OSO Acc250 SuperStream 250L Cold Water Accumulator Tank
OSO Acc250 SuperStream 250 L Accumulator — High-capacity power-free cold water booster with patented CAD2 diaphragm | Up to ~80 l/min extra flow | Silent, zero-energy, zero-maintenance | ~125 L usable volume | Horizontal or vertical install (cradle required for horizontal) | WRAS-approved butyl membrane | 5-year warranty | Ideal for 3+ bathroom homes or light commercial
Delivers extended high-flow periods for multiple showers, baths, kitchen & utility use simultaneously. No electricity, no noise, no servicing. Expandable with add-on kits for even greater capacity.
The OSO SuperStream Acc250 is the largest vertical/horizontal accumulator designed for residential and light commercial applications where very high simultaneous demand is expected — think large family homes, guest houses, or small offices with multiple bathrooms and appliances. With 250 litres total volume and approximately 125 litres of usable stored water (at 1.5 bar differential), it provides significantly longer periods of boosted flow before falling back to incoming mains performance.
Powered entirely by incoming mains pressure and the patented CAD2 diaphragm system, it silently supplements flow by up to ~80 litres per minute with zero electricity, zero noise and zero maintenance requirements. The composite fiberglass/epoxy construction is lightweight (27 kg empty), corrosion-proof and far more durable than traditional steel vessels. A standout feature is the ability to mount horizontally using the dedicated Horizontal Cradle (11007329), making it ideal for space-constrained lofts, plant rooms or under-stair cupboards.
What Makes the SuperStream Acc250 Special?
- Highest Home Capacity — ~125 L usable reserve — longest high-flow duration in the domestic SuperStream range.
- Completely Passive & Green — No power, no CO₂, no bills — sustainable boosting that works during power cuts.
- Patented CAD2 Technology — Prevents waterlogging, ensures consistent pressure delivery, maximises effective volume.
- Horizontal or Vertical Flexibility — Horizontal option (with cradle) saves valuable vertical space in tight installations.
- Ultra-Durable Composite — Fibreglass/epoxy shell resists corrosion indefinitely — lighter and stronger than steel.
- Scalable to Commercial Levels — Parallel multiple units easily for hotels, care homes or multi-let properties.
- WRAS Hygienic Approval — Butyl membrane (WRAS 1501305) safe for drinking water systems.
Key Features
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 11007352 |
| Total Vessel Volume | 250 litres |
| Usable Water Volume | ~125 litres (at 1.5 bar differential) |
| Dimensions (Ø × Height – vertical) | 542 × 1303 mm |
| Empty Weight | 27 kg |
| Full Weight (approx.) | 152 kg |
| Connections | 1¼" BSP male × 28 mm compression |
| Max Working Pressure | 8.6 bar (860 kPa) |
| Pre-charge Pressure | 1.4 bar (factory — adjustable) |
| Max Boost Head (closed valve) | 4.3 bar |
| Water Temperature Range | 4 °C to 35 °C |
| Ambient Temperature Max | 40 °C |
| Membrane Material | Butyl rubber (WRAS 1501305) |
| Tank Construction | Continuous strand fibreglass + epoxy resin |
| Warranty | 5 years (vessel & diaphragm) |
What's in the Box
✅ Required accessories: Upstream Kit 22/28 mm (11007380) for first unit + Add-on Kit (11007327) per extra accumulator. Horizontal install needs Horizontal Cradle (11007329). Low pressure? Add Charger Pump (11007348).
Frequently Asked Questions
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OSO Acc250 SuperStream 250L Cold Water Accumulator Tank
OSO Acc250 SuperStream 250 L Accumulator — High-capacity power-free cold water booster with patented CAD2 diaphragm | Up to ~80 l/min extra flow | Silent, zero-energy, zero-maintenance | ~125 L usable volume | Horizontal or vertical install (cradle required for horizontal) | WRAS-approved butyl membrane | 5-year warranty | Ideal for 3+ bathroom homes or light commercial
Delivers extended high-flow periods for multiple showers, baths, kitchen & utility use simultaneously. No electricity, no noise, no servicing. Expandable with add-on kits for even greater capacity.
The OSO SuperStream Acc250 is the largest vertical/horizontal accumulator designed for residential and light commercial applications where very high simultaneous demand is expected — think large family homes, guest houses, or small offices with multiple bathrooms and appliances. With 250 litres total volume and approximately 125 litres of usable stored water (at 1.5 bar differential), it provides significantly longer periods of boosted flow before falling back to incoming mains performance.
Powered entirely by incoming mains pressure and the patented CAD2 diaphragm system, it silently supplements flow by up to ~80 litres per minute with zero electricity, zero noise and zero maintenance requirements. The composite fiberglass/epoxy construction is lightweight (27 kg empty), corrosion-proof and far more durable than traditional steel vessels. A standout feature is the ability to mount horizontally using the dedicated Horizontal Cradle (11007329), making it ideal for space-constrained lofts, plant rooms or under-stair cupboards.
What Makes the SuperStream Acc250 Special?
- Highest Home Capacity — ~125 L usable reserve — longest high-flow duration in the domestic SuperStream range.
