GRP Cold Water Storage Tanks Built for the UK
Tricel Water manufactures Regulation 4(1)a approved GRP cold water storage tanks – sectional and one-piece – from 45 litres to over 4,000,000 litres. Specified by consulting engineers, MEP contractors, and facilities managers. Compliant with BS EN 13280:2001, WRAS, and the Building Safety Act 2022. Two UK manufacturing sites.
UK GRP Cold Water Tank Market – Key Data
GRP cold water storage tanks installed in UK annually
40–60% replacement-driven; 40–60% new build
Typical GRP design life (BS EN 13280)
Annual inspection required under HSE ACOP L8
Non-domestic premises in England & Wales
15–18% estimated to have cold water storage
Years of UK GRP manufacturing heritage
Weston-super-Mare · Lanark
Certified & Approved
Reg. 4(1)a - Water Fittings Regs 1999
GRP cisterns specification standard
Fire sprinkler tanks - BS EN 12845
Association of Tank & Cistern Manufacturers
Third-party quality assurance
Golden Thread documentation
M&E Consultant/Specifier
Specify a Tank
NBS clauses, BIM/Revit objects, CIBSE-accredited CPD, BS EN 13280 data sheets, CIBSE Guide G sizing methodology, and Building Safety Act 2022 Golden Thread documentation.
Facilities Manager/Building Owner
Replace an Existing Tank
Is your tank over 20 years old? Non-compliant with WRAS or ACOP L8? We survey, remove, and replace with a compliant GRP alternative. ACOP L8 and BSA 2022 compliance documentation on handover.
M&E Contractor/Main Contractor
New Build Project
Trade pricing, same-day quotation on standard sizes, nationwide installation crews, and full project management for healthcare, education, commercial, and industrial new build.
What is a GRP cold water storage tank?
A GRP cold water storage tank is a water storage vessel manufactured from glass fibre-reinforced plastic. GRP is the dominant material for cold water storage in UK commercial buildings because it is corrosion-resistant, food-grade, UV-stable, and lightweight relative to steel or concrete. All GRP cold water storage tanks must comply with the Water Supply (Water Fittings) Regulations 1999, Schedule 2, Paragraph 4(1)a and be manufactured to BS EN 13280:2001. Where installed in commercial or residential premises, annual inspection under HSE ACOP L8 is required. In higher-risk buildings, tanks must be documented in the Golden Thread of building information under the Building Safety Act 2022.
Years UK manufacturing
UK manufacturing sites
GRP tank capacity range
UK manufactured panels
PRODUCT RANGE
GRP cold water storage - every capacity, from one source
Both product families are manufactured at our two UK sites, carry WRAS Regulation 4(1)a approval, and comply with BS EN 13280:2001 and the Water Supply (Water Fittings) Regulations 1999.
ONE PIECE
GRP One Piece Tanks
45 litres — 16,000 litres · Single-mould construction
Manufactured from a single mould with no seams or joints. Encapsulated PU foam insulation complies with Water Fittings Regulations 1999, Schedule 2. Available in AB air gap and Cat 5 configurations. Selected sizes available for same-day despatch.
45L - 16,000L
Capacity Range
25-30 YEAR
Design Life
25/30mm
Insulation Options
NEXT DAY
Selected Sizes
Sectional
GRP Sectional Tanks
1,000 litres — 4,000,000 litres · Hot-press panel build
Modular hot-press moulded 1m GRP panels, assembled on site by our directly-employed, CSCS-certified engineers. The correct solution where access restricts delivery of a one-piece tank, or where capacity requirements exceed 16,000 litres. IFB, EFB, TIF, and L-shaped configurations available.
