Bosch · Junkers 🇩🇪

Junkers is the surname that in Spain is associated with the gas heater, and its history begins with an engineer better known for his airplanes. Hugo Junkers patented a calorimeter in 1892 and a liquid heater in 1894, and on July 2, 1895 founded Junkers & Co. in Dessau; in 1896 he presented the first wall‑mounted gas bathroom heater, the origin of all later “Junkers heaters.” The company led the German market for gas appliances for heating and cooking, but the crisis of Junkers’ other ventures led it to insolvency and on November 4, 1932 Hugo sold the division to Robert Bosch for 2.6 million marks.

Under Bosch, Junkers became the group's brand for heaters, water heaters, and boilers, with innovations such as piezoelectric ignition, and in Spain it became a generic term: for decades “putting a Junkers” was synonymous with installing a heater. In 2008 all activities were grouped under Bosch Thermotechnik and in 2019 the Junkers brand was withdrawn in favor of Bosch, so the current Bosch Climate splits and aerothermal heat pumps are the direct heirs of that Dessau house. On April 1, 2023 the division was renamed Bosch Home Comfort Group, based in Wetzlar, and in 2025 completed the largest purchase in Bosch’s history: the Johnson Controls‑Hitachi climate business for about €7.4 billion, placing it among the world’s largest air‑conditioning manufacturers. In the 2025 fiscal year it generated roughly €4.4 billion in revenue.

Pending verification

The history of Junkers/Bosch Termotecnia in Spain (arrival date, Aranjuez factory) could not be documented with sources, nor the entry date of Bosch into domestic air conditioning.

History machine-translated from Spanish. Can you improve it? Write to us.