Bosch Water Heaters:
What to Look For

Bosch water heaters are well-known for their quality, reliable engineering, and tankless technology - widely used in residential and commercial water heating applications.

Do you have enough hot water at home?

If not, maybe it is time to switch to tankless, particularly the Bosch brand.

Gas and electric tankless water heaters from Bosch offer a cost-effective solution and endless hot water.

Bosch water heaters: Things to consider

The hot water group is part of the superb heating system within Bosch Thermotechnik GmbH, a leading international manufacturer of gas and electric heating products. Check out the best electric and gas-condensing water heaters.

The most popular Bosch tankless water heaters are powered by natural and propane gas and use condensing technology.

The company also offers small tankless electric models, point-of-use tank-type, and gas boilers for residential and commercial use.

Gas tankless water heaters

Bosch gas tankless water heaterBosch gas tankless

Bosch tankless water heaters do not utilize water storage tanks but heat exchangers to heat water on demand, providing hot water in endless and continuous supply - efficiently.

With the tankless design, there are no more situations like running out of hot water during peak time - when multiple fixtures are used.

Bosch water heaters with tankless design are compact and small, installed on the wall, thus saving your home space for other use and making installation much easier.

As heating takes place only when there is a call for hot water, and due to the ultra-high efficiency (condensing models), tankless heaters can save you a lot of energy and water and have less impact on the environment.

There are two types of the Bosch tankless; the Therm and Greentherm series, which can further be divided into condensing and non-condensing, or ultra-efficiency and high-efficient groups, all built for indoor and outdoor installation.

Bosch Greentherm 9000 series

Bosch 9000 tankless and condensing water heaterBosch 9000 tankless and condensing water heater (photo: bosch)

The best Bosch water heaters come from the condensing group, represented by the Greentherm 9000 series and its seven powerful models.

As these models come with different water flows and high energy efficiencies, they can be used in various applications, from small to large homes. And for those who do not have natural gas, don't worry; they can be converted to propane. Once converted to propane tankless models, they will still deliver a lot of power with an unlimited hot water supply.

Operating with tankless and condensing technology, all the models from the 9000 series will deliver ultra-efficient water heating with UEF up to 0.96, which ensures very low energy waste and great savings.

As opposed to other brands, Greentherm 9000 tankless water heaters are equipped with top water connections, integrated drain ports, and sensor technology with auto calibration, working together to allow easy tank replacement, saving you time and money.

And thanks to the integrated Wi-Fi control and availability of the mobile app, tankless owners can remotely check and control water temperature, usage, heating mode, and diagnostics.

Homeowners will enjoy a 15-year warranty on its main part - the heat exchanger, and 5 years on other components.

Bosch Therm series

Bosch tankless water heaters are available as the mid-efficient Therm 940 ES and 830 ES models, where the former is used for demanding homes and the latter for smaller builds. If the demand for hot water is high, users have the option to use an intelligent cascading system where up to 24 units can be connected into one system and produce much more power and hot water.

Contrary to the Greentherm 9000 series, tankless water heaters from the Bosch Therm series are non-condensing and have "only" 0.82 UEF. Because of that, they are not Energy Star approved but are ultra-low NOx certified, making them environmentally friendly.

While they are designed for indoor use, homeowners can use a vent kit and install it outdoors as well.

The units are equipped with automated and fully modulating bypass to provide a stable and accurate temperature of the outgoing hot water.

All tankless water heaters come with a limited warranty of 15 years on heat exchangers.

Residential electric water heaters

Bosch WH17 electric water heaterBosch WH17

Bosch water heaters are also designed as electric, small tank, and tankless for point-of-use applications and whole-house use, such as the tankless with high power.

If you need a compact and lightweight model for under-sink installation and a single fixture, use an electric tankless water heater from the Tronic 3000 or 4000 series. These are very simple devices with 98% energy efficiency and almost no heat loss.

For the whole-house water heating and more features, homeowners have options to get an electric model from the Tronic 6000 or 6100 series, which has a built-in water filter and thermostatic modulation for a steady temperature output.

Gas boilers

Bosch gas boilers are available as the Greenstar and Buderus condensing and Singular combi boilers.

Greenstar boilers are available in both heat-only and combi versions, and depending on the installation feasibility, they can be installed on the wall or standing on the floor.

Buderus condensing boilers can be connected into the system with up to 8 units making them ideal for use in large homes and commercial builds. They are very powerful units as they come with a heating capacity of up to 300,000 BTU.

Singular combi boilers, with a 10-year warranty and 95% energy efficiency are cost-effective solution for reliable space and water heating in residential applications.

Condensing models are recommended to buy due to their excellent efficiency (over 90%), low operating costs, energy savings, lower pollution, and consistent comfort.

For homeowners who prefer boilers over water heaters, Greenstar boilers are a good choice. The reasons are numerous and include advantages such as compact size, condensing technology, and flexible installation.

These boilers can be installed either on the wall or the floor, including a cascade setup. They offer combined space and potable water heating, superior efficiency, and a limited lifetime warranty on the heat exchanger.

This group carries the reward being the most efficient in 2016.

About Bosch

  • In 1886, Robert Bosch founded the "Workshops for Precision Engineering and Electrical Engineering" in Stuttgart, Germany.
  • In 1906 Bosch established its first US subsidiary, and the Canadian office was opened in Montreal in 1954.
  • Bosch Thermotechnik includes popular brands like Bosch, Buderus, and Junkers. Bosch tankless water heaters have been present on the market for over 60 years.

Bosch is a great company with over 125 years of experience in water heating, of which over 25 years in high efficient condensing heating only. Their water heaters cover different applications and support various systems such as residential, commercial water heating, recirculation system, and solar.

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