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Since the founding of OSO in 1932 as one of the first welding companies in Norway, OSO has been owned by the Braathen family. The founder, Reidar Frölich Braathen, was both a smith and a pilot lieutenant. Through methodical and hard work and a continuous improvement of the products, he had 100 employees before turning 40 years old.


The second generation, Chris Reidar Frölich Braathen, was an environmentalist at heart, and drove the company towards environmentally sustainable methods. Through his 50 years as CEO OSO has been recognized as one of the leading environmental companies in the Nordic region.

Third generation of the Braathen family is running the business today. Christoffer and Sigurd Braathen has a clear objective: OSO shall continue to be a Norwegian industrial company and maintain its focus on quality and environment.


For 80 years, OSO has led the water heater development in Scandinavia. In 1970, OSO was the first in the world to mass-produce stainless steel water heaters. We are proud that OSO has never had a negative result. Today, OSO has a turnover of approx. 50 million EURO. The activities are divided into three main sectors: Norway, Export and OEM. The export goes primarily towards the UK, Nordic and Russian markets.