1,000L - 14M+L
Capacity Range
IFB \ EFB \ TIF
Base Configurations
1m x 1m
Standard Panel
NATIONAL
Installation Coverage
Fire Sprinkler Tanks
LPCB approved · BS EN 12845
Combined Tank & Pump Station
Integrated booster set solutions
CPD for Specifiers
CPD certified · 2 courses
Building Safety Act 2022
Cold water storage and your legal obligations under the Building Safety Act 2022
For higher-risk buildings, GRP tanks are safety-critical infrastructure. The Act introduces new documentation requirements that affect building owners, facilities managers, and specifiers on new-build projects.
Applies to all higher-risk buildings (HRBs) - from 1 October 2023
The Building Safety Act 2022 imposes legal duties on Principal Accountable Persons (PAPs) for HRBs — defined as residential buildings of at least 18 metres or 7 storeys with two or more dwellings. Cold water storage systems form part of the Golden Thread of building information and must be documented accordingly. Failure to maintain accurate, current records is a criminal offence under the Act.
BSA 2022, s.72 — Principal Accountable Person
PAP Obligations — Cold Water Storage
The PAP holds legal responsibility for the Safety Case and Golden Thread. For cold water storage this includes ensuring tanks are:
- Compliant with WRAS and BS EN 13280:2001
- Included in the building asset register
- Subject to annual ACOP L8 inspection
- Documented with installation date and commissioning record
Concurrent Duty — HSE ACOP L8
Dutyholder — Legionella Compliance
Under HSE ACOP L8, the dutyholder must maintain cold water storage tanks below 20°C, ensure annual inspection, and appoint a competent person. This duty runs concurrently with BSA 2022 obligations — both require documented, current evidence that can be produced on request by the Building Safety Regulator.
Concurrent Duty — CDM 2015
Principal Designer & Contractor
Under CDM 2015, the Principal Designer must ensure GRP tank specifications are in the Health and Safety File. The Principal Contractor must ensure as-built records are passed to the client. These records feed directly into BSA 2022 Golden Thread submissions for new HRB projects.
How Tricel Supports Compliance
Documentation on Handover
Tricel provides a complete compliance documentation pack on tank handover: WRAS approval certificate, BS EN 13280 declaration of conformity, as-built drawings, installation record, commissioning sign-off, and maintenance schedule — ready for immediate submission to your Golden Thread system.
Golden Thread Asset Register — minimum data for GRP cold water storage tanks (BSA 2022)
Tank type (sectional / one-piece / TIF)
Manufacturer and product reference
Capacity in litres and m³
Installation date and commissioning record
Material compliance — BS EN 13280:2001
Regulatory approval — WRAS Reg 4(1)a
LPCB reference (fire tanks)
As-built drawings and panel configuration
Last annual inspection date and outcome
Last cleaning date and contractor
Written scheme of examination (ACOP L8)
Remediation and repair history
Current condition rating
Next scheduled inspection date
Legionella & Replacement
When should you replace your existing tank?
Under HSE ACOP L8 and HTM 04-01, building owners and facilities managers have a legal duty of care to maintain cold water storage in a wholesome condition. A degraded or non-compliant tank creates Legionella risk, enforcement exposure, and insurance liability. If any of the following apply, contact us for a free site survey.
Tank is more than 20 years old — approaching end of GRP design life
Insulation absent, degraded, or not encapsulated to current Water Regs standard
Tank lacks WRAS approval or was installed before BS EN 13280:2001
Galvanised steel tank showing corrosion, joint failure, or sediment
Water sampling reveals non-wholesome quality
Tank not documented in BSA 2022 Golden Thread asset register
HOW OLD IS YOUR TANK?
Under 15 years
Annual inspection due
15 – 20 years
Plan for replacement
Over 20 years
Survey recommended now
Steel or concrete tank
Replace with GRP
By Sector
Trusted across every sector of the built environment
Our GRP cold water storage tanks are specified and installed in healthcare, education, commercial buildings, data centres, high-rise residential, and industrial facilities throughout the UK and internationally.
Healthcare & NHS
Compliant with HTM 04-01 and ACOP L8. WRAS-approved potable storage for hospitals, care homes, and health centres. BSA 2022 Golden Thread documentation on handover.
