Model # AE-12

Internet #100019685

PowerStar 12 kW 240-Volt 2.0 GPM Point-of-Use Tankless Electric Water Heater

Discontinued PowerStar

12 kW 240-Volt 2.0 GPM Point-of-Use Tankless Electric Water Heater

  • Can support hand washing and very low flow showers
  • Consult electrician and/or plumber; requires 1 x 50-240 volts
  • Same-day installation in most areas. Call 1-855-400-2552 by noon.
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Frequently Bought Together

Product Overview

The Bosch/PowerStar 12 kW tankless water heater is a point-of-use water heater that helps eliminate long waits for hot water. Ideal for isolated sink locations in a home, office, warehouse, or service station. A copper heat exchanger, 98% efficiency, and the ability to heat only the water you use mean that you save water, energy, and money. Units are compact with flexible installation configurations.

  • Provides a continuous supply of hot water for one sink at a time
  • Eliminates long wait for hot water
  • Small product footprint fits in tight spaces
  • Flexible installation - mounts on wall or under sink
  • Solid copper heat exchanger
  • Overheating protection for your safety
  • UL listed for safety
  • 98% efficient
  • Must be hard-wired
  • Must be mounted lengthwise
  • Requires 1 double pole 50 Amp
  • See models AE3.4 kW, AE7.2 kW and AE9.5 kW for lesser AMP needed (point-of-use)
  • 1/2 in. water connections
  • Easy to use thermostat provides water at desired temperature
  • Click here to check out our buying guide on water heaters
  • Click here for more information on Electronic Recycling Programs

Info & Guides

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Product Depth (in.)
Product Height (in.)
Product Width (in.)
Water Connection Size (in.)


Amperage (amps)
Application Type
Point of Use
Electric Product Type
Point of Use
Finish Family
Flow Rate @ 35 F Rise (gallons/min)
Flow Rate @ 45 F Rise (gallons/min)
Flow Rate @ 55 F Rise (gallons/min)
Flow Rate @ 65 F Rise (gallons/min)
Fuel Type
Maximum Temperature (F)
Minimum Activation Rate (gpm)
Minimum Temperature (F)
Product Weight (lb.)
Water Connection Location
Water Heater Features
Wall Mountable
Wattage (watts)

Warranty / Certifications

Certifications and Listings
1-UL Listed,CSA Listed
Labor Warranty
No Warranty
Part Warranty
1 Year

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Customer Questions & Answers

will the 12kw 240 vol heat the water for my jacuzzi tub

Asked by: noquarles
it will, but you don't need it to do that because jacuzzis come s with they own water heaters
Answered by: Fernando
Date published: 2017-01-06

so will the power star AE 12 work in place of the AE 9.5 unit?

Asked by: Poppens
As long as you have the extra amperes it will use (approx 50 amps), you should be fine.
Answered by: Hotwater
Date published: 2015-11-08

We have natural spring water which is cold and the most hot water usage at one time would be a washer load of clothes or a bathtub full.

Plus both sinks, washer, and bathtub are within in 15-20 ft of each other, so with this and cold spring water would these work for us?
Asked by: Homesteader
no. it needs a normal to a slow flow to give it time to heat up the water. overloading its capacity, water passes to fast and not enough time for heating, witch causes it to trip its internal safety overload due to too many cycles of trying to keep up wit hot water
Answered by: Fernando
Date published: 2017-01-06

Could you use this to heat the water for a dishwasher? Would there be enough hot water to get the dishes clean?

Asked by: Dave
yes it could, but also dishwashers comes with water heaters. i know for fact as an electrician.
Answered by: Fernando
Date published: 2017-01-06
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Customer Reviews

