Bosch Thermotechnik GmbH

Bosch Thermotechnik GmbH

The Bosch Thermotechnology division is responsible for all activities involving heating technology and hot-water solutions. The division has a number of major international and regional thermotechnology brands and supplies people with state-of-the-art technologies worldwide. In times of scarce energy resources, the topic of efficient heat generation is of existential importance. Innovations from Bosch Thermotechnology have been setting trends for centuries. Bosch Thermotechnology offers its customers throughout the world solutions for their room climate, domestic hot water and decentralised energy management requirements. Highly efficient technologies which also in many cases use renewable energies and make a significant contribution to implementing the energy transition. Bosch Thermotechnology uses its comprehensive know-how – whether in terms of condensing technology, solar thermal systems, heat pumps or combined-heat-and-power – to reduce CO² emissions.

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Sophienstrasse 30-32 , Wetzlar , 35576 Germany
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Globally (various continents)
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We are the future of Thermotechnology.

We provide our customers with simply revolutionary solutions for a pleasant indoor climate, hot water supply, and industrial steam generation and energy conversion.

Our fascinating products improve the quality of life all over the world.

History of Bosch Thermotechnology

Ever since Robert Bosch founded his company in 1886, Bosch has been known for its innovative strength, efficiency, reliability, and quality of work. The Bosch Thermotechnology division is responsible for all activities involving heating technology and hot-water solutions. The division has a number of major international and regional thermotechnology brands and supplies people with state-of-the-art technologies worldwide.

The photo series below provide a portrayal of the development of modern heating technology, water heating and the brands of the Bosch Thermotechnology division.

Buderus fuel cell about to be launched, 2015

After successful field tests in the past years, Buderus is now preparing the market launch of its power-generating heating unit using highly efficient fuel cell technology: The energy centre Logapower FC10 with a space heating efficiency of A++ according to the EU directive on energy efficiency will be available from early 2016 for new and existing one and two-family homes.

System technology of the future, 2015

The compact gas condensing heating centre Buderus Logamax plus GB192iT combines modular expandability and trend-setting design

With integrated DHW storage tank and a footprint of only 0.5 square metres combines modularly expandable system technology and connection compatibility.

Greater efficiency for the service business, 2015

The HomeCom Pro online platform from Junkers allows installers to network with their customers heating systems. HomeCom Pro shows them the status of all networked customer systems and lists the system history including all previous service calls. What makes HomeCom Pro unique is that it not only reports a system error or problem but also indicates the most likely cause as well as measures to solve the problem.

Consistently simple, 2015

Junkers revolutionises its condensing systems: The new boiler generation Cerapur 9000i presented by Junkers at ISH Energy stands out by its simple installation and operation as well as its extraordinary design. The new Internet-ready generation is the first evidence of the new approach of Junkers.

New apps for expert advice, 2013

Buderus launches new apps to support heating professionals during customer visits or on the construction site. The apps allow them to find information and capture relevant data on their smartphone or tablet computer while on the road or advising customers on site.

One of the six new apps is the EasyControl app, which allows heating engineers to remotely control and service a large number of heating systems across multiple buildings.

Bosch Thermotechnology opens new production facility in India, 2012

Bosch Thermotechnology opens a new production plant for solar thermal collectors in the South Indian city of Kumbalgodu, near Bangalore. Since 2011, Bosch Thermotechnology has marketed industrial boilers, gas-fired water heaters and solar thermal systems in India. The new production facility will produce new flat collectors especially for the Indian market; they are used in solar thermal single-circuit hot water systems.

Bosch Thermotechnology takes over Brazilian solar thermal manufacturer Heliotek, 2012

Headquartered in Sao Paulo, Heliotek Maquinase Equipamentos develops, produces and markets solar thermal systems and heat pumps for water heating in residential buildings and for commercial applications, e.g. in hotels, schools and sports facilities. The products are made in Alphaville and distributed to some 200 dealers via a country-wide distribution network.

Energy Plus Home: Bosch technology shows the way, 2011

In December 2011, a single-family house in Wetzlar is handed over to its future residents. In the course of a year, the house will supply more energy than consumed by the household - thanks to a photovoltaic system, efficient heating and insulation as well as energy-efficient household appliances from Bosch.

