OSO Acc450 SuperStream 450L Cold Water Accumulator Tank
OSO Acc450 SuperStream 450 L Accumulator — Largest power-free cold water booster in the SuperStream range with patented CAD2 diaphragm | Up to ~80 l/min extra flow | Silent, zero-energy, zero-maintenance | ~225 L usable volume | Vertical install only | WRAS-approved butyl membrane | 5-year warranty | Designed for very large homes, guest houses, small hotels or commercial applications
Provides the longest possible sustained high-flow period before relying on incoming mains. Ideal when 5+ outlets or heavy simultaneous use is common. No electricity, no noise, no servicing. Scalable with multiple units for even larger systems.
The OSO SuperStream Acc450 is the flagship model in the SuperStream accumulator family — engineered specifically for properties or light commercial sites with extreme simultaneous demand (large family homes, multiple occupancy buildings, small hotels, care facilities, or offices with many bathrooms and appliances). With an impressive 450 litres total volume and approximately 225 litres of usable stored water (at 1.5 bar differential), it delivers the longest buffer of boosted performance, ensuring powerful, consistent pressure across the entire system even during peak usage.
Like the entire SuperStream range, it operates entirely on incoming mains pressure via the patented CAD2 (Controlled Action Diaphragm 2) system — silently supplementing flow by up to ~80 litres per minute with absolutely no electricity, no moving parts, no noise and no maintenance requirements throughout its 5-year warranty period and beyond. The heavy-duty composite fiberglass/epoxy shell is exceptionally corrosion-resistant, weighs only 46 kg empty (still far lighter than equivalent steel vessels), and is built for long-term reliability in high-demand environments.
This model is vertical-mount only (no horizontal cradle available), making it suited to taller dedicated spaces such as plant rooms, garages, basements or utility cupboards. It requires no annual servicing and continues to boost performance flawlessly during power cuts — a true “install once and forget” solution for maximum reliability.
What Makes the SuperStream Acc450 Special?
- Maximum Reserve Capacity — ~225 L usable volume — the longest high-flow sustainment of any SuperStream model.
- Completely Passive & Cost-Free — Zero electricity, zero running costs, zero CO₂ — the greenest way to achieve powerful flow.
- Patented CAD2 Diaphragm — Prevents waterlogging, delivers stable pressure, maximises effective storage.
- Ultra-Resilient Composite — Fibreglass/epoxy shell resists corrosion indefinitely — lighter and more durable than steel.
- Commercial-Grade Scalability — Easily parallel multiple units for hotels, care homes, multi-let properties or larger sites.
- WRAS Hygienic Approval — Butyl membrane (WRAS 1501305) fully safe for potable/drinking water systems.
- Absolute Silence — 0 dB operation — perfect for residential or noise-sensitive commercial environments.
Key Features
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 11007355 |
| Total Vessel Volume | 450 litres |
| Usable Water Volume | ~225 litres (at 1.5 bar differential) |
| Dimensions (Ø × Height – vertical only) | 614 × 1831 mm |
| Empty Weight | 46 kg |
| Full Weight (approx.) | 271 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. For very low incoming pressure add Charger Pump (11007348). Vertical mount only — no horizontal cradle available for this model.
Frequently Asked Questions
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OSO Acc450 SuperStream 450L Cold Water Accumulator Tank
OSO Acc450 SuperStream 450 L Accumulator — Largest power-free cold water booster in the SuperStream range with patented CAD2 diaphragm | Up to ~80 l/min extra flow | Silent, zero-energy, zero-maintenance | ~225 L usable volume | Vertical install only | WRAS-approved butyl membrane | 5-year warranty | Designed for very large homes, guest houses, small hotels or commercial applications
Provides the longest possible sustained high-flow period before relying on incoming mains. Ideal when 5+ outlets or heavy simultaneous use is common. No electricity, no noise, no servicing. Scalable with multiple units for even larger systems.
The OSO SuperStream Acc450 is the flagship model in the SuperStream accumulator family — engineered specifically for properties or light commercial sites with extreme simultaneous demand (large family homes, multiple occupancy buildings, small hotels, care facilities, or offices with many bathrooms and appliances). With an impressive 450 litres total volume and approximately 225 litres of usable stored water (at 1.5 bar differential), it delivers the longest buffer of boosted performance, ensuring powerful, consistent pressure across the entire system even during peak usage.
Like the entire SuperStream range, it operates entirely on incoming mains pressure via the patented CAD2 (Controlled Action Diaphragm 2) system — silently supplementing flow by up to ~80 litres per minute with absolutely no electricity, no moving parts, no noise and no maintenance requirements throughout its 5-year warranty period and beyond. The heavy-duty composite fiberglass/epoxy shell is exceptionally corrosion-resistant, weighs only 46 kg empty (still far lighter than equivalent steel vessels), and is built for long-term reliability in high-demand environments.
