Bosch 125B LP Installation And Operating Instructions Manual
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Bosch 125B LP Installation And Operating Instructions Manual

Automatic instantaneous type water heaters for use with natural and liquefied petroleum gas
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I NSTALLATION AND OPERATI NG I NSTR UCTIONS FOR AUTOMATIC
INSTANTANEOUS TYPE WATER HEATERS FOR USE WITH NATURAL AND
LIQUEFIED PETROLEUM GAS
MODEL 125B LP and 125B NG (Flow Modulated)
Intended for variable flow applications with steady cold water inlet temperatures only
WARNING
: 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.
Upon completion of the installation, these instructions
should be handed to the user of the appliance for future
reference.
In the Commonwealth of Massachusetts this product
must be installed by a licensed plumber or gas fitter.
Suitable for heating potable water only
Not approved for space heating purposes
WARNING
If the information in this manual is not followed exactly, a
fire or explosion may result causing property damage,
personal injury or death.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable,
combustible or corrosive vapors and liquids in the vicinity
of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
- 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.

TABLE OF CONTENTS

Specifications ....................................... Page 2
Rules for safe operation ..................... Page 4
Locating the Heater ............................ Page 4
Combustion Air Requirements .......... Page 5
Mounting the Heater ........................... Page 6
Venting the Heater .............................. Page 7
Gas Connections .............................. Page 10
Water Connections ........................... Page 12
Lighting instructions .......................... Page 13
Setting water temperature ............... Page 13
Trouble Shooting ................................ Page 14
Diagram of AquaStar ........................ Page 19
Components and Parts List ............ Page 20
Warranty ............................................. Page 22

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Dmitriy Borovskiy
February 12, 2025

im looking parts for bosch aquastar model 125b lp 8708500251

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1 comments:
Mr. Anderson
February 12, 2025

Replacement parts for the Bosch Aquastar 125B LP can be obtained from BBT North America, Bosch Group, located at Mad River Park, Waitsfield, VT 05673. You can contact them by phone at 800-642-3111 or fax at (802) 496-6924.

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Summary of Contents for Bosch 125B LP

  • Page 1: Table Of Contents

    I NSTALLATION AND OPERATI NG I NSTR UCTIONS FOR AUTOMATIC INSTANTANEOUS TYPE WATER HEATERS FOR USE WITH NATURAL AND LIQUEFIED PETROLEUM GAS MODEL 125B LP and 125B NG (Flow Modulated) Suitable for heating potable water only Not approved for space heating purposes...

  • Page 2: Specifications

    This well engineered, gas water heater has all the fea- AquaStar 125B LP and 125B NG Specifications tures a water heater should have: It operates on the principle of heating water instantaneously “on demand”. When a hot water faucet is opened, cold water Gas Input max.: 117,000 Btu/hr...
  • Page 3 FRONT VIEW SIDE VIEW MINIMUM INSTALLATION CLEARANCES FROM COMBUSTIBLE AND NON COMBUSTIBLE MATERIALS FOR ALCOVE OR CLOSET INSTALLATIONS MODEL 125B TOP (A) 12 " FRONT (B) 4 " BACK 0 " SIDES 4 " FLOOR (C) 12 " VENT DIAMETER 5 "...

  • Page 4: Rules For Safe Operation

    GENERAL RULES TO FOLLOW PROPER LOCATION FOR INSTALLING YOUR FOR SAFE OPERATION HEATER Carefully select the location of your new heater. For your 1. You should follow these instructions when you install your safety and for proper heater operation, you must provide an heater.

  • Page 5: Combustion Air Requirements

    Air Vents 125B (10 ¾ X 10 ¾ in. each) Fig. 1 - Water heater drain plug WARNING: Flammable materials, gasoline, Air Vents 125B pressurized containers, or any other items or articles (5 ½ X 5 ½ in. each) that are potentially fire hazards must NOT be placed on or adjacent to the heater.

  • Page 6: Mounting The Heater

    Note: Typically, the minimum clearence to combustible The incandescent particle tray (shipped loose in the carton “ with the water heater) must be attached at the bottom of materials should not be less than 6 for single wall flue the water heater front cover at the time of installation. Use pipe.

  • Page 7: Venting The Heater

    VENTING Vent pipe connection. WARNING: Do not reduce the vent pipe size. See Fig. 4 for high altitude installations The heater must be vented to the outside following all local ordinances and specifications for installing a gas appliance vent or chimney. The heater must be located as close as practicable to a vertically rising chimney or vent that has a listed vent cap at its termination point.
  • Page 8 : Masonry chimneys shall be built and installed in accordance with NFPS 211 or local codes. A minimum MASONRY CHIMNEY 5” diameter gas vent pipe (metal double wall Type B), or an approved clay flue liner or a listed chimney lining system must be used when venting into a naturally drafting, internal masonry chimney.
  • Page 9 To check the draft: Close all doors and windows to the outside. Turn on all appliances that force air out of the building. These include all exhaust/ventilation fans, furnaces, clothes 5” X 6” ADAPTOR dryers, wood burning stoves, etc. USED ON HIGH ALTITUDE Open all doors between the AquaStar and these other appliances.