- Completely Passive & Green — No power, no CO₂, no bills — sustainable boosting that works during power cuts.
- Patented CAD2 Technology — Prevents waterlogging, ensures consistent pressure delivery, maximises effective volume.
- Horizontal or Vertical Flexibility — Horizontal option (with cradle) saves valuable vertical space in tight installations.
- Ultra-Durable Composite — Fibreglass/epoxy shell resists corrosion indefinitely — lighter and stronger than steel.
- Scalable to Commercial Levels — Parallel multiple units easily for hotels, care homes or multi-let properties.
- WRAS Hygienic Approval — Butyl membrane (WRAS 1501305) safe for drinking water systems.
Key Features
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 11007352 |
| Total Vessel Volume | 250 litres |
| Usable Water Volume | ~125 litres (at 1.5 bar differential) |
| Dimensions (Ø × Height – vertical) | 542 × 1303 mm |
| Empty Weight | 27 kg |
| Full Weight (approx.) | 152 kg |
| Connections | 1¼" BSP male × 28 mm compression |
| Max Working Pressure | 8.6 bar (860 kPa) |
| Pre-charge Pressure | 1.4 bar (factory — adjustable) |
| Max Boost Head (closed valve) | 4.3 bar |
| Water Temperature Range | 4 °C to 35 °C |
| Ambient Temperature Max | 40 °C |
| Membrane Material | Butyl rubber (WRAS 1501305) |
| Tank Construction | Continuous strand fibreglass + epoxy resin |
| Warranty | 5 years (vessel & diaphragm) |
What's in the Box
✅ Required accessories: Upstream Kit 22/28 mm (11007380) for first unit + Add-on Kit (11007327) per extra accumulator. Horizontal install needs Horizontal Cradle (11007329). Low pressure? Add Charger Pump (11007348).
Frequently Asked Questions
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
OSO Acc250 SuperStream 250 L Accumulator — High-capacity power-free cold water booster with patented CAD2 diaphragm | Up to ~80 l/min extra flow | Silent, zero-energy, zero-maintenance | ~125 L usable volume | Horizontal or vertical install (cradle required for horizontal) | WRAS-approved butyl membrane | 5-year warranty | Ideal for 3+ bathroom homes or light commercial
Delivers extended high-flow periods for multiple showers, baths, kitchen & utility use simultaneously. No electricity, no noise, no servicing. Expandable with add-on kits for even greater capacity.
The OSO SuperStream Acc250 is the largest vertical/horizontal accumulator designed for residential and light commercial applications where very high simultaneous demand is expected — think large family homes, guest houses, or small offices with multiple bathrooms and appliances. With 250 litres total volume and approximately 125 litres of usable stored water (at 1.5 bar differential), it provides significantly longer periods of boosted flow before falling back to incoming mains performance.
Powered entirely by incoming mains pressure and the patented CAD2 diaphragm system, it silently supplements flow by up to ~80 litres per minute with zero electricity, zero noise and zero maintenance requirements. The composite fiberglass/epoxy construction is lightweight (27 kg empty), corrosion-proof and far more durable than traditional steel vessels. A standout feature is the ability to mount horizontally using the dedicated Horizontal Cradle (11007329), making it ideal for space-constrained lofts, plant rooms or under-stair cupboards.
What Makes the SuperStream Acc250 Special?
- Highest Home Capacity — ~125 L usable reserve — longest high-flow duration in the domestic SuperStream range.
- Completely Passive & Green — No power, no CO₂, no bills — sustainable boosting that works during power cuts.
- Patented CAD2 Technology — Prevents waterlogging, ensures consistent pressure delivery, maximises effective volume.
- Horizontal or Vertical Flexibility — Horizontal option (with cradle) saves valuable vertical space in tight installations.
- Ultra-Durable Composite — Fibreglass/epoxy shell resists corrosion indefinitely — lighter and stronger than steel.
- Scalable to Commercial Levels — Parallel multiple units easily for hotels, care homes or multi-let properties.
- WRAS Hygienic Approval — Butyl membrane (WRAS 1501305) safe for drinking water systems.
Key Features
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 11007352 |
| Total Vessel Volume | 250 litres |
| Usable Water Volume | ~125 litres (at 1.5 bar differential) |
| Dimensions (Ø × Height – vertical) | 542 × 1303 mm |
| Empty Weight | 27 kg |
| Full Weight (approx.) | 152 kg |
| Connections | 1¼" BSP male × 28 mm compression |
| Max Working Pressure | 8.6 bar (860 kPa) |
| Pre-charge Pressure | 1.4 bar (factory — adjustable) |
| Max Boost Head (closed valve) | 4.3 bar |
| Water Temperature Range | 4 °C to 35 °C |
| Ambient Temperature Max | 40 °C |
| Membrane Material | Butyl rubber (WRAS 1501305) |
| Tank Construction | Continuous strand fibreglass + epoxy resin |
| Warranty | 5 years (vessel & diaphragm) |
What's in the Box
✅ Required accessories: Upstream Kit 22/28 mm (11007380) for first unit + Add-on Kit (11007327) per extra accumulator. Horizontal install needs Horizontal Cradle (11007329). Low pressure? Add Charger Pump (11007348).
