Question about Bosch AquaStar Propane Tankless Water Heater #125HX-LP

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Which Bosch Tankless water heater replaces the AQ-125-X LP

Old AQ-125-X needs to be replaced, this model not made anymore, what model replaces it?

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  • Grant McQueen Jan 04, 2013

    Which Bosch current model, and/or any other brand of tankless water heater is equal too the model stated above that is no longer manufactured?

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3 Suggested Answers

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Posted on Jan 02, 2017

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gary1121
  • 332 Answers

SOURCE: Looking for Outdoor Tankless propane water heaters

it will tell you right on the box if it for indoors or out doors either way they have to have a cover over them,,

Posted on Jun 09, 2009

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SOURCE: aq 125 blp Bosch tankless water heater, pilot

Natural Gas: Pilot burner or orfice may need to be cleaned. Pg 11 manual.
http://www.boschhotwater.com/Portals/7/TechManuals/125BL_English.pdf
Most tank and tankless gas water heaters today suggest annual cleaning and maintenance of burner.

Open following links for Bosch troubleshooting resources:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/125BLTechSupport/Troubleshoot/tabid/474/Default.aspx

Posted on Jun 14, 2011

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Is this a water heater? Bosch site might have manual. And service bulletins, but I have not heard of that model.
http://www.bosch-climate.us/Bosch-Hot-Water/
Call local service technician who is qualified to work on tankless computer that heats water.
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http://waterheatertimer.org/pdf/Bosch-125BO-NG-LP-outdoor.pdf
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I have a Bosch AquaStar AQ-125-BNG tankless water heater, and for some reason when it is heating the water, it seems to get exremely hot and the heat is radiated back into the cold water supply line and...


Tankless should never be installed with plastic pipe, PVC or CPVC etc.

Before calling service technician, open following link for Bosch tankless troubleshooting resources, including Bosch contact information, typical manuals, error codes, tech support, parts, fuel-saver calculator, service bulletins, water heater forum, fixya links, disclaimers, and links for finding service technician.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Read manual cover to cover, make sure tankless receives yearly maintenance as outline in manual.

Add a comment with your experience so others with same-similar problem can benefit.

Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Apr 02, 2011 | Bosch AquaStar Indoor Natural Gas Tankless...

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Our Bosch model AQ 125 Bong water heater pilot light will not stay on. We've tried numerous times. The instruction suggest a service technician. There are none available in our area. What the best...


It sounds to me like your thermocouple is bad . See if you can trace it from the gas valve to pilot light. Remove thermocouple and try to get a exact replacement part. If the length varies don't worry about that. Install new thermocouple and see if that doesn't solve your problem. Thanks

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Jul 05, 2010 | Bosch AquaStar Indoor Natural Gas Tankless...

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Looking for Outdoor Tankless propane water heaters


it will tell you right on the box if it for indoors or out doors either way they have to have a cover over them,,

Jun 09, 2009 | Bosch AquaStar Propane Tankless Water...

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