Question about Bosch AquaStar Indoor Natural Gas Tankless Water Heater with Vent Hood #125

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Is there alot of problems with bosch aquastar 2400

Installing this system. Just wanting to know the history of this model

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  • ccdm4ever Mar 10, 2009

    Even if you got a softner in ther too

  • ccdm4ever Mar 10, 2009

    this has city water also

  • Thomas F. Schneider May 11, 2010

    Watching this website as well as my personal experience with tankless water heater their seems to be a lot of problems with all of them, especially if you have hard water.

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Bosch has had problems with these heaters for sure. They are the best known thing out there in the market.They are mostly responsible for the bad rap being given to all tankless heaters, but a big part of the problem is installation. They are being sold to homeowners at box stores as DIY kits. These are not units to be homeowner installed, venting and fuel requirements are different from regular heaters and they will not function correctly if improperly installed. I have installed several of the Rannai units over the past few years without any issue whatsoever.

Posted on Mar 16, 2009

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My aqua star Bosch sings when it is making hot water

Posted on Apr 19, 2009

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I have a bosch gwh 2400 es ng and when i program the temp. it resets back to 100 degrees


Before calling service technician, open following link to download typical manual, get Bosch contact information etc.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

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.

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1 Answer

My bosch aquastar 2400 shuts off sometimes during a shower


It sounds like you have a well. Make sure the water pressure does not dip below 30PSI. Otherwise, the gas pipe or the CO2 levels need to be adjusted by a qualified gas technician.

Apr 11, 2010 | Bosch AquaStar 2400ES-NG

1 Answer

Error codes re: fan speed fan very noisy


I was looking for a service manual, which you apparently do not supply. I was not looking for someone who will charge me a fee to get information. I can get that info directly from Bosch for free. Thank you for answering. John

Feb 04, 2010 | Bosch AquaStar Indoor Natural Gas Tankless...

1 Answer

Bosch Aquastar 2400E LP Does Not Heat Water


Sounds like the water flow sensor and servo, may just need cleaning, get it checked out by a Bosch agent

Nov 10, 2009 | Bosch AquaStar 2400ES-NG

1 Answer

Recently installed a Bosch 2700ES. I am getting


unplug power or turn off power,reboot, and try again

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1 Answer

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...

1 Answer

Bosch 2400 exhaust adapter doesn't fit the stainless flue pipe correctly. Stainless flue per manual spec.


depending on the unit and the exhust pipe you might have what they call the condensate catcher in wich it has to be piped diffrently,, you will need to cut the end if you read the instuctions it will tell you to cut the outer cover 1/2 inch shorter then the stainless pipe, cutting off the hubb this will make it fit,, make sure to cut it straight so it will seal properly

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