Bosch ProTankless GWH-425-PN-N Manuals

Table of Contents

• • 2

    Table of Contents

• 3

  2 Appliance Details

• 3

  1Warning

  • 4

    Unpacking the GWH 425 PN Heater
  • 4

    General Rules to Follow for Safe Operation
  • 5

    Dimensions and Installation Clearances
  • 6

    Heater Placement and Clearances
  • 7

    Mounting Heater
  • 8

    Combustion Air Requirements
  • 9

    Venting
  • 11

    Gas Piping & Connections
  • 13

    Measuring Gas Pressure
  • 13

    Water Connections
  • 14

    Recirculation Application

• 14

  4 Operation Instructions

  • 14

    For Your Safety Read before Operating Your Water Heater
  • 15

    Lighting Instructions
  • 15

    To Turn Off Appliance
  • 16

    Setting the Water Temperature
  • 16

    Draining Water From Heater
  • 17

    Water Valve
  • 17

    Inspecting Pilot

• 17

  5 Maintenance and Service

  • 17

    Maintenance Intervals
  • 18

    Main Burners
  • 18

    Vent Assembly
  • 18

    Mineral Scale Build-Up

• 19

  6 Troubleshooting

• 19

  3Installation Instructions

  • 19

    Introduction
  • 19

    Pilot Does Not Light
  • 19

    Pilot Lights, but Goes Out When Button Is Released
  • 20

    Burners Do Not Light with Water Flow
  • 20

    Hot Water Temperature Fluctuates at Tap
  • 21

    Water Is Too Hot
  • 21

    Water Is Not Hot Enough
  • 21

    Burners Ignite Without Hot Water Flow
  • 21

    Low Hot Water Pressure
  • 21

    Noise When Heater Is Running
    • 22

      When Operating

• 23

  7 Protecting the Environment

• 24

  8 Interior Components and Diagram Parts List

  • 25

    Components Diagram
  • 26

    Parts List

• 27

  9 Fifteen Year Limited Warranty