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 STANDARD — MS is suitable for most commercial hot water demands, and is heated either with the integrated electric INCOTEC immersion heaters. The electric immersion heaters has optional effect 2.5–15 kW, 400 V  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 included

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



SpecificationsUNITMS 300 – 15 kW / 3 x 230 VMS 400 – 2 x 7.5 kWMS 600 – 2 x 7.5 kWMS 1000 – 2 x7.5kW
Product no.OSO
Product nameMS 300 – 2 x7.5 kW MS 400 – 2 x 7.5kW MS 600 – 2 x 7.5 kW MS 1000 – 2 x 7.5kW
Diameter — ⌀mm5955958001000
Height - Hmm1765222520302100
Weight emptykg5777135236
Technical/ErP information
Capacity 40CLN / AN / AN / AN / A
Thermostat set pointC70707070
Heat loss-EN 12897wattN / AN / A119140
Heat loss / 24 hrs - EN 12897kWh/dayN / AN / A
AEC (energy consumption)kW/yearN/AN/AN/AN/A
Energy efficiency%N/AN/AN/AN/A
Tapping profile3XS–XXLN/AN/AN/AN/A
Energy ratingA+–FCCCC
Primary Heating PowerkWN / AN / AN / AN / A
Primary coil sizeMinsN / AN / AN / AN / A
Immersion Heating Power2 x 7.52x 7.52x7.52 x 7.5kW
Heat-up time ΔT 55°C CoilMinsN/AN/AN/AN/A
Heat-up time ΔT 55°C upper elementMinsN/AN/AN/AN/A
Heat-up time ΔT 55°C lower elementMin
Recovery time ΔT 55°C coil 70%MinsN/AN/AN/AN/A
Recovery time ΔT 55°C upper element 70MinsN/AN/AN/A
Recovery time ΔT 55°C lower element 70%Mins466195144