Question about Bosch PowerStar AE125 AE125 Whole House Electric Tankless Water Heater...

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How many wires does it take to wire a bosch ae125 tankless water heater

Do i need two seperate wires ae two seperate 8-3 wires

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  • Bosch Master
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You need three #8 wires for AE125. Two #8 wires for AE115.

1) Copy following link for wiring information:http://waterheatertimer.org/How-to-wire-Tankless-electric-water-heater.html

2) The AE125 has 3 elements, and requires 3 wires.Each wire is sized #8 copper, and is connected to 40 amp breaker, up to 100 feet. Over 100 feet, use 50 amp breaker and #6 wire. Oversizing breaker and wire is smarted and more efficient than undersizing.

3) Often a separate subpanel is installed to provide 3 extra spaces.

http://waterheatertimer.org/images/Main-subpanel-Tankless-600.jpg


4) Makes sure main breaker panel can accept additional 120 amps of draw without overampping panel ... and starving other appliances of full power.... that will damage appliances, overheat motors, and damage main panel and overheat main breaker. You want to oversize, not undersize electric service when installing tankless electric, which is why I do not recommend tankless electric installation, including issues of costing more to operate, and expensive repairs, and general money risk-nuisance of owning tankless vrs tank-type heater.
http://waterheatertimer.org/Troubleshoot-household-electricity.html#stress

Posted on Dec 06, 2012

  • 3 more comments 
  • Dallas Dec 06, 2012

    Gene the diagram to the panel shows one black wire black wire going to

  • Dallas Dec 06, 2012

    Gene the wiring diagram shows one black wire going to L2 and a gray one going to L1 the gray wire kinda looks like a ghost wire. on the terminal in the panel has wires coming from both L 1 and L2 do I need a wire coming from my breaker box to both L1 and L2

  • Gene Haynes Dec 06, 2012

    I want you to open each link I send, so we both have same illustration. You need one wire for L1 and one wire for L2. I'm not sure how much you know... so let's start at the basics first, and run a 240Volt line from breaker box. Each 240Volt circuit has 2 wires, and these are labeled L1 and L2, and these 2 wires come from a double circuit breaker.http://waterheatertimer.org/images/Insid...

  • Gene Haynes Dec 06, 2012

    Read above first. Open the links I send. Next. You need 3 separate circuit breakers for AE125.http://waterheatertimer.org/images/Insid...

  • Gene Haynes Dec 06, 2012

    Let me know where you are so far, and if the illustrations clarify L1 and L2.

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Posted on Jan 02, 2017

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freetek
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SOURCE: bosch ae125-re tankless water heaters

My experience in Germany with tankless water heaters was not good; the delivery promised was only vaguely warmed water; they are no replacement for standard devices.
If you can find closet or under-counter (in the kitchen) space you might look into the 20 gallon units made for RVs or small mobile homes/campers. They are not expensive to run and cost well below the ~ $400 US price I saw when looking at the Bosch. If you are worried about the efficiency of them or concerned with the cost of electricity in your area, you could have an electrician install a high-capacity (15-20 Amp) toggle switch (looks like a normal light switch) and manually turn it off completely when it is unused for a longer period of time.
In any case, before you jump on the Bosch bandwagon, check the degree (or lack) of satisfaction from current owners:
http://www.amazon.com/review/product/B0006GVO0S/ref=dp_top_cm_cr_acr_txt?_encoding=UTF8&showViewpoints=1
I wouldn't be encouraged to buy that one.   

Posted on Sep 18, 2008

SOURCE: I need to know the breaker size and wire gauge and

According to the user manual below, it's a 50 amp heater, therefore, you need 6 AWG electrical cable and a 50 amp double pole (220 volt) breaker in the main service panel.

You need two hot wires and a ground wire. The cable would be specified as 6/2 w/ ground. The 2 hot wires in the cable would be red & black or black & black -- these attach to L1 & L2 respectively. ( L = Line )

More info, let me know.