Takeover of Chinese air-conditioning manufacturer Oak, 2011

Headquartered in Qingdao, Oak develops, produces and sells highly efficient heat pumps and air-handling systems for residential building as well as for commercial and industrial applications. The company’s production facility is located in Zibo.

Takeover of Chinese industrial boiler manufacturer Wuhan Tianyuan Boiler, 2011

The technological leader in industrial boilers in China, Wuhan Tianyuan Boiler Co., Ltd., headquartered in Wuhan, primarily produces fire tube and exhaust heat boilers as well as water tube boilers for the generation of heating energy and process heat. Water tube boilers dominate the Asian market for industrial boilers.

Takeover of Köhler & Ziegler Anlagentechnik GmbH, 2010

The takeover of all shares in Köhler & Ziegler GmbH in Lollar, Hesse/Germany, becomes effective on February 1, 2010. Köhler & Ziegler – renamed Bosch KWK Systeme in 2011 – is one of the pioneers in co-generation units and a technology leader in the promising CHP segment.

Acquisition of industrial boiler manufacturer Loos, 2009

Bosch acquires Loos Deutschland GmbH in Gunzenhausen, Bavaria/Germany, including the foreign subsidiaries and investments with effect from August 3, 2009.

Loos is a leading European supplier of highly-efficient steam and hot water boilers for commercial and industrial applications.

Bosch Thermotechnik GmbH, 2008

Established in 2004, BBT Thermotechnik GmbH is renamed Bosch Thermotechnik GmbH with effect from 1 January 2008. This clearly identifies the company as a member of the Bosch Group. The new name associates the company’s strengths more closely with the Bosch name and the Bosch brand. The company benefits even more than before from Bosch’s good worldwide reputation and visibility. Also, the name Bosch Thermotechnik is self-explanatory.

Solar Inside – Control Unit, 2007

The “Solar Inside – Control Unit” system, which saves up to 15 percent energy for domestic water heating and additionally up to 4 percent heating energy, is presented at the 2007 ISH. The energy savings are made possible by a control unit which uses the solar energy for the heating and hot water even more effectively. The patented Junkers optimisation process calculates the probability of the solar yield being sufficient to heat the water.

Start of solar technology production in Aveiro, 2007

Partial view of the new collector assembly department at the Aveiro plant: Production of copper absorbers starts in February 2007, followed one month later by specimen production of collectors. The first solar technology products made in Aveiro are shipped in April 2007.

Bosch takes over electric heat pump manufacturer FHP, 2007

In January 2007 Bosch acquired all the shares of FHP Manufacturing Company based in Fort Lauderdale. FHP is al leading U.S. producer of water-based electric heat pumps used both to heat buildings and to keep them cool. The picture shows the FHP company building in Florida.

New production site in Shanghai, 2006

2006 saw the foundation of RBS Thermotechnology Co., Ltd., a joint venture between Bosch and the Rinnai Corporation of Japan. The new joint venture, which manufactures gas water heaters for export, is based in Shanghai. The previous production operation in Shunde was relocated here in the summer of 2006 and the new site started manufacturing Bosch gas water heaters primarily for the Australian and South American markets in November 2006.

Solar collector production in Wettringen (Münsterland region), 2005

The look inside the production department in Wettringen shows a pre-assembled ‘harp construction’ being placed in the ultrasound welding installation in preparation for the welding process. The ‘harp’ is designed in such a way that the cold solar fluid is pumped into the larger bottom collection tube, then evenly transported upwards through the thinner tubes in order to emerge hot from the upper collection tube into the flow pipe - on its way to the upper header tube the solar fluid is heated by the sun’s energy.

Acquisition of heat pump manufacturer IVT, 2005

In 2005 Bosch acquired the Swedish company IVT Industrier AB. IVT products can operate using geothermal heat, obtained from rocks, the sea, and the outside air, as well as waste heat. Sweden leads the way, when it comes to using heat pumps and the company enjoys a leading market position both here and in Europe by offering the widest range of electric heat pumps.

