appliance Draining for Freezing Risk

Procedure to drain the appliance to prevent damage from freezing.

Flue Gas Safety Device Operation

Explains the function of the flue gas safety device and its importance.

Gas Type Conversion Procedure

Instructions for converting the appliance to a different type of gas.

Troubleshooting Common Problems

Solutions for common operational issues like pilot flame, heating, and flow rate problems.

Operation

Ignition Procedure

Step-by-step guide on how to ignite the pilot flame and main burner.

Output Adjustment Guide

Instructions on how to control and adjust the heat output of the appliance.

Temperature Control Mechanism

Explains how to adjust the water temperature by modifying flow rate.

Appliance Shut-off Procedure

Steps for safely turning off the water heater.

Bosch WR8 series Specifications

General IconGeneral
MaterialCopper heat exchanger
TypeTankless
Fuel TypeNatural Gas
IgnitionElectronic Ignition
Safety FeaturesFlame failure protection, Overheat protection

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