OSO Acc200 SuperStream 200L Cold Water Accumulator Tank
OSO Acc200 SuperStream 200 L Accumulator — Patented power-free cold Water Accumulator Tank booster with CAD2 diaphragm technology | Delivers up to ~80 l/min extra flow | Silent, zero-energy, zero-maintenance solution for medium-demand homes | Lightweight composite tank | Horizontal or vertical install (horizontal requires cradle – sold separately) | WRAS-approved butyl membrane | 5-year warranty | Requires Upstream Kit 22/28 mm (sold separately)
The OSO SuperStream Acc200 is the mid-range model in the acclaimed SuperStream series — designed specifically for properties where the Acc130’s 130 L capacity might be stretched during peak times (e.g. morning rush with 2 showers + kitchen running). It delivers the same revolutionary performance as the smaller unit but with double the total volume and approximately double the usable stored water (~100 L effective at 1.5 bar differential), giving noticeably longer high-flow periods before relying solely on incoming mains.
Like all SuperStream accumulators, it uses the patented CAD2 (Controlled Action Diaphragm 2) technology: a food-grade butyl diaphragm separates stored potable water from a nitrogen-precharged air chamber. When demand exceeds supply, the diaphragm gently pushes stored water into the system — boosting flow and stabilising pressure without any pumps, electricity, noise or maintenance. The result is powerful, consistent performance across multiple outlets, even on weak or restricted mains supplies common in many UK homes.
The corrosion-proof composite fiberglass/epoxy shell is exceptionally strong yet weighs only 22 kg empty — making it far easier to manoeuvre into lofts, cupboards or plant rooms than traditional steel vessels. A key advantage over the Acc130 is the option for horizontal mounting (using the dedicated Horizontal Cradle 11007329), which is invaluable in space-restricted installations.
What Makes the SuperStream Acc200 Special?
- Zero Running Costs Forever — No electricity, no pump servicing, no filters — truly sustainable and budget-friendly long-term.
- Completely Silent — 0 dB operation — perfect for bedrooms, quiet homes or night-time use (unlike booster pumps).
- Patented CAD2 Diaphragm — Prevents waterlogging, delivers even pressure, maximises usable volume (~100 L effective).
- Horizontal or Vertical Flexibility — Unique in the range — horizontal option saves valuable headroom in lofts/cupboards (cradle required).
- Lightweight & Corrosion-Proof — Composite construction outperforms steel tanks in longevity and ease of handling.
- Expandable to Any Size — Link multiple units in parallel for commercial-level flow without replacing the system.
- WRAS & Regulation Compliant — Butyl membrane (WRAS 1501305) safe for drinking water systems; fully meets UK water bylaws.
Key Features
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 11007351 |
| Total Vessel Volume | 200 litres |
| Usable Water Volume | ~100 litres (at 1.5 bar differential pressure) |
| Dimensions (Ø × Height – vertical) | 542 × 1098 mm |
| Empty Weight | 22 kg |
| Full Weight (approx.) | 122 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
✅ Essential companions: Upstream Kit 22/28 mm (11007380) for the first unit + Add-on Kit (11007327) for each extra accumulator. For horizontal install use Horizontal Cradle (11007329). For very low incoming pressure add Charger Pump (11007348).
Frequently Asked Questions
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OSO Acc200 SuperStream 200L Cold Water Accumulator Tank
OSO Acc200 SuperStream 200 L Accumulator — Patented power-free cold Water Accumulator Tank booster with CAD2 diaphragm technology | Delivers up to ~80 l/min extra flow | Silent, zero-energy, zero-maintenance solution for medium-demand homes | Lightweight composite tank | Horizontal or vertical install (horizontal requires cradle – sold separately) | WRAS-approved butyl membrane | 5-year warranty | Requires Upstream Kit 22/28 mm (sold separately)
The OSO SuperStream Acc200 is the mid-range model in the acclaimed SuperStream series — designed specifically for properties where the Acc130’s 130 L capacity might be stretched during peak times (e.g. morning rush with 2 showers + kitchen running). It delivers the same revolutionary performance as the smaller unit but with double the total volume and approximately double the usable stored water (~100 L effective at 1.5 bar differential), giving noticeably longer high-flow periods before relying solely on incoming mains.
Like all SuperStream accumulators, it uses the patented CAD2 (Controlled Action Diaphragm 2) technology: a food-grade butyl diaphragm separates stored potable water from a nitrogen-precharged air chamber. When demand exceeds supply, the diaphragm gently pushes stored water into the system — boosting flow and stabilising pressure without any pumps, electricity, noise or maintenance. The result is powerful, consistent performance across multiple outlets, even on weak or restricted mains supplies common in many UK homes.
