Custom designed hot water cylinder for heat pumps up to 25 kW

The hot water cylinders from the MAXI series has shown class-leading operational durability for commercial hot water systems through the last 50 years. MAXI has been constructed with EVERLAST™ high-alloy stainless steel in combination with ULTRAWELD™ technology for optimal corrosion resistance. MAXI series can be modified according to customer requirements.

The hot water cylinder MAXI GEOCOIL — MGC has been custom-made for maximum hot water production from heat pumps up to 40 kW (400 L = 25 kW / 600 / 1 000 L = 40 kW), with the large surface area, smooth piped, scale-resistant heating coil. The units are also suitable for solar collectors up to 40 m². MAXI GEOCOIL has ultra-grade INCOTEC immersion heaters as booster above the heating coil, raising the temperature to increase capacity and prevent bacterial growth. The booster heaters also provides maximum safety if there are any operational problems with the energy source. The electric immersion heaters has optional effect 5–15 kW, 230–400 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.Installation kits for cold water inlet with shut-off valve, hot water outlet with mixing valve, plate heat exchanger with pumps (TURBOSYSTEM) and piping for connecting multiple units has been custom-made to fit directly on the MAXI series, with double sealing for an added layer of safety.

• Highly efficient DHW production from heat pump up to 40 kW
• Extreme operational safety with electric heater as booster / back-up
• 10 bar design pressure and class-leading corrosion resistance



MAXI MGC400 SECTION VIEW SIDE e1612172724116MAXI MGC600 SECTION VIEW SIDE e1612172683963MAXI MGC1000 SECTION VIEW SIDE e1612172633268
SpecificationsUNITMGC 400 - 15 kW / 3 × 230 V + HX 2,8 m²MGC 600 - 15 kW / 3 × 230 V + HX 4,6 m²MGC 1000 - 15 kW / 3 × 230 V + HX 4,6 m²
Product no.OSO8001852 8001873 8001854
Product nameMGC 400 - 15 kW / 3 × 230 V + HX 2,8 m² MGC 600 - 15 kW / 3 × 230 V + HX 4,6 m² MGC 1000 - 15 kW / 3 × 230 V + HX 4,6 m²MGC 1000 - 15 kW / 3 × 230 V + HX 4,6 m²
UsageNot applicableNot applicableNot applicable
Diameter — ⌀mm595780 1000
Height - Hmm217520302100
Packagingmm595 × 595 × 2240 800 × 800 × 2000 1020 × 1020 × 2200
Freight volumedm37871280 2289
Technical/ErP information
CapacitypersonsNot ApplicableNot ApplicableNot Applicable
Capacity 40°CLNot applicable Not applicableNot applicable
Heat-up time ΔT 65°ChoursN/A N/AN/A
Thermostat set point°C757575
Heat loss-EN 12897watt96118141
AEC (energy consumption)kW/yearNot applicableNot applicableNot applicable
Energy efficiency%Not applicableNot applicableNot applicable
Tapping profile3XS–XXLNot applicableNot applicableNot applicable
Energy ratingA+–FCCC


Substantially higher temperature (70°C+), highly efficient mixing valve (no scolding), minimal heat loss and optimal design features gives up to 20 % more hot water and class leading capacity.

The use of NANOPUR™ with insulation values far surpassing Pentane, often in combination with VACUUM panels, ensures minimum heat loss and class leading energy efficiency.

EVERLAST™ titanium alloyed stainless steel in combination with OSO’s unique ULTRAWELD™ system and state-of-the-art passivation process equals class leading corrosion resistance.

EVERLAST™ titanium alloyed, high tensile strength, stainless steel equals lower weight and efficient use of resources. OSO products are more than 40 % lighter than enameled products.

INCOTEC™ el. immersion heaters with ultra high-grade Incoloy 825 stainless, DZR brass, zinc-free soldering and carefully calculated surface loads results in maximum durability in hard water.