Bosch Tankless Water Heater

Reviews of Powerstar and Aquastar tankless models

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Bosch tankless water heater article features model reviews of the best selling Bosch on demand water heaters; electric Powerstar and gas fired Aquastar models.

German manufacturer Bosch and its perfectly engineered water heating systems gives you a variety of high quality tankless models with very simple tasks; to provide you with an instant and endless supply of hot water for your home.

And not only that, in these small and compact Bosch heaters there is potential to save you up to 50 % of the energy bill, while producing enough hot water for your shower, bathtub or kitchen.

When browsing for Bosch tankless water heater models you will also find them with a popular brand name Aquastar for gas tankless and Powerstar for electrical water heaters.

Several Bosch tankless water heater models meet the requirement for Energy Star recognition where the Energy Factor is 0.82 or higher. That means you can apply for government tax credit and available rebates.

For example: Bosch Aquastar models range from 80-87% efficiency with energy factors, EF, ranging from 0.69 to 0.86. Read further to see which Bosch models are high efficiency.

Bosch tankless water heater is a space saving home appliance, with a nice, white painted design. An average life expectancy for Bosch tankless is 20 years. Bosch provides 12-year warranty on heat exchanger and 2 on parts.

All the Bosch water heaters 125FX, 2700 and 2400 series are using an electronic ignition, no gas wasting through the constantly burning pilot light.

Note: Some Bosch Aquastar models are approved for elevations up to 8000 ft (2.7 km), so depends where you live, you should determine which model is the best for you.

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Natural gas and LP models

From the Bosch Aquastar series, which are using either natural gas or propane, here are the available models and their main characteristics:

BOSCH tankless water heater - Aquastar 2700ESbosch tankless water heater aquastar

  • Ideal for 2-3 bathrooms home with 7 GPM of hot water

  • 2700ES is an Eco friendly model with 50 % savings on your utility cost

  • Direct vent room-sealed combustion

  • Power input 19.900-199.000 BTU

  • Energy Star qualified

  • Energy Factor 0.82


BOSCH tankless hot water heater - Aquastar 2400ESbosch 2400es aquastar

  • Supplies two showers simultaneously with 6 GPM of hot water

  • 50 % savings on your energy cost

  • Direct vent room-sealed combustion

  • Power input 19.900-175.000 BTU

  • Energy Star qualified

  • Energy Factor 0.82


BOSCH tankless water heater - Aquastar 2400Ebosch aquastar 2400e

  • Delivers up to 6 gallons per minute hot water

  • Able to support two showers simultaneously

  • Save up to 50% on utility costs

  • Direct vent room-sealed combustion

  • Power input for natural gas 35.000-175.000 BTU (LP 31.000-175.000)

  • Energy Factor 0.80


BOSCH - Aquastar 2400EObosch aquastar 2400eo.jpg

  • Outdoor installation

  • Delivers up to 6 gallons per minute of hot water

  • Able to support two showers simultaneously

  • No venting required

  • Includes freeze protection down to 5°F

  • Power input for natural gas 35.000-175.000 BTU (LP 31.000-175.000)

  • Energy Factor 0.80


BOSCH Aquastar 1600Pbosch 1600p aquastar

  • Ideal for one bathroom home and smaller families

  • Delivers up to 4.3 gallons per minute of instant hot water

  • Standing pilot light

  • No electricity required

  • Natural draft venting with power vent upgrade available

  • Power input 30.375-117.000 BTU

  • Energy Factor 0.69, EF for LP 0.79


BOSCH tankless water heater - Aquastar 1600Hbosch 1600h aquastar

  • Ideal for one bathroom home and smaller families

  • Delivers up to 4.3 gallons per minute instant hot water

  • Hydro-generated ignition system with no pilot light, electricity and batteries

  • Natural draft venting with power vent upgrade available

  • Power input 30.375-117.000 BTU

  • Energy Factor 0.80


BOSCH Aquastar 1600PSbosch 1600ps aquastar

  • Specially designed as a backup for solar water heating

  • Great for one bathroom home and smaller families

  • Delivers up to 4.3 gallons per minute of instant hot water

  • A small unit ideal for cottages and camps

  • Perfect for point-of-use applications such as an outdoor shower or remote sink

  • Power input 23.400-117.000 BTU

  • Energy Factor 0.69, EF for LP 0.79


BOSCH Aquastar 125BObosch 125bo aquastar

  • Operates one shower at a time

  • Outdoor installation

  • Delivers up to 4.3 gallons per minute hot water

  • No venting required

  • Standing pilot light

  • Includes freeze protection down to 5°F

  • Power input 28.000-117.000 BTU

  • Energy Factor 0.69, EF for LP 0.79


BOSCH Aquastar 125FXbosch aquastar 125fx

  • Great for one bathroom home and smaller families

  • Delivers up to 4.6 gallons per minute instant hot water

  • Electronic ignition

  • Power vented for horizontal venting installations

  • Power input 28.000-130.000 BTU

  • Energy Factor 0.78, EF for LP 0.81


BOSCH tankless water heater Aquastar 1000Pbosch 1000p aquastar

  • Low volume heating (perfect for cottages and camps)

  • Standing pilot

  • Power input 30.735-74.900 BTU

  • Energy Factor 0.64

Electric models

bosch powerstar tankless water heater

Powerstar is the popular point-of-use electric tankless water heater model from Bosch. There are four Powerstar under-sink models that can be used in your kitchen and bathroom. They are: AE3.4 (3.4kW), AE7.2 (7.2kW), AE9.5 (9.5) and AE12 (12kW).

Two main differences between them are hot water flow rates and the temperature. All these models are 99% efficient and Bosch provides 5-year warranty on heat exchanger and 1-year on replacement parts.

bosch ae115 powerstar

If planning to use electricity for instant heating, and you need it for the whole house, then Bosch Powerstar tankless water heaters AE115 and AE125 are ideal, and especially if your old 40 gallon tank type water heater has to be replaced.

Note: Powerstar supplies hot water for the whole house, but they cannot run two major water applications at the same time, like a washing machine, shower or bathtub. Model AE115 is not recommended in climates where the average ground temperature of water is less than 60 F.

Powerstar AE115 has the Energy factor 0.90 with 17.25 kW, and AE125 0.94 with 26.85 kW.

The main features of these two Bosch tankless water heater models are 10-year warranty on heat exchanger, thermal cut-out for safety, less than 25 pounds in weight, electronic flow switch and flow sensor for constant output temperature.



(Pictures courtesy of Bosch)

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