High-Rise & Multi-Storey
TIF sectional tanks for restricted plant rooms. L-shaped configurations for non-standard floor plates. Divided tank options for uninterrupted supply. BSA 2022 compliance standard.
Infrastructure & Utilities
Regulation 4-compliant storage for water networks and utility assets. Large-capacity sectional tanks for resilience and peak demand. Designed for critical infrastructure uptime.
Fire Protection
LPCB-approved sprinkler tanks to LPS 1276. Full compliance with BS EN 12845 and NFPA standards. Dedicated fire water storage for life safety systems.
Data Centres
High-capacity storage for cooling and facility resilience. Divided tanks for business continuity. Engineered solutions to meet uptime and redundancy requirements.
Industrial & Manufacturing
Process and potable water storage for industrial applications. Custom configurations for site constraints. Designed for performance, durability, and operational continuity.
Education
Regulation 4-compliant potable storage for schools, colleges, and universities. Hygienic design aligned with ACOP L8. Reliable supply for high daily occupancy.
Agriculture
Durable water storage for irrigation, livestock, and farm operations. Corrosion-resistant panels for harsh environments. Flexible capacities to support seasonal demand.
Food & Beverage
Hygienic water storage for production and processing environments. Regulation 4-compliant materials supporting food safety standards. Designed to maintain water quality and integrity.
Hospitality & Leisure
Potable water storage for hotels, gyms, and leisure facilities. Hygienic, compliant systems to support guest services. Quiet, efficient operation in occupied environments.
Local Authority & Public
Regulation 4-compliant storage for public buildings and amenities. Robust solutions for schools, leisure centres, and civic infrastructure. Specified for long-term reliability.
Why GRP
The case for GRP over steel and concrete
Material comparison — commercial cold water storage
|
Feature
|
GRP
|
Steel
|
Concrete
|
|---|---|---|---|
|
Durability
|
High
|
High
|
Very High
|
|
Corrosion risk
|
Low
|
High due to rust risk
|
Moderate due to porosity
|
|
Typical lifespan
|
20 - 30+ years
|
20 - 30 years
|
40+ years
|
|
Weight
|
Lightweight
|
Medium
|
High
|
|
Retrofit suitability
|
Very good if sectional
|
Good if sectional
|
Limited
|
|
Installation complexity
|
Low to medium
|
Medium
|
High
|
|
Lining requirement
|
Sometimes, for older tanks
|
Yes
|
Yes
|
|
Common issue
|
Joint leaks or ageing panels
|
Rust and joint failure
|
Cracking and porosity
|
|
Maintenance level
|
Low to medium
|
High
|
Medium
|
|
Best-fit use case
|
Building services cold water storage
|
Industrial or fire protection
|
Large or buried storage
|
Two UK manufacturing facilities
Weston-super-Mare (est. 1956, formerly Dewey Waters) and Lanark (formerly Nicholson Plastics). Combined capacity provides national coverage and manufacturing resilience.
Directly employed installation engineers
CSCS-certified, confined-space trained engineers — factory-trained on Tricel products, not third-party subcontracted labour.
Full compliance documentation on handover
WRAS certificate, BS EN 13280 declaration, as-built drawings, commissioning record, BSA 2022 Golden Thread pack — ready for building asset register.
Consulting Engineers & MEP Designers
Specifying GRP Cold Water Storage Tanks — resources for consulting engineers
Consulting engineers and MEP designers need correct standard references, sizing methodology, and documentation to produce a compliant, buildable specification. Tricel Water provides a complete specification support package at no charge to registered specifiers.
Tank sizing follows CIBSE Guide G (Public Health Engineering) and BS EN 806-3. Demand is calculated from occupancy-based Loading Units, peak flow rates, and a storage period of 24–48 hours depending on supply zone reliability. For multi-storey residential buildings, refer to Tricel’s detailed multi-storey sizing guide.