Charlie

http://ecx.images-amazon.com/images/I/A1b%2BxE2vITS.pdf

Posted on Oct 04, 2009

SOURCE: my bosch tankless water heater is flashing ae

Before calling service technician, open following links for Bosch error codes, and contact information, and possible product manual for your model, etc:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://waterheatertimer.org/pdf/Bosch_EA_error_code_troubleshooting.pdf
http://waterheatertimer.org/pdf/Bosch-GWH2400ES-error-codes.pdf
http://waterheatertimer.org/pdf/Bosch_A4-E4_error_code_troubleshooting.pdf

Error code AE is not shown, but error EA means "burner flame not recognized by control unit when water is flowing"

There is also error A3 and A3 E3: jumper connection is not correct

Posted on Sep 26, 2011

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1 Answer

Leaking tank


Replace heater?
Do not install tankless.
Call for service?
Manual does not show troubleshoot or repairs
Bosch site does not show the AE125 series water heater any longer
http://waterheatertimer.org/pdf/Bosch-AE115-AE125_manual.pdf

Gene

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AE 125 Just Stopped Working Altogether,,,Still Has Power But No Light Or Hot Water?


Turn circuit breakers fully off and then back on.
Use nose to smell for burning inside main panel.
Make sure you are getting 240Volt and not just 120V from one leg of the breaker.
Do stress test on breaker panel.
http://waterheatertimer.org/Troubleshoot-household-electricity.html#stress

Least expensive solution: Replace tankless computer for $285 buying tank-type electric water heater from local box store.

If tankless computer is new, then call installer.
If you installed it yourself, call professional installer.
http://waterheatertimer.org/How-to-wire-Tankless-electric-water-heater.html

Gene
h

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Failed Bosch AE125


Contact Bosch 800-283-3787, or service technician.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Product has 10 year limited warranty against defects in workmanship, failed parts, failed heat exchanger for original homeowner with receipt. But does not cover neglect, failure to follow maintenance, installation etc. Pg 23 example manual
You generally have to pay for service call to verify installation, then send tankless into factory, or have service technician repair unit, at your expense minus cost of parts
http://waterheatertimer.org/pdf/Bosch-AE115-AE125_manual.pdf

To double check wiring:
http://waterheatertimer.org/How-to-wire-Tankless-electric-water-heater.html

Sep 29, 2012 | Bosch PowerStar AE125 AE125 Whole House...

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We need to replace the 6 way terminal on our Powerstar A125 tankless hot water heater due to a loose wire that got hot and melted the terminal at the end. How do you do this. We have the part to rep


What happened to the screws from the old terminal strip?
If it is a different size you need to drill new small holes in the box (not the tank or pipes) and attach it with self tapping screws. Make sure each wire of the unit matches the same wire being connected as the original connections.

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Wiring hook up


Here is a location for a help manual
http://www.houseneeds.com/shop/manuals/ae115125_manual.pdf
lol

Dec 04, 2011 | Bosch PowerStar AE125 AE125 Whole House...

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I have a Power Star electric hot water heater, model AE 125, serial # 39-203967, model 45-55130. purchased 5 years ago at Home Depot for $850.00. I love the heater when it works. This is the second time I...


Bosch has 10-year limited warranty.
Probably the seller honors warranty first 90 days and Bosch afterward.

I think warranty is similar to car warranty where parts are covered, and they pay for parts to patch up the blown transmission but not give you a new car. But I hear of cases where the company just send a whole new Tankless unit and you install it yourself.

Contact Home Depot and present them with receipt.
Contact Bosch with the same information given in Fixya question.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Add a comment and say why unit broke down first time, and add what resolution was reached to help others with same question.

Upvote the help.
And 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.

Jun 02, 2011 | Bosch PowerStar AE125...

1 Answer

I need to know the breaker size and wire gauge and number of wires needed for a bosch ae125 water heater


According to the user manual below, it's a 50 amp heater, therefore, you need 6 AWG electrical cable and a 50 amp double pole (220 volt) breaker in the main service panel.

You need two hot wires and a ground wire. The cable would be specified as 6/2 w/ ground. The 2 hot wires in the cable would be red & black or black & black -- these attach to L1 & L2 respectively. ( L = Line )

More info, let me know.

Charlie

http://ecx.images-amazon.com/images/I/A1b%2BxE2vITS.pdf

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1 Answer

Need tanks for bosch ae-125 water heater


good luck,, there aren't that many whole house electric tankless units of any kind even made

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