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

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

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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

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I have a bosch ae115tankless waterheater - the neon light will flash when turned on but when i reset the breaker it will work? any ideas/


Flashing light means bad control unit..or your flow is too low. If you have a couple fixtures on, and its still blinking, the board needs to be replaced.

Dec 01, 2013 | Bosch PowerStar AE125 AE125 Whole House...

1 Answer

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
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Sep 24, 2013 | Bosch PowerStar AE125 AE125 Whole House...

1 Answer

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


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

Dec 06, 2012 | Bosch PowerStar AE125 AE125 Whole House...

1 Answer

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...

1 Answer

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.

Jan 27, 2012 | Bosch PowerStar AE125 AE125 Whole House...

1 Answer

The water is not hot


Has it ever been? Check the circuit breakers in the house and connections to the unit. Adjust thermostat up and down a bit in case it has stuck. Also an AC voltmeter and skill is needed to carefully check voltages in the terminal box to locate loss of voltage to heater elements, safety thermostats, or open heating coils. LOL

Jan 05, 2012 | Bosch PowerStar AE125 AE125 Whole House...

1 Answer

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...

1 Answer

When i am taking a bath or a shower somtimes it kicks my breaker what would cause this and how do i fix it


Does the panel box have the proper size breaker for this unit.Iwould start with checking that before any thing else. hope this works

Jan 23, 2011 | Bosch PowerStar AE125 AE125 Whole House...

1 Answer

Heater is ae125 is about 2.5 years old no problem until now turned on water and but no hot water light or anything checked breakers,checked cutouts,plenty of flow,still no hot water


Hey did you ever get this fixed mine is almost the exact same thing we've been using ours for about 3 years and today nothing. Thanks for your help.

Dec 07, 2010 | Bosch PowerStar AE125 AE125 Whole House...

1 Answer

PowerStar 125 not heating.


turn the temp to it;s lowest setting and isolate it from the other unit till it fires up, let me know if this doesn't work,, gary1121@ao.com

Jun 07, 2009 | Bosch PowerStar AE125 AE125 Whole House...

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