All Tricel GRP tanks carry WRAS Regulation 4(1)a approval and are manufactured to BS EN 13280:2001. NBS clause support, BIM/Revit families, and product data sheets are available on request. Our CIBSE-accredited CPD courses are accepted for structured CPD logs under CIBSE, BSRIA, and CIOB frameworks.
CIBSE Guide G sizing methodology
BS EN 806-3 · Loading Units · storage period calculation
BS EN 13280:2001 compliance
Material specification · structural testing · hygiene approval
Regulation 4(1)a documentation
Approval certificates supplied for specification use
NBS specification clause support
Available on request from the Tricel technical team
BIM / Revit objects
Sectional and one-piece tank families — available on request
BSA 2022 Golden Thread documentation
Full pack provided on handover for every installation
Common Questions
Frequently Asked Questions
What is a GRP cold water storage tank, and which regulations apply?
A GRP (Glass Reinforced Polymer) cold water storage tank is a water storage vessel manufactured from glass fibre-reinforced plastic. GRP is the dominant material for commercial cold water storage in the UK. All GRP tanks must comply with the Water Supply (Water Fittings) Regulations 1999, Schedule 2, Paragraph 4(1)a and be manufactured to BS EN 13280:2001. CIBSE Guide G and BS EN 806-3 govern sizing. Annual inspection under HSE ACOP L8 is required in commercial premises.
What does the Building Safety Act 2022 mean for cold water storage tanks?
For higher-risk buildings (HRBs) — residential buildings of 18 metres or 7+ storeys with 2+ dwellings — cold water storage tanks are safety-critical infrastructure that must be documented in the Golden Thread of building information. The Principal Accountable Person (PAP) must maintain records covering tank type, WRAS approval status, BS EN 13280 compliance, installation date, annual inspection history, and maintenance contractor. Failure to maintain accurate records is a criminal offence. Tricel provides a complete Golden Thread documentation pack on every installation handover.
What is the difference between a sectional GRP tank and a one-piece GRP tank?
A sectional GRP tank is assembled on site from individual GRP panels bolted together, allowing capacities from 1,000 litres to over 4,000,000 litres and installation through restricted access. A one-piece GRP tank is moulded as a single unit (45 to 16,000 litres) and delivered ready to install. Sectional tanks are specified for commercial, NHS, educational, and multi-storey applications; one-piece tanks for residential and light-commercial. Tricel also offers two-part and TIF configurations for intermediate access restrictions.
When should I replace my existing cold water storage tank?
You should consider replacement when: the tank is over 20 years old (approaching end of GRP design life per BS EN 13280); the tank lacks current WRAS approval or was installed before BS EN 13280:2001; insulation is absent or degraded; the tank is galvanised steel showing corrosion or joint failure; water sampling reveals non-wholesome quality; or the tank is not documented in a BSA 2022 Golden Thread asset register. Contact us for a free site survey — we can survey within 48 hours for urgent situations.
How do I calculate the correct cold water storage tank size?
Cold water tank sizing in the UK is based on peak daily demand plus a resilience allowance, calculated to CIBSE Guide G and BS EN 806-3. For commercial buildings, the calculation uses occupancy, Loading Units, and peak flow rates. For multi-storey residential, refer to our detailed multi-storey sizing guide. Tricel’s free online tank size calculator applies CIBSE Guide G methodology and is suitable for preliminary sizing of both sectional and one-piece tanks.
What are the advantages of GRP over galvanised steel for cold water storage?
GRP offers:
- Corrosion resistance — GRP does not rust, unlike uncoated steel
- Food-grade approval — BS EN 13280 panels are WRAS approved for wholesome water
- Thermal insulation — encapsulated PU foam limits temperature rise, reducing Legionella risk
- Lightweight — easier site assembly with lower structural loading
- Design life of 25–30 years versus typically 10–15 years for galvanised steel Lower maintenance cost — no internal coating required Replacing a corroded steel tank with a Tricel GRP sectional tank also brings the installation into full WRAS and BS EN 13280 compliance.