This model is vertical-mount only (no horizontal cradle available), making it suited to taller dedicated spaces such as plant rooms, garages, basements or utility cupboards. It requires no annual servicing and continues to boost performance flawlessly during power cuts — a true “install once and forget” solution for maximum reliability.
What Makes the SuperStream Acc450 Special?
- Maximum Reserve Capacity — ~225 L usable volume — the longest high-flow sustainment of any SuperStream model.
- Completely Passive & Cost-Free — Zero electricity, zero running costs, zero CO₂ — the greenest way to achieve powerful flow.
- Patented CAD2 Diaphragm — Prevents waterlogging, delivers stable pressure, maximises effective storage.
- Ultra-Resilient Composite — Fibreglass/epoxy shell resists corrosion indefinitely — lighter and more durable than steel.
- Commercial-Grade Scalability — Easily parallel multiple units for hotels, care homes, multi-let properties or larger sites.
- WRAS Hygienic Approval — Butyl membrane (WRAS 1501305) fully safe for potable/drinking water systems.
- Absolute Silence — 0 dB operation — perfect for residential or noise-sensitive commercial environments.
Key Features
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 11007355 |
| Total Vessel Volume | 450 litres |
| Usable Water Volume | ~225 litres (at 1.5 bar differential) |
| Dimensions (Ø × Height – vertical only) | 614 × 1831 mm |
| Empty Weight | 46 kg |
| Full Weight (approx.) | 271 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. For very low incoming pressure add Charger Pump (11007348). Vertical mount only — no horizontal cradle available for this model.
Frequently Asked Questions
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
OSO Acc450 SuperStream 450 L Accumulator — Largest power-free cold water booster in the SuperStream range with patented CAD2 diaphragm | Up to ~80 l/min extra flow | Silent, zero-energy, zero-maintenance | ~225 L usable volume | Vertical install only | WRAS-approved butyl membrane | 5-year warranty | Designed for very large homes, guest houses, small hotels or commercial applications
Provides the longest possible sustained high-flow period before relying on incoming mains. Ideal when 5+ outlets or heavy simultaneous use is common. No electricity, no noise, no servicing. Scalable with multiple units for even larger systems.
The OSO SuperStream Acc450 is the flagship model in the SuperStream accumulator family — engineered specifically for properties or light commercial sites with extreme simultaneous demand (large family homes, multiple occupancy buildings, small hotels, care facilities, or offices with many bathrooms and appliances). With an impressive 450 litres total volume and approximately 225 litres of usable stored water (at 1.5 bar differential), it delivers the longest buffer of boosted performance, ensuring powerful, consistent pressure across the entire system even during peak usage.
Like the entire SuperStream range, it operates entirely on incoming mains pressure via the patented CAD2 (Controlled Action Diaphragm 2) system — silently supplementing flow by up to ~80 litres per minute with absolutely no electricity, no moving parts, no noise and no maintenance requirements throughout its 5-year warranty period and beyond. The heavy-duty composite fiberglass/epoxy shell is exceptionally corrosion-resistant, weighs only 46 kg empty (still far lighter than equivalent steel vessels), and is built for long-term reliability in high-demand environments.
This model is vertical-mount only (no horizontal cradle available), making it suited to taller dedicated spaces such as plant rooms, garages, basements or utility cupboards. It requires no annual servicing and continues to boost performance flawlessly during power cuts — a true “install once and forget” solution for maximum reliability.
What Makes the SuperStream Acc450 Special?
- Maximum Reserve Capacity — ~225 L usable volume — the longest high-flow sustainment of any SuperStream model.
- Completely Passive & Cost-Free — Zero electricity, zero running costs, zero CO₂ — the greenest way to achieve powerful flow.
- Patented CAD2 Diaphragm — Prevents waterlogging, delivers stable pressure, maximises effective storage.
- Ultra-Resilient Composite — Fibreglass/epoxy shell resists corrosion indefinitely — lighter and more durable than steel.
- Commercial-Grade Scalability — Easily parallel multiple units for hotels, care homes, multi-let properties or larger sites.
- WRAS Hygienic Approval — Butyl membrane (WRAS 1501305) fully safe for potable/drinking water systems.
- Absolute Silence — 0 dB operation — perfect for residential or noise-sensitive commercial environments.
Key Features
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 11007355 |
| Total Vessel Volume | 450 litres |
| Usable Water Volume | ~225 litres (at 1.5 bar differential) |
| Dimensions (Ø × Height – vertical only) | 614 × 1831 mm |
| Empty Weight | 46 kg |
| Full Weight (approx.) | 271 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. For very low incoming pressure add Charger Pump (11007348). Vertical mount only — no horizontal cradle available for this model.
