Bosch Tankless Hot Water Heaters Review

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Explore the advantages of Bosch tankless hot water heaters. An expert review of gas and electric Bosch water heaters, including popular series, Therm, Greentherm from gas and Tronic from the electric group, all designed for residential and light commercial on-demand water heating.


As the water heating is the second largest energy user in one household, buying the energy-efficient, or even better – Energy Star unit, is the way to go for the homeowners. And this is where buying a Bosch tankless comes in place. They offer endless hot water on demand, reduce the energy consumption and save on heating costs up to 50%, save on space and reduce the gas emission. And by buying the condensing unit, with the efficiency of over 90%, savings are even greater.

Also, let’s not forget, that the average life expectancy is over 20 years, warranty 15 years, and utilize the innovative technology and advanced electronics that provides stable and accurate temperature and diagnostics.

Bosch is a German manufacturer of HVAC products for residential and commercial applications, from 1886. In North America, you can find several brands in the tankless category, as mentioned above, while in Europe, Bosch tankless hot water heaters are known as Junkers. Popular Aquastar and Powerstar models are discontinued.

When comparing to the old Aquastar and Powerstar, new Greentherm and Therm series are much more advanced, safe, reliable and durable, and with the greater energy savings.

Bosch gas tankless review

Best features

Both Therm and Greentherm group of gas tankless water heaters come with the built-in digital control panel that allows not only monitoring the temperature rise but programming with the precise temperature adjustment and safety control.

Also, thanks to the dual fan, modulating vertical burner and built-in turbulators, the units can operate more efficiently and last longer, due to the reduced scale build-up.

For homes with the high hot water demand, or commercial applications, up to 24 models (some models), either Therm or Greentherm can be linked together in cascades.

Bosch Therm series review

Therm series

Bosch Therm series is the newer line of the advanced condensing and non-condensing tankless water heaters that come with the energy factor that can reach high 98% and very small amount of heat loss (around 2%).

Our focus will be on water heaters for residential use. Most of the models are non-condensing and they come with the power range from 74,900 to 199,000 BTU and efficiency up to 83%, while there are only three condensing models whose power is from 175,000 to 225,000 BTU and thermal efficiency up to 98%. Some models with the reviews are shown in the list below and via the appropriate links.

Therm condensing models are Low NOx and Energy Star approved. In the residential application, they can heat water up to 140 F, while in commercial up to 184 F. The smallest models have only high to low-temperature option.

Bosch Greentherm series review

Bosch Greentherm models are tankless and condensing gas water heaters that are operating with the ultra-high thermal efficiency of over 94% and utilize several innovative features such as the modulating gas valve, active bypass and intelligent electronics for the maximum performance, stability and reliability. All the models, either installed indoor or outdoor are Low NOx and Energy Star compliant.
Due to the lower exhaust gases, Greentherm models are able to use PVC or PP vents, using the concentric setup.

Bosch electric tankless review

Bosch Tronic

Bosch Tronic

Bosch Tronic is the series of the small electric tankless water heaters designed for the whole house and point-of-use applications – mainly smaller homes, apartments, and cottages. 

The largest model provides endless hot water up to 3 major applications. Even designed small and compact, they are powerful and efficient that can be installed virtually anywhere inside the home.

There are three models available, first two are tankless and the last one is tank-type:

  • Tronic 6000/5000 – whole-house and available in three sizes
    Tronic 3000 – under-sink, and available in five sizes
    Tronic 3000T – POU tank type and available in three sizes

Bosch tankless hot water heaters from above, with its advanced features and latest technology, are providing superior water heating, while saving the valuable floor space for other use, lower the energy cost and provide the ultimate comfort with an endless supply of hot water. Due to the tankless design and with the built-in modulation, they ensure the constant temperature and enhanced comfort. Mini tanks on the other side are mainly for point-of-use applications, as they produce a small volume of hot water.

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What Other Visitors Have Said

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Reference:

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