Compact condensing boiler from the Greenstar Series, 2004/2005

In the years 2004/05, Worcester launches further condensing boilers of the Greenstar Series, which is listed in the highest energy efficiency class. These include the “Greenstar Highflow”, “Ri” as well as the “i”, “Si” and “CDi” devices. The picture shows a “Greenstar I-System” condensing boiler, which blends in unobtrusively with the interior design.

Robert Bosch GmbH acquires Buderus AG, 2003

The photo shows the meeting of senior management from the Bosch Thermotechnology division and Buderus in 2003. The meeting was under the motto “We are shaping the future”. The decision to merge the heating technology activities of Bosch and Buderus – which was taken at the Buderus AG shareholders meeting on May 13, 2004 – took legal effect, when the relevant entries were made in commercial court records in the first half of August 2004.

Advertising for the Vulcano Click HDG, 2000

Developed in Aveiro, Hydropower is the world’s very first gas-fired instantaneous water heater which uses a hydrodynamic generator (HDG) as the energy source for ignition of the burner. It is presented in Portugal in summer 2000 under the brand names “Junkers HydroPower” and “Vulcano Click HDG”. The subsequent launch is supported by a large-scale advertising campaign. The small water turbine which generates electric power in the HDG devices is used as a recurring element of the campaign.

Bosch Heatronic, 1997

The Bosch Heatronic radically modernized the Bosch Thermotechnology division’s range of appliances. It all started with the new Cerapur gas-fired condensing boiler from Junkers, which was showcased at ISH 1995 with the new Heatronic. Reliable Bosch electronics and tried and tested Junkers condensing technology enabled cost-effective and clean heating with maximum convenience.

Takeover of e.l.m. leblanc by Bosch, 1996

In 1996, Robert Bosch GmbH took over e.l.m. leblanc SA in Drancy, near Paris. Together with e.l.m. leblanc, Bosch also acquired Geminox, a company in the Breton town of Saint-Thegonnec, which e.l.m. leblanc had taken over in 1994.

Start of Bosch Thermotechnology’s activities in China, 1995

Bosch Thermotechnology’s activities in China date back to 20 February 1995, when an agreement to establish a joint venture is signed with the Shenzhou Group. Bosch takes a 60 percent stake in the newly established company, which is headquartered in Shunde and manufactures gas-fired instantaneous water-heaters and tabletop gas stoves. In early 1999, Robert Bosch GmbH buys out the other shareholders and renames the company “Bosch Gas Appliances Company”. The photo shows an exhibition booth with thermotechnology devices made by Bosch in China.

Junkers division renamed the Bosch Thermotechnology division, 1995

1995 Junkers become part of the newly created Bosch Thermotechnology division. Bosch saw this reorganization as a mean of strengthening its position in the thermotechnology marketing in Europe that was now virtually without borders. Similar markets were combined based on the principle “Think global, act local” to create synergy effects and enable experts on the relevant market conditions to carry out marketing activities.

Acquisition of Worcester Group plc by Bosch, 1992

Worcester has enjoyed great success in the British heating market since 1962. The head office is located in Worcester in the Midlands. Oil-fired heating boilers are produced at the company’s subsidiary in Clay Cross, in the north of England. In 1992 Robert Bosch GmbH acquired a majority share-holding in the company, it acquired the remaining shares in 1996.

Start of thermotechnology activities in Turkey, 1990

1990 saw the formation of ELBO, a joint venture between Elginkan Holding and Robert Bosch GmbH. The newly built plant in Manisa near Izmir started production in 1991 with gas controls such as safety valves, thermocouples, and magnetic inserts for gas fired heating systems. In 1998 Bosch took over all the ELBO shares and renamed it Bosch Isitma Ürünleri Sanayi ve Ticaret A.S. (Bosch Heating Systems Production and Trading Company).

Takeover of Vulcano Termo-Domesticos by Bosch, 1988

Vulcano Termo-Domesticos was founded in 1977, and by 1985 was Portugal’s market leader to gas-fired hot-water boilers. From the outset the company had close links with Junkers in Wernau. In 1988, Robert Bosch GmbH acquired a 90 percent share of the company (ten years later, it took over the remaining 10 percent). In 1989, the Bosch Group transferred its gas-fired hot-water boiler production from Germany to Portugal.

