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 COIL — MC is ideal for direct electric operation during summer and can be switched to boiler operation during winter. MAXI COIL comes standard with a smooth-piped, scaleesistant heating coil with a capacity of up to 30 kW from the boiler. The electric immersion heaters have optional effect 2.5–15 kW, 230–400 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 kit and Vessel can be supplied.

Other sizes and specifications are available to order.

• Energy flexibility for summer / winter operation, or as back-up
• Extreme operational durability with el. heaters w/o contactors
• 10 bar design pressure and class-leading corrosion resistance



SpecificationsUNITMC 1000 – 15 kW / 3 × 230 V + HX 1,0 m²MC 600 – 15 kW / 3 × 230 V + HX 1,0 m²
Product no.OSO
Product nameMC 1000 - 2 x 7.5 kW 400v  + HX 1,0 m²MC 600 - 2.5kW-400 V + HX 1,0 m²
Diameter — ⌀mm1000800
Height - Hmm21002030
Weight emptykg189114
Technical/ErP information
Capacity 40CLN / AN / A
Thermostat set pointC7070
Heat loss-EN 12897watt142N / A
Heat loss / 24 hrs - EN 12897kWh/dayN / A
AEC (energy consumption)kW/yearN/AN/A
Energy efficiency%N/AN/A
Tapping profile3XS–XXLN/AN/A
Energy ratingA+–FCC
Primary Heating PowerkW3030
Primary coil sizeMins1m2
Immersion Heating Power2 x7.52 x 7.5
Heat-up time ΔT 55°C CoilMins
Heat-up time ΔT 55°C upper elementMinsN/AN/A
Heat-up time ΔT 55°C lower elementMinN/AN/A
Recovery time ΔT 55°C coil 70%Mins7246
Recovery time ΔT 55°C upper element 70MinsN/AN/A
Recovery time ΔT 55°C lower element 70%MinsN/AN/A