The corrosion-proof composite fiberglass/epoxy shell is exceptionally strong yet weighs only 22 kg empty — making it far easier to manoeuvre into lofts, cupboards or plant rooms than traditional steel vessels. A key advantage over the Acc130 is the option for horizontal mounting (using the dedicated Horizontal Cradle 11007329), which is invaluable in space-restricted installations.
What Makes the SuperStream Acc200 Special?
- Zero Running Costs Forever — No electricity, no pump servicing, no filters — truly sustainable and budget-friendly long-term.
- Completely Silent — 0 dB operation — perfect for bedrooms, quiet homes or night-time use (unlike booster pumps).
- Patented CAD2 Diaphragm — Prevents waterlogging, delivers even pressure, maximises usable volume (~100 L effective).
- Horizontal or Vertical Flexibility — Unique in the range — horizontal option saves valuable headroom in lofts/cupboards (cradle required).
- Lightweight & Corrosion-Proof — Composite construction outperforms steel tanks in longevity and ease of handling.
- Expandable to Any Size — Link multiple units in parallel for commercial-level flow without replacing the system.
- WRAS & Regulation Compliant — Butyl membrane (WRAS 1501305) safe for drinking water systems; fully meets UK water bylaws.
Key Features
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 11007351 |
| Total Vessel Volume | 200 litres |
| Usable Water Volume | ~100 litres (at 1.5 bar differential pressure) |
| Dimensions (Ø × Height – vertical) | 542 × 1098 mm |
| Empty Weight | 22 kg |
| Full Weight (approx.) | 122 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
✅ Essential companions: Upstream Kit 22/28 mm (11007380) for the first unit + Add-on Kit (11007327) for each extra accumulator. For horizontal install use Horizontal Cradle (11007329). For very low incoming pressure add Charger Pump (11007348).
Frequently Asked Questions
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
OSO Acc200 SuperStream 200 L Accumulator — Patented power-free cold Water Accumulator Tank booster with CAD2 diaphragm technology | Delivers up to ~80 l/min extra flow | Silent, zero-energy, zero-maintenance solution for medium-demand homes | Lightweight composite tank | Horizontal or vertical install (horizontal requires cradle – sold separately) | WRAS-approved butyl membrane | 5-year warranty | Requires Upstream Kit 22/28 mm (sold separately)
The OSO SuperStream Acc200 is the mid-range model in the acclaimed SuperStream series — designed specifically for properties where the Acc130’s 130 L capacity might be stretched during peak times (e.g. morning rush with 2 showers + kitchen running). It delivers the same revolutionary performance as the smaller unit but with double the total volume and approximately double the usable stored water (~100 L effective at 1.5 bar differential), giving noticeably longer high-flow periods before relying solely on incoming mains.
Like all SuperStream accumulators, it uses the patented CAD2 (Controlled Action Diaphragm 2) technology: a food-grade butyl diaphragm separates stored potable water from a nitrogen-precharged air chamber. When demand exceeds supply, the diaphragm gently pushes stored water into the system — boosting flow and stabilising pressure without any pumps, electricity, noise or maintenance. The result is powerful, consistent performance across multiple outlets, even on weak or restricted mains supplies common in many UK homes.
The corrosion-proof composite fiberglass/epoxy shell is exceptionally strong yet weighs only 22 kg empty — making it far easier to manoeuvre into lofts, cupboards or plant rooms than traditional steel vessels. A key advantage over the Acc130 is the option for horizontal mounting (using the dedicated Horizontal Cradle 11007329), which is invaluable in space-restricted installations.
What Makes the SuperStream Acc200 Special?
- Zero Running Costs Forever — No electricity, no pump servicing, no filters — truly sustainable and budget-friendly long-term.
- Completely Silent — 0 dB operation — perfect for bedrooms, quiet homes or night-time use (unlike booster pumps).
- Patented CAD2 Diaphragm — Prevents waterlogging, delivers even pressure, maximises usable volume (~100 L effective).
- Horizontal or Vertical Flexibility — Unique in the range — horizontal option saves valuable headroom in lofts/cupboards (cradle required).
- Lightweight & Corrosion-Proof — Composite construction outperforms steel tanks in longevity and ease of handling.
- Expandable to Any Size — Link multiple units in parallel for commercial-level flow without replacing the system.
- WRAS & Regulation Compliant — Butyl membrane (WRAS 1501305) safe for drinking water systems; fully meets UK water bylaws.
Key Features
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 11007351 |
| Total Vessel Volume | 200 litres |
| Usable Water Volume | ~100 litres (at 1.5 bar differential pressure) |
| Dimensions (Ø × Height – vertical) | 542 × 1098 mm |
| Empty Weight | 22 kg |
| Full Weight (approx.) | 122 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
✅ Essential companions: Upstream Kit 22/28 mm (11007380) for the first unit + Add-on Kit (11007327) for each extra accumulator. For horizontal install use Horizontal Cradle (11007329). For very low incoming pressure add Charger Pump (11007348).
