OSO Hotwater is the world’s largest manufacturer of stainless steel unvented hot water cylinders.
Manufactured in Norway since 1932, OSO cylinders have won countless awards for quality and sustainable production.
Unvented hot water cylinders connect directly to the water main and provide high pressure hot water to showers and taps throughout the building
Register your cylinder for warranty and book for service and or repair with OSO’s Approved Service and Warranty team.
Joining OSO Approved Certified Installer gives you access to approved spares, training, and work revenue opportunities.
OSO Partner offers better rewards, more support, promotions, training and exclusive events.
At OSO Spares you can buy all current and historic official OSO cylinders and spare parts.
Quality
Throughout 60 years we have perfected the stainless steel heater. The combination of material choice, robotized production and intelligent solutions gives the OSO products unbeatable lifetime.
Energy efficiency
OSO heaters have the lowest heat loss on the market, and are designed to give maximum performance. This gives our products the lowest power consumption and a unique lifespan economy for our customers.
Environment
50 years of efforts and investments to unite people, environment and industry, and for this given several awards. In three generations our objective has been the same:
Protect Our Beautiful Planet!
News
THE FUTURE ROLE OF HOT WATER CYLINDERS IN BALANCING GRID DEMAND
4 WAYS OF SAVING ENERGY ON WATER HEATING
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 litres 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
“NORTHEM” integrated heating unit and storage tanks is launched
1968
The “SAFE” system – triple-valve and surface mounted thermostat is introduced
1968
Heaters heated directly by electricity simplifies installation and operation
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 “PROGRESS” water heater line is introduced for heat pumps
1985
The “TURBO” system with plate exchanger revolutionises 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
The new “ECO FOAM” insulation saves more than 500 million kWh in 10 years
2012
OPTIMA TRIPLE COIL er bransjens mest avanserte varmesentral med unike fordeler
2015
DELTA serien oppnår ErP rating A - verdens best isolerte beredere
2017
NANOPUR isolering og bruk av VACUUM paneler sparer 200 mill. kWh over 10 år
2014
Insourcing the production of special components, and establishing OSO manufacturing AB in Sweden
2015
As a consequence of the implementation of the ErP directive in Norway,
integration of vacuum panels improves insulation
2016
The “DELTA” series receives rating “A” from ErP – best in class
2018
OSO Manufacturing AB starts production of large size heaters in stainless steel, with volumes up to 15,000 liters!
2020
OSO releases "VERSA", "WALLY", and the "OPTIMA" series
The Future
Development never stops, and OSO has a lot we are looking forward to share with our customers in the future!
