The OSO 18R hot water calorifier is available in two storage capacities. The secondary water can either be heated by electric immersion heaters or indirect flow and return heating from a boiler. If required the calorifier can be supplied for connection to both heat sources.

Secondary pressure vessel factory pressure tested to 15 bar.
Secondary maximum working pressure 10 bar.
Primary pressure vessel factory pressure tested to 4 bar
Primary maximum working pressure 3 bar ( higher pressures upon request).
Double convex constructions eliminates dead zones in calorifier.
Outer primary water jacket design ensures even heat transfer.
All units manufactured to the international standard ISO/DIS 2694 (BS 5500)
All units supplied with 1" BSP secondary return as standard, larger sizes available upon request.