Specific or complex project ahead? Get in touch for a free, fast quote.
Stuart Turner Mainsboost 250S Accumulator Vessel (Add-on Unit) – 250 Litre Cold Water Storage
Regular price
£695.00
Inc. VAT
£579.17
Exc. VAT
FREE Express Delivery (1-3 days) in UK Mainland on most orders*
Excluding: Solar Panels (£170 delivery / free above £2,500), Batteries (£39 delivery), Small Items (£4.95/5.95 delivery / free above £500)
Contact Us to check for Next Working Day Delivery or Same-day Delivery options
Contact Us for Click & Collect options
Custom quote available on request
*See checkout or shipping policy for full details
Payment options
Tools & Kits
Build your kit
Need a full system?
Design your complete solution in minutes with our kit builders.
Do you have a question
about this product?
One of our expert advisors will be happy to help you!
Contact Us
Stuart Turner Mainsboost 250S Accumulator Vessel (Add-on Unit) – 250 Litre Cold Water Storage
The Stuart Turner Mainsboost 250S Accumulator Vessel (Add-on Unit) is a high-capacity pressurised cold water storage vessel designed to expand existing Mainsboost systems. With a nominal size of 250 litres and a usable cold water storage capacity of approximately 110 litres, this add-on unit ensures enhanced flow and pressure stability for medium to large domestic or commercial water systems.
Why Buy the Mainsboost 250S Accumulator Vessel?
- Expandability: Effectively increases storage capacity in multi-vessel Mainsboost booster systems, providing enhanced pressure buffering and water flow during peak demand.
- Robust Construction: Made with an epoxy-coated steel body and a durable virgin butyl diaphragm for long-lasting, maintenance-free operation.
- WRAS Approved: Certified for safe potable water use and compliance with UK water regulations.
- Minimal Maintenance: Silent operation with no electrical consumption or moving parts, reducing upkeep requirements.
- Simplifies System Upgrade: Adds capacity without complicated plumbing changes or system modifications.
- Comprehensive Kit: Supplied complete with Upstream Line-In Kit (ULK) with 22mm fittings for easy installation.
- Long Warranty: Backed by a 5-year manufacturer warranty for reliable performance peace of mind.
Suitable For
- Mainsboost systems requiring additional water storage capacity to meet high flow or pressure demand.
- Medium to large domestic or commercial properties with multiple bathrooms and water outlets.
- Situations where pressure vessel capacity needs to be expanded for sustained water delivery.
- Installations compliant with WRAS and UK water safety regulations.
Technical Specifications
| Feature | Specification |
|---|---|
| Nominal Vessel Size | 250 litres |
| Usable Storage Capacity | Approx. 110 litres |
| Material | Epoxy coated steel body with virgin butyl diaphragm |
| Connection Size | 22 mm (Upstream Line-In Kit included) |
| Mounting | Floor mounted |
| Operating Temperature Range | Min 4°C / Max 35°C |
| Weight | Approx. 41 kg (including fittings) |
| Dimensions (H x W x D) | 558 x 540 x 1206mm |
| WRAS Approved | Yes |
| Warranty | 5 Years |
MPN: 44626
BTU & WATT Calculator
Room Dimensions
Room Type
Living Room
Bedroom
Kitchen
Bathroom
Conservatory
Hallway
Glazing Type
Single Glazed
Double Glazed
Triple Glazed
External Walls
0 Wall
1 Wall
2 Walls
3 Walls
4 Walls
Insulation Level
Poor
Average
Good (New Build)
Required Heating
0
Watts
0
BTUs
Tools & Kits
Build your kit
Need a full system?
Design your complete solution in minutes with our kit builders.
Do you have a question
about this product?
One of our expert advisors will be happy to help you!
Contact Us