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Bosch AE125 PowerStar 4 GPM Indoor Electric Tankless Water Heater, Tan | 
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| Brand: Bosch
Category: Home Improvement
Buy New: See price in cart
New (16) Refurbished (1) from $399.95
Rating:  13 reviews
Media: Tools & Hardware
Shipping Weight (lbs): 20
Dimensions (in): 4.3 x 15.3 x 15.5
MPN: AE125
Model: AE125
UPC: 052575701257
EAN: 0052575701257
Availability: Usually ships in 24 hours
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| Features:
| • | Electric tankless water heater; for climates with annual groundwater temperature below 60 degrees Fahrenheit | | • | Provides 4 gallons of hot water per minute; average energy-efficiency rating of 94 | | • | Includes solid-copper heat exchanger | | • | Includes one water heater | | • | 15-1/2 by 15-1/4 by 4-1/2 inches; 22 pounds; 10-year limited warranty on heat exchanger; 1-year on parts |
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| Customer Reviews: Read 8 more reviews...
 Not worth the trouble November 20, 2008
R. Peltier (Tempe, Arizona)
We purchased and installed the Model AE125 in November 2006 based on the Bosch name and its 10 year warranty for the heater elements. The unit failed earlier this week and despite assurances in the description that the outlet temperature is controlled, scalding water came out of the shower, burned me, and then the unit shutdown. Reseting the thermal overload only produced more scalding water for a minute and then another trip. Attempts to contact Bosch meant long phone waits and trying to use the email to contact support on their website have proven useless. Bottom line: we're very disappointed in Bosch and their failure to live up to their warranty claims and their design of a product that is downright dangerous when it fails. It's coming off the wall this weekend and going straight into the trash can. I would rather replace it with an energy efficient water heater from Lowes with a lifetime warranty than deal with these guys any more. Take it from me, save yourself money, time, and aggravation and stick with a reputable manufacturer of an Energy Star water heater than buy a Bosch t(h)ankless system.
 Bosch AE-125 October 27, 2008
A. Anderson (California)
1 out of 1 found this review helpful
This is fine if you have room in your circuit box for 3 separate 40 amp twin pole breakers because it requires 120 amps to operate. Most people have only 100 amp service to their house and if they do have 200 amp service rarely do they have a spare 120 amps. It must be wired with #8 wire.This is for one fixture at a time and no more. There is very little that can be serviced on this and if it comes to that, it must be replaced. Water quality must be pristine because the hall effect switch is susceptible to fouling and is not replaceable. Power surges during storms are the death knoll of these. It has a rheostat type temp control you must bend down to see. Its easy to install but you have to purge the air out before starting or you will burn one or more of the three heating elements out. the older version was very crude and the heaters looked home made, the new plastic ones are an improvement. Take it from a former Bosch Authorized Service Rep do your homework carefully. Plumbers do not generally have the electrical background to work on these and Bosch does not publish the electrical values needed to test for performance. Even the most adept technician is going to be confused as to where to test if the heaters have failed and there is even less hope for the homeowner. Close but no cigar...
Not for homes on a well September 16, 2008
William S. Burt Jr. (Port Orchard, WA USA)
4 out of 4 found this review helpful
I purchased the Bosch AE125 Electric Tankless Water Heater 4 months ago and have regretted it. Several considerations should be taken.
First the unit is not an analogue to a conventional tank-type water heater. It delivers hot water based upon a system that measures the incoming water temperature and flow rate and then "calculates" the number of elements (it actually has 6) that it turns on to provide an outflow temperature based on the setting of the temperature control. This system is not satisfactory for a water supply which varies in pressure, SUCH AS A WELL, as the unit itself provides substantial resistance to flow and thus the flow rate through the unit varies and thus the temperature of the outgoing water. This causes the delivered water to vary widely in temperature, from VERY HOT to VERY COLD. The unit would be improved if it was "smart enough" to not only measure incoming temp, but, also, outgoing temperature and flow rate and maintain the outgoing temp at a constant level.
Second: The unit has a flow sensor, which will shut the heaters off at low flow, so, therefore, if you wish to have a small amount of hot water flowing into your sink for shaving purposes, the water will not be heated at all. This "Feature" also has considerable influence on the use of "low flow" faucets.
Third: If you have a home which is heated by electricity and you install this unit, be aware that it consumes 120 AMPS at maximum heat rate. In my case, my electric heat consumes 120 Amps, also; my home has a 200AMP panel. Do the math, turn on the heat to warm the house and then take a bath, and suddenly the entire house is plunged into darkness. I have decided that I must sense when the water heater is turned on and prevent the central heat from coming on. This should be doable, and since the unit only runs when hot water is required, should disable the central heat only for short periods. HOWEVER, this is a feature that should be provided by Bosch and/or their literature should make clear to the potential purchaser that this is a problem with the electric heater.
Fourth: The unit apparently switches one or more of its six elements on or off as it attempts to heat the water. There does not appear to be any partially on for any of the elements. This leads to the problem of "stepped" heating of the water. And because the unit measures flow in and calculates the outgoing rate, if the water is mildly too hot or too cold, simply changing the mix at the faucet does not necessarily result in mild changes in temperature, a tiny change at the faucet can cause one or all of the elements to switch off resulting in a dramatic change at the faucet. AGAIN an argument for sensing the outgoing temperature and maintaining it by modulating the elements for a smoother temperature curve.
I would rate this unit as unsatisfactory for any home with a well, and only marginally acceptable for any home with electric heat (but only if modified as I indicated above).
Had I known then, what I know now, I would have saved myself a lot of money and frustration by purchasing a conventional tank-type water heater.
 Bosch AE125 September 6, 2008
clocker1
3 out of 4 found this review helpful
I bought online and installed it myself using compression fittings - very easy to do. Total cost $650, total time about 1/2 a day. I live in northern VA (it's very important to know ground water temperature with smaller units) and can get 2 showers+ in the summer. In the winter 1 shower + 1 faucet. There is a little fluctuation in temperature in the winter, but I think this can be corrected with the hot water valve now that I know what's going on. Electric is actually cheaper than gas in our area, so this was a good choice. Monthly savings appear to be about 19 percent. Made one service call and got a quick answer.
WORTHLESS water heater March 5, 2008
J. Miller
8 out of 10 found this review helpful
I would rate the unit at a negative 100.
One of the worst items I purchased. Water would fluctuate, be too hot to stand on the lowest settings. This was installed by professionals in a new house. I got several error codes. Finally had enough and called tech support. I was on the phone 2 hours the first time I called and that was on hold. Then I spent another hour playing games with the unit.
We spent over 10 hours talking to tech support over a month's period. I had to switch the unit on and off to get a bath. Tech support said the supplier told me the wrong unit to buy. Another tech support told me that that was wrong. I had to take off a lot of time to get the gas and plumbing installers to come back and check their work which was correct.
Finally I had enough and called the supplier. They worked with me to get me a credit. By the way that supplier no longer sells Bosch. Just give me your money instead of buy the Bosch unit. I can hand deliver consistent and dependable hot water better than Bosch. Oh yeah and you can get a straight answer from me without the long wait. Maybe the long wait shows that there are a lot of consumers that are having the same problems.
Replaced with Rinnia and it works as designed.
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