The MAXI series is the class-leading commercial range of hot water calorifiers, built to the high standards of design and efficiency that is synonymous with OSO Hotwater products. The MAXI range has been manufactured with EVERLAST™ high-alloy stainless steel in combination with ULTRAWELD™ technology for optimal corrosion resistance. Not only is the MAXI range extremely efficient, with industry-leading performance, it can also be modified according to customer requirements.

MAXI XPRESS — MX boasts twice the available immersion heater capacity as the standard, is heated either with the integrated electric INCOTEC immersion heaters, or via an external energy source and the TURBOSYSTEM with plate heat exchanger (optional capacity) and double sets of pumps for extra operational safety. The electric immersion heaters has optional effect 3–27 kW, 400 V + N 3-phase, and is thermostat controlled 60–90 °C in three steps with separate safety thermostats. Contactors are not required and the support cable is connected directly to the central.

G3 Kits and expansion vessel as standard

Other sizes and specifications are available to order.

• Extreme operational durability with el. heaters w/o contactors
• 10 bar design pressure and class-leading corrosion resistance



SpecificationsUNITMX 1000 – 3 x 9kWMX 600 – 3 x 9 kW
Product no.OSO80016548001652
Product nameMX 1000 - 3 x 9kWMX 600 - 3 x9kW
Diameter — ⌀mm1000800
Height - Hmm21002030
Weight emptykg184106
Technical/ErP information
Capacity 40CLN / AN / A
Thermostat set pointC7070
Heat loss-EN 12897watt142120
Heat loss / 24 hrs - EN 12897kWh/day2,88
AEC (energy consumption)kW/yearN/AN/A
Energy efficiency%N/AN/A
Tapping profile3XS–XXLN/AN/A
Energy ratingA+–FCC
Primary Heating PowerkWN / AN / A
Primary coil sizeMinsN / AN / A
Immersion Heating Power3 x 93 x 9
Heat-up time ΔT 55°C CoilMinsN/AN/A
Heat-up time ΔT 55°C upper elementMinsN/AN/A
Heat-up time ΔT 55°C lower elementMin
Recovery time ΔT 55°C coil 70%MinsN/AN/A
Recovery time ΔT 55°C upper element 70MinsN/AN/A
Recovery time ΔT 55°C lower element 70%Mins7247


OSO Hotwater product brochure UK

Manual Maxi Xpress – MX 600-1000 litres