Bosch PowerStar AE115 & AE125 Tankless Water Heater

Bosche PowerStar AE115

Bosch's PowerStar series of tankless water heaters are electric water heaters -- no gas connection is necessary. This makes them highly efficient. The AE115 model has an energy efficiency of 90%, while the AE125 has 94% efficiency. They are intended for light residential use, and provide hot water to one outlet at a time,. The AE115 has a maximum flow rate of 2.6 gallons per minute, at a degree rise of 45 degrees Fahrenheit, while the AE125 can provide 4 gpm at the same rise. This means that the AE115 is not ideal for use with bathtubs, although it can handle most other light residential requirements, such as one sink, dishwasher, washing machine, or shower. Temperature is controlled by an external knob, and the PowerStar heaters can deliver water at up to 131 degrees Fahrenheit, although 105-115 degrees is best for efficient performance and flow.

Both units are extremely compact, checking in at 15.2" x 15.5" x 4.2", but can replace a standard 50- or 80-gallon tank heater. This small size means that the PowerStar heaters can be mounted almost anywhere and in any direction.

The AE115 activates with a flow rate of .6 gallons per minute, while the AE125 activates at .8 gpm, so they begin providing hot water quickly after the flow begins and waste less water. Bosch estimates that these heaters will provide a savings of up to $45 annually as compared to standard tank heaters.

The AE115 is not recommended for areas where the average annual ground water temperature is less than 60 degrees Fahrenheit, which in the United States restricts it mostly to the South and Southwest. The AE125 is necessary for cooler climates.

In both models, the heat exchanger is solid copper, with poly heating elements, providing an estimated lifespan of 20 years. Bosch offers a ten-year warranty on the heat exchanger and a one-year warranty on the remainder of the unit.

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