WHAT WE OFFER

For more than 50 years we’ve perfected the stainless steel water heater. The ideal combination of premium materials, automated manufacturing and intelligent solutions makes our products last longer.

SUPER™

Integrated design, higher temperature, more hot water in a same-size unit and class-leading insulation equals unbeatable performance.

ErP DIRECTIVE

The ERP directive raise the bar for water heating. OSO products exceeds expectations, without compromising capacity.

DELTA™

Eye-catching design, A-rating with vacuum insulation panels and efficient heating coils for green energy makes DELTA our best unit ever.

This is OSO

Vision

Stainless steel water heaters with class leading quality and efficiency.

Environment

50 years of continuous efforts environmental awareness with industrial efficiency. We are proud of our contribution to protect our beautiful planet

Quality

For six decades we’ve perfected the stainless steel water heater. The ideal combination of premium materials and automated manufacturing makes our products last longer.

Innovation

We design for minimum heat loss and maximum energy efficiency, without compromise, making our customers’ heating system cost-efficient.

Innovation timeline

1932

Norway’s first autogenous welded storage tank is produced at Oslo Svesiebedrift.

1935

Welded cooking pots and wood boilers complements the range of products.

1938

Development of wood-burning boilers which provides both heat and hot-water.

1941

Production of potato collector cogs and planting equipment during the war.

1945

Production of copper-lined storage tanks 200 – 50,000 liters resumes.

1955

Provision storage tanks tripled the capacity while only taken half the space.

1957

“TRIPLEX” and “COMPACT” heating units for oil and wood/electrical units.

1959

“NORTHERM” integrated heating unit and storage tanks is launched.

1968

The “SAFE” system with its triple-valve and surface mounted thermostat is introduced.

1968

First in the world to produce stainless steel storage tanks which increases lifespan.

1968

First in the world to produce stainless steel storage tanks which increases lifespan.

1979

The “SUNSAVER” solar-heated storage tanks are launched.

1980

Top-mounted mixing valves becomes standard, resulting in huge resource savings.

1984

The tank-in-tank unit “PROGESSS” water heater line is introduced for heat pumps.

1985

The “TURBO” system with plate exchanger revolutionizes heat-up times.

1988

The “EXPRESS” storage tanks with flip/flop thermostat heats water 3 times faster.

1993

The “UNIVERSAL” electric boilers 15-45 kW without contactors makes installation easier.

1994

“THERMO TOP” reduces heat loss from standard storage tanks by 20%.

1999

The “MAXI” large storage tanks 500-1000 liters becomes industry standard.

2001

The warranty is doubled on the stainless steel pressure tank.

2004

ECO FOAM saves more than 500 million kWh in heat loss over 10 years.

2007

“ENERGY SAVER” for grey water reuse results in huge Energy Efficiency savings.

2008

The “OPTIMA” line triples the capacity and increases the efficiency for heat pumps.

2010

“EXPANSION” is introduced with a fully integrated expansion solution.

2012

“OPTIMA TRIPLE COIL” is the industry’s most advanced heating central.

2015

The “DELTA” series receives rating “A” from ErP – best in class.

2017

NANOPUR and VACUUM panels saves 200 million kWh over 10 years.

The future

The development never stops, and OSO has a lot of exciting things, we look forward sharing with our customers in the future

Did you know...

PRO INSULATION

The use of NANOPUR™ with insulation values far surpassing Pentane, often in combination with VACUUM panels, ensures minimum heat loss and class leading energy efficiency.

The Family business

As one of the few remaining family businesses in Norway, we're proud to add value to both products and community since 1932.

STRONGER

EVERLAST™ titanium alloyed stainless steel in combination with OSO’s unique ULTRAWELD™ system and state-of-the-art passivation process equals class leading corrosion resistance

MARKET LEADER

Is the leading manufacturer of stainless steel water heaters in Europe. We are proud to represent Norway’s most robotized manufacturing plant. 

ENVIRONMENT AT HEART

OSO was one of Scandinavia's very first green companies and has been awarded as the most eco-friendly business in the HVAC industry.

BUILT TO LAST

INCOTEC™ el. immersion heaters with ultra high-grade Incoloy 825 stainless, DZR brass and carefully calculated surface loads results in maximum durability in hard water.

85 YEARS OF EXPERIENCE

Europe's very first manufacturer of stainless steel water heaters with more than 85 years of experience. It's all we do.

THE GREEN SHIFT

OSO supplies heaters to many of the leading heat producers in Europe in the field of alternative energy.