  • Page 10: Gas Connections

    GAS LINE SIZING GAS CONNECTIONS -It is strongly recommended that the Natural Gas pipe be Black Iron pipe the entire distance from the outside meter to the inlet of the Aquastar regulator. 1/2” Black NOTE: The Aquastar 125 B is supplied with a gas pressure Iron pipe up to 10 feet, 3/4”...
  • Page 11 GAS PIPING, CONNECTIONS and Gas Regulator Before connecting the gas supply, check the rating plate on the right side of the front cover to be sure that the heater is rated for the same gas to which it will be connected. 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.

  • Page 12: Water Connections

    WATER CONNECTIONS Install the heater centrally in the building if possible and make hot water piping runs as short as possible When facing the heater, the cold water inlet will be on the right and the hot water outlet on the left.. Although water piping throughout the building may be other than copper, copper or galvanized piping should be used when connecting to the heaters ½”...

  • Page 13: Lighting Instructions

    LIGHTING INSTRUCTIONS (as seen on front cover of heater) GAS CONTROL SLIDE 1. STOP! Read the safety information above on this plate. 2. The Gas valve must be turned off by sliding the gas valve button to the far left under the OFF ( ) mark.

  • Page 14: Trouble Shooting

    Water Valve (Part # 8707002649): The water valve on this heater should be serviced periodically. Lubricate component #23 on page 19 with a small amount of silicon, faucet or lithium grease every two years to keep its o rings AIR SCREEN fresh and pushrod sliding smoothly.
  • Page 15 PILOT LIGHT WILL NOT LIGHT 3. Poor thermocouple connection at the electromagnet Note: Electromagnet is part #8707201012 located on the 1. No gas to the AquaStar right side of the gas valve behind the piezo push-button A. Gas cock on gas line may not be open. assembly.
  • Page 16 5. Crossover in household plumbing WATER IS TOO HOT The AquaStar burner activates when there is sufficient water 1. Temperature Selection too high pressure drop in the AquaStar water valve assembly — i.e. Position the gas control slide to the single flame ( when a hot water faucet is opened.
  • Page 17 HOT WATER TEMPERATURE FLUCTUATES / UNIT DEACTIVATED 1. Unbalanced pressure in waterlines The added restriction caused by the Aquastar in the hot water system can result in uneven pressures between the cold and the hot. In such cases when mixing cold water at the tap, the lower hot water pressure may be overpowered by the higher cold water pressure in the building, which may cause the Aquastar burners to shut down (deactivate).
  • Page 18 6 720 607 030...

  • Page 19: Diagram Of Aquastar

    Diagram of AquaStar 125 B Fig. 12 - 6720606800-07.1AL Heat exchanger Gas control slide Pilot assembly Piezo igniter Burner manifold gas Water valve pressure test nipple Temperature adjustment Main gas burner selector Pilot gas tubing Gas inlet gas pressure test Gas valve nipple Pressure tap screw...

  • Page 20: Components And Parts List

    - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST Fig. 13 6 720 607 030...
  • Page 21 Fig. 13 INTERIOR COMPONENTS DIAGRAM AND PARTS LIST 125B Cover 8 705 421 025 Temperature adjustment knob 8 702 000 111 Temperature adjustment collar 8 700 403 008 Draft diverter 8 705 505 354 Heat exchanger 8 705 406 235 Outlet flex hose 8 700 703 130 Washer...

  • Page 22: Warranty

    Aquastar water heaters are warranted by the Manufacturer This warranty does not cover any labor costs associated (BOSCH) through BBT North America. BBT North America with service, removal or re-installation of part(s). All such (BBTNA) will furnish a replacement heat exchanger and will costs must be borne by the Purchaser.
  • Page 23 - Flow chart of Aquastar 125 B Fig. 14 6 720 607 030...
  • Page 24 † † † Replacement Parts available from: BBT NORTH AMERICA Bosch Group VULCANO Termodomésticos S.A. Bosch Water Heating Estrada de Cacia 340 Mad River Park 3801 - 856 Aveiro - PORTUGAL Waitsfield, VT 05673 Phone 800-642-3111 Fax (802) 496-6924 www.boschhotwater.com techsupport@boschhotwater.com...

This manual is also suitable for:

125b ng

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