Wall-mounted gas condensing boiler from Junkers, 1985

In 1985, the new wall-mounted CL-100 gas condensing boiler is presented at the ISH trade show in Frankfurt. “C“ stands for condensation, “L” for Lambda control and “100” for 100 percent efficiency. Compared to previous gas heatings, the flue gas condensation via a second heat exchanger plus Lambda control allows energy consumption to be reduced by up to 15 percent and minimises the amount of the flue gas.

Market launch of 'Nefit Turbo', 1981

After the energy crises of the 1970s, the Dutch “Gasunie” company shifts the focus of its business policy to energy efficiency. Gasunie presents a draft design for a high-efficiency central heating boiler ('HR: Hoog Rendements CV-Ketel') to the Dutch manufacturers. Nefit subsequently designs its own HR boiler under the name of 'Nefit Turbo'. The latter is presented at the 1981 ISH and launched in autumn of the same year.

“Logana-Ecomatic plus” cast iron boiler, 1981

At the 1981 ISH, Buderus presents the “Logana-Ecomatic-plus” gas heating boiler with condensing technology - the logical next step from Buderus’ proprietary low-temperature technology. The boilers are operated during several heating periods to gain experience, finally leading to mass production of “Ecomatic-plus” gas-fired condensing boilers at the beginning of 1983.

Low-temperature heating boiler from Buderus, 1977

At the 1977 ISH, Buderus presents the first Ecomatic heating boilers. Experts are amazed by the revolutionary device, which uses modern controlling technology to continuously control the boiler depending on the outside temperature. The low-temperature boilers developed by Buderus after the 1973 oil crisis make it possible to achieve energy savings of up to 30 percent. The sectional views show the cast boiler and the Ecomatic steel boiler.

First Junkers heat pump, 1975

At the 1975 ISH show in Frankfurt, Junkers presents the prototype of a water/water heat pump, which was installed in a residential building on the river Neckar at the beginning of the year and uses well water as a heat source. In the summer months, the heat pump is used only for water heating. In the winter, it heats up not only the water used in the kitchen and the bathroom but also the heating water. As the outdoor temperature declines, the time of operation of the heat pump increases automatically until it reaches permanent operation. At temperatures below -5 °C, an additional heating is switched on.

Junkers devices with multi-gas burner, 1965

In the 1960s, a large supply network for natural gas, which is cheaper than city gas, is established in Germany. In response to the development of this network, Junkers starts offering heating boilers equipped with multi-gas burners in 1965. These can easily be adapted to the respective gas type (including liquid gas) simply by replacing two nozzles. The picture shows a Junkers heating boiler (right) and an instantaneous water heater.

“Loganatherm” innovation from Buderus, 1958

In this new design, the Logana 20, 30 and 31 boilers made by Buderus in Lollar are integrated with a water heater to form an organic and functional unit, with the heater sitting on top of the cast iron sectional boiler. The outputs of the boiler and the heater are matched in such a way that sufficient hot water is available at all times.

Research Lab at the Buderus plant in Lollar, 1953

Having been virtually unused during the Second World War, the Research Lab resumes operation in 1949. Between 1954 and 1956, Buderus launches an entirely new generation of boilers. The G 80 W gas boiler with built-in atmospheric gas burner is exemplary of the newly developed boilers for the medium and high output range.

Final assembly of the Junkers Quell, 1953

Following the acquisition of factory premises in Wernau near Stuttgart, in 1952 with the assistance of Robert Bosch GmbH, Junkers production and administrative operations were recolated from Stuttgart to Wernau in 1953. The photo shows production production line assembly of the Junkers Quell.

Junkers production and repair-workshops at the Behr radiator factory

Junkers associates from the recolated facilities in the Asch region of Czechoslowakia who came to work to Stuttgart in October 1945 started out the same year in a repair workshop for gas water heaters at the company’s Stuttgart sales office. At the end of 1946, the opportunity arose to rent premises belonging to Julius Friedrich Behr South German Radiator Factory in Stuttgart and set up production and repair workshops.

