OSO Delta DC210 210L Indirect Unvented Hot Water Cylinder

The OSO Delta Coil DC210 is a 210 litre indirect unvented hot water cylinder featuring award-winning vacuum insulation panels (VIP) and NANOPUR foam insulation for ultra-low heat loss and the highest energy efficiency on the market. This ErP A-rated cylinder delivers powerful mains pressure hot water while minimising running costs and supporting SAP compliance.

Key Features

• 210 litre capacity ideal for medium-sized households with multiple bathrooms.
• ErP A-rated efficiency – the most efficient unvented cylinder available, reducing heat loss by up to 400 kWh/year.
• Vacuum insulation panels + NANOPUR technology for class-leading standing heat loss of just 43 watts.
• High-grade titanium-alloyed stainless steel tank with 25-year warranty and superior corrosion resistance.
• Smooth scale-resistant primary coil (1.1 m²) ensures efficient heat transfer from boilers or heat pumps.
• Digital thermostat with holiday mode and anti-legionella function for optimised hygiene and energy savings.
• Factory-fitted unvented kit including expansion vessel, T&P relief valve, combination valve, tundish and Honeywell motorised valve.
• Compact dimensions: 595 mm diameter x 1270 mm height fits standard UK airing cupboards.
• 3 kW INCOTEC backup immersion heater positioned above coil for maximum safety and reliability.

Why Buy the OSO Delta Coil DC210?

Recognised as the most energy-efficient unvented cylinder series, the OSO Delta DC210 helps housebuilders and homeowners achieve stringent SAP ratings while delivering substantial lifetime energy savings that can pay back the cylinder cost.

With its innovative insulation, durable construction and comprehensive factory controls, this cylinder offers reliable performance, minimal maintenance and long-term value backed by OSO's renowned quality engineering.

Suitable For

• Medium family homes (3-4 bedrooms) with 1-2 bathrooms and moderate to high hot water demand.
• System boilers, regular boilers and heat pump installations requiring indirect unvented storage.
• New build developments and refurbishments targeting maximum SAP scores and ErP compliance.
• Space-conscious installations where compact footprint and superior efficiency are essential.

Technical Specifications

• Brand: OSO Hotwater
• Model: Delta Coil DC210 (Product code: 11009118)
• Type: Indirect unvented mains pressure hot water cylinder
• Capacity: 210 litres (193L actual volume)
• Energy Rating: A (ErP)
• Standing Heat Loss: 43W / 1.03 kWh/24hrs (EN12897)
• Dimensions: Diameter 595mm x Height 1270mm
• Weight: 239.7 kg full / 40.7 kg empty
• Primary Coil: 1.1 m² smooth scale-resistant
• Heat-up Time (ΔT 55°C coil): 28.4 minutes
• Recovery Time (70% ΔT 55°C): 19.9 minutes
• Immersion Heater: 3 kW (1 x 230V) INCOTEC backup
• Tank Material: EVERLAST™ titanium-alloyed stainless steel
• Warranty: 25 years on tank, 2 years on components
• Thermostat: Digital 20-70°C (preset 60°C) with anti-legionella

Installation & Compliance

Complete with G3-compliant unvented controls including 10 bar T&P valve, separate expansion vessel and all necessary safety components for professional installation by qualified engineers.