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Extremely Low Weight

OSO was an early adaptor of stainless Duplex steel for the production of water heaters. Duplex provides OSO’s Super series with lower weight, higher strength and better corrosion resistance than previous models.

Duplex is a steel quality with a higher strength than traditional material qualities being used for water heaters.


This makes it possible to reduce the material thickness. This results in an increase in strength, a lower weight and also a reduced material consumption which corresponds perfectly with OSO’s environmental approach. For the installer it means easier handling during transportation and installation of the product.


While one needed several persons to install a water heater in for example a basement, only one person is required with today’s modern water products. This is resource-saving for both the installer and the end user and most importantly – environmentally friendly.

Extremely Low Heat Loss