Start of production by Dessa Wärmegeräte GmbH in Stuttgart, 1949

Due to problems with the materials used, Dessa-Wärmegeräte GmbH in Stuttgart, which has repaired Junkers devices since December 1945, can start production only in June 1949 (the Dessau factory of Junkers & Co. GmbH had been expropriated). At the time production is started, the company employs 149 people.

Bosch take-over of Junkers & Co. GmbH in Dessau near Berlin, 1932

This aerial shot of the gas-fired appliance plant shows the degree of expansion that was taking place when Bosch took over Junkers on November 4, 1932. At the front of the picture you can see the administrative building, behind it the laboratories and to the right of center the workshops. The halls on the left-hand side house the assembly shops.

Special boilers for oil firing, around, 1930

Having manufactured large oil-fired boilers since 1915, Buderus offers the first German oil-fired special boiler around 1930 after having improved the geometry of the combustion chamber. This boiler is designed to meet the special requirements of oil firing. Oil burners allowing flawless combustion and regulation are available in large quantities by that time.

Shell design, a world’s first (“nutshell type”), 1928

In 1928, Junkers launches the NEA 38, which is considered to be a path-breaking innovation. The construction of the NEA Type is special not only because all internal parts, including the detachable fittings, are accessible but also because the exhaust hood and the complete flue can remain on the wall untouched when the interior of the device is dismantled. This shell-type design eventually emerges as the industry standard for gas-fired devices in Germany and abroad.

Cooperation between Junkers and the Bauhaus in Dessau

The Bauhaus building erected in 1925/26 and the Master Houses built at the same time are equipped with gas-fired water heaters and radiators from Junkers. The kitchen and the bathroom of the lecturer residence “Am Horn” in Weimar were equipped with gas-fired water heaters from Junkers already back in 1923. The Bauhaus school and Junkers are ideal partners. The upper section of the advertisement shows the Gropius House in Dessau.

“Logana” in-room boiler from Buderus, 1924

On 21 June 1924, Buderus registers the “Logana” type (derived from the old name of the river Lahn) as a trademark for in-room boilers. The “Logana” in-room boilers are initially available as “Model A” (round boiler) and “Model B”. The form of the boilers is designed to be similar to that of an in-room stove in order to make them suitable for domestic use.

Patent specification for sectional boilers, 1898

Established in 1895, Eisenwerke Hirzenhain und Lollar, a joint stock company led by Hugo Buderus, has cast sections for cast heating boilers on a subcontractor basis in Lollar since 1895, thus starting industrial mass production of cast sectional boilers in Germany. With the aim of producing its own sectional boilers, the company obtains the first patent with effect from 22 April 1898.

First wall-mounted gas-fired bath boiler from Junkers, 1896

To be able to offer his bath boiler at a favourable price but also with a view to saving space, Junker produces the first wall-mounted bath boiler, which is connected only to the gas pipe, in 1896. This is another pioneering invention. An illustration showing his nephew sitting on top of the wall-mounted bath boiler, which Junkers uses in his advertising, was effective in convincing consumers of the benefits of this design.

Junkers patent “Liquid Heater”, 1894

Based on his previous research, Hugo Junkers develops a “liquid heater”. After having obtained the patent with effect from 20 June 1894 (issued on 16 January 1896), Junkers establishes the firm “Junkers & Co“ together with a partner (who leaves the company already in 1897) on 2 July 1895 to industrially exploit his developments. In the application for the patent, Junkers describes the technical principle of condensing technology.

Lollar and Buderus’ Main-Weser Ironworks, around 1870

The picture shows the Main-Weser Ironworks (former Hedwigshütte) in Lollar (Gießen district). This is where coke furnace smelting in the region today known as Mittelhessen (Central Hesse) started in 1862.

Friedrichshütte Ironworks, the nucleus of the Buderus company, 1731

On 14 March 1731, Johann Wilhelm Buderus takes on the lease of Friedrichshütte Ironworks near Laubach in Oberhessen (Upper Hesse), thereby laying the foundations of Buderus. The Ironworks produces cast ironware and pig iron. The painting shows a view of Friedrichshütte from around 1820.