OSO Maxi GeoCoil MGC1000 1000L Commercial Heat Pump Cylinder | 15kW 3-Phase High-Capacity Unvented Storage

The OSO Maxi GeoCoil MGC1000 is a 1000 litre commercial unvented heat pump cylinder from OSO's class-leading MAXI commercial range, designed for maximum hot water production from heat pumps up to 40 kW. Featuring a massive 7.0 m² smooth scale-resistant titanium alloy coil and advanced VIP + NANOPUR insulation, it delivers rapid recovery and exceptional energy efficiency for demanding commercial applications.

Key Features

• 1000 litre capacity serves large commercial properties, hotels, schools and multiple dwellings.
• 7.0 m² oversized primary coil optimised for heat pumps up to 40 kW and solar collectors up to 40 m².
• Class-leading C-rated efficiency with 141W standing heat loss through advanced VIP and foam insulation.
• 15 kW 3-phase immersion heaters (2 x 7.5 kW) positioned above coil as booster and backup for legionella protection.
• 10 bar design pressure with EVERLAST™ high-alloy stainless steel and ULTRAWELD™ technology for extreme corrosion resistance.
• Thermostat adjustable 60-90°C with anti-legionella cycle and holiday mode for hygiene compliance.
• Compact 1000 mm diameter x 2100 mm height maximises capacity in commercial plant rooms.
• Complete factory-fitted controls including expansion vessel, safety valves and motorised zoning.

Why Buy the OSO Maxi GeoCoil MGC1000?

As part of OSO's proven 50-year commercial MAXI series, the MGC1000 offers unmatched durability, efficiency and customisability for high-demand hot water systems while meeting stringent commercial hygiene and energy regulations.

The combination of oversized heat exchanger, high-power electric backup and superior insulation ensures reliable performance with significant lifetime energy savings in the most demanding applications.

Suitable For

• Commercial properties – hotels, restaurants, schools, hospitals, leisure centres with high hot water demand.
• Multiple occupancy buildings – student accommodation, care homes, HMO's serving 50+ people.
• Large heat pump systems up to 40 kW requiring high-capacity indirect storage with solar integration.
• Facilities requiring legionella compliance through high-temperature boost capability.

Technical Specifications

• Brand: OSO Hotwater
• Model: Maxi GeoCoil MGC1000 (15 kW 3x230V + HX 7.0 m²)
• Type: Commercial indirect unvented heat pump cylinder
• Capacity: 1000 litres (865L actual volume)
• Energy Rating: C (ErP)
• Standing Heat Loss: 141W / ~3.4 kWh/24hrs (EN12897)
• Dimensions: Ø1000 mm x 2100 mm height
• Weight: 225 kg empty / ~1225 kg full
• Primary Coil: 7.0 m² smooth scale-resistant titanium alloy
• Heat Pump Capacity: Up to 40 kW + solar up to 40 m²
• Immersion Heaters: 2 x 7.5 kW (15 kW total 3-phase 230/400V)
• Design Pressure: 10 bar
• Thermostat: 70°C setpoint (adjustable 60-90°C) with safety cut-out
• Tank Material: EVERLAST™ high-alloy stainless steel with ULTRAWELD™
• Warranty: 5-10 years commercial tank warranty

Installation & Compliance

Factory-assembled with complete commercial G3 controls package including oversized expansion vessel, multiple safety valves and zoning controls for professional installation in compliance with UK Building Regulations and commercial hygiene standards.