12 kW 240-Volt 2.0 GPM Point-of-Use Tankless Electric Water Heater is rated 4.1 out of 5 by 44.
Rated 5 out of 5 by from LOVE IT!!! I bought this unit for a whole house water heater... My house uses one wet wall so I bought this unit to replace a leaking water tank... easy to instal and it works great!!! endless hot showers are very nice... I have already recommended this product to four others including my dad! I'm not disappointed with this as it does exactly what it says it can do, I do recommend that you read the product info before you buy and buy the right size for what you need... as for my little home, (three bedroom one bath 1400 square feet), the 12KW unit is perfect! I'm now building a towel closet in the space the old hot water tank use to occupy...
Date published: 2011-02-06
Rated 4 out of 5 by from Good product!! Bought this unit to replace a leaking standard water heater. Though the product description states only for a single point use, this will supply plenty of hot water for a whole house as long as you only use one point at a time. Works great in my shower and never run out of hot water. Not so good taking a shower and someone using sink. But as long as there is only one thing using hot water it is great. Have not seen my next power bill yet to see the savings but I am sure it will be noticable. Fairly straight forward to install with a little common sense, biggest thing is getting the correct wire to install with. Kind of expensive, but is better to do it right the first time than have any problems later. Buy 6-2 wire as this unit only uses two leads and a ground. I plan on buying a couple more later on to place in my kitchen and other bathroom or maybe a whole house unit, but either way I am very pleased with the functionality of this product.
Date published: 2011-06-13
Rated 4 out of 5 by from OK one bathroom water heater This water heater works pretty good for one bathroom in the south (East Texas) with a low flow shower head. It takes a little time to get used to how to adjust the temperature at the faucet. The installation of the new wiring was difficult. But, the small size has given us a whole new closet that the old water heater was stored in. Also, since we use this just for our guest bath, we no longer have to flip the breaker when people visit to turn on and off the heater. All and all, a good product especially considering the price. When our main water heater breaks, we plan to replace it with the "whole house" version of this water heater.
Date published: 2009-09-26
Rated 4 out of 5 by from Needs a hexagonal 'tightening holder' for the threads, so that the heating pipe doesn't flex as compression fittings go on. This unit is light years ahead of the old tankless water heating systems. A single heating element makes for enough hot water quickly, and it looks robust. We'll see how it stands the test of time, but for now it works great. The pipe fittings could have been engineered better, as tightening the compression fittings will flex the innards a little as it gets installed.
Date published: 2012-06-12
Rated 5 out of 5 by from GREAT if you understand how it works These save a LOT of $ only heat when needed. Should be VERY close to where used. Thermostat helps to give regulated temp after a few sec to minute. First cold, very hot then averages out. We are in FL, coldest H20 is about 69 to 70 degrees. Used for Shower and sink. Installed aprox Feb 2011. Have had other units from this co. They stand behind the warranty and have exelent Tech help. The warranty used to be 5yrs, now it is 2 & 5 IE parts 2 and heater unit 5. Thier website says 1 & 5yrs. so prob changing. The 2/5 was indicated by Home depot.
Date published: 2011-02-19
Rated 5 out of 5 by from Great performance! The AE12 is a great product and performs great within his specifications. It increases my 1gpm cold water flow from about 65F to 120F in seconds. It now allows us to have hot water at every use over 9ft piping instead of the original 80ft of piping witch was not able to provide instant hot water for specific kitchen needs. It is very small and easily fits under your kitchen sink. The installation is simple but the challenge is to bring a wire #6/2 (50-60 amps) to get the maximum power from the AE12. I paid about $150 for the 6/2 wire and breaker. I probably $200 for the installation by doing myself but took 5-6 hours to go from the electrical box to the kitchen in the center of the house. Along with the challenge of the wire installation, there are others considerations. First, the unit has a very thin/weak temperature knob. On my first order, it came broken (it took about 20 days to send back the unit and get the refund). This knob is really weak and you have to be careful not to break it when removing/installing the unit cover. When the cover is installed the knob is safe and can be turn has needed. Second, the temperature controller does start with a burst of heat and stabilize few second later. So, its tends to send about 10 seconds of very hotter water than requested then finally adjust the desired temperature. This is a programming/designing issue according to me. I would accept a delay of few second not get that hot water than almost burn your hands. But like everything else you get use to it and modify you old habit. Third, before to buy, evaluate your needs and current specifications like cold water temperature, desire hot water temperature, water flow (gpm), ease and cost of passing the required electrical wire and room to add a 60 amps breaker in your electrical box. It is suggested to look for product specifications and read the online installation manual before to buy. Overall I like the unit it performs to meet our need. I would buy again! The initial cost is high but confident that I will save at every use now on the lost of hot water of the long original piping.
Date published: 2009-01-27
Rated 1 out of 5 by from Not exactly the deal it looked like. Within one month of installation, the board fried because of a direct short in one of the elements. Called the maker and they agreed to replace it after seeing pictures of the fried board. Paid overnight shipping so I wouldn't have to wait for up to two weeks and installed the replacement the next day. Almost six months to the day, the replacement started only giving out a luke warm water supply. Ran some checks and found that two of the elements had no resistance. The elements appear to be the weak point of these heaters.
Date published: 2015-01-31
Rated 5 out of 5 by from I bought this Item about 3 years ago. I wasn't sure if it was gonna work for me or it was gonna l... I bought this Item about 3 years ago. I wasn't sure if it was gonna work for me or it was gonna last this long. about 3 years or so ago, when my actual boiler died I had no hot water and no heat here in North east, Rhode island, in a plain cold winter. I managed to hook up my HVAC unit to gas for heat and this one for hot water temporarily, with intention of returning it after getting a hot water tank or new boiler. NEVER DID. it worked so well without problems and I forgot about it, and it still going with hot water for the whole house ( a single family raised ranch, 2 people, 1 1/2 bath 2 kitchens) at normal use. i don't see a need of getting a different source of hot water yet, until its done. I totally underestimated it. if this one goes, definitely will get another one.
Date published: 2017-01-06
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