Case Studies
Selected recent projects
Our GRP cold water storage tanks are specified and installed in healthcare, education, commercial buildings, data centres, high-rise residential, and industrial facilities throughout the UK and internationally.
Murrayfield Stadium, Edinburgh, UK
Two large GRP potable water storage tanks designed, manufactured and installed for Scottish Water Business Stream ahead of a major event. Completed ahead of schedule through close coordination between multiple stakeholders.
HS2’s Greatworth & Chipping Warden Green Tunnels, UK
GRP water tanks (8m × 7m × 4m) manufactured and installed for two HS2 Green Tunnel sites at Greatworth and Chipping Warden, as part of the UK’s largest current infrastructure project.
SEN School, Falkenham, UK
LPCB-approved sprinkler tank solution delivered for a special educational needs school to BS EN 12845 and BS 9251, with installation completed with minimal disruption on a sensitive site.
UK Manufacturing
Two dedicated UK manufacturing facilities
Every Tricel GRP tank panel is manufactured in-house at one of our two UK sites — not imported, not sub-contracted. This means consistent quality, full traceability, and short lead times.
BSA 2022, s.72 — Principal Accountable Person
Tricel Weston — Weston-super-Mare, Somerset
Operating since 1956 as Dewey Waters, this is one of the longest-established GRP cold water tank manufacturing facilities in the UK. The Weston team produces the full range of sectional and one-piece tanks, GRP housings, and biofilters for UK and export markets.
Established
1956 (formerly Dewey Waters)
Products
Sectional, One-Piece, GRP housings
Certifications
WRAS · LPCB · BS EN 13280 · ISO 9001
Markets
UK and international export
Concurrent Duty — HSE ACOP L8
Tricel Lanark — Lanark, Scotland
Formerly Nicholson Plastics, this facility manufactures GRP hot-pressed sectional and one-piece cold water storage tanks to BS EN 13280. It provides additional UK manufacturing capacity with strong coverage of Scotland, Northern Ireland, and Northern England.
Previously
Nicholson Plastics
Products
Hot-Pressed Sectional, One-Piece Tanks
Certifications
WRAS · LPCB · BS EN 13280 · ISO 9001
Markets
UK and international export
Years manufacturing
UK sites
UK made panels
Installation coverage
Testimonials
What specifiers and contractors say
“Just wanted to pass on our compliments and inform you that from our team on site and the client have said how helpful and professional the 2 engineers that have been on site last couple of days
They have been a credit to your company and the installs have been seamless.“
J. Cawsey
Head of Remedials · Rock Compliance
“We have been using Tricel as our preferred tank supplier for a number of years. The level of service provided to ourselves from initial enquiry to contract completion has always been to the highest of standards, from site surveys, quotations and any tank adaptations which we have required, Tricel have provided a quality & competitive service which works within project timescales.”
R. Dunn
Regional Sales Manager · Clearwater Technologies
“Tricel have been the tank supplier on my last 3 projects and have always been a pleasure to deal with. Right through from sales advisor, logistics team, all the way to the tank installers on site, all have a professional, friendly commitment to providing the best service possible.”
L. D’Almeida
Mechanical Project Manager · ESG
Knowledge Hub
Technical resources and guidance
Healthcare Plant Room Design Guide
Plant room layout, maintenance clearances, cold and hot water systems, HTM 04-01 compliance, and commissioning with golden thread documentation.
Legionella Risk Assessment for Building Water Systems
Written risk assessment methodology, risk factor identification, and written control scheme.
Break Tanks and Booster Sets: Design Guide
Hydraulic design, pressure zoning, pump selection, and booster set interface with cold water storage.
Confined Space Entry in Building Maintenance
Legal obligations under the Confined Spaces Regulations 1997 and safe systems for tank cleaning.
QUOTATION
Get a quotation today
Same-day response on standard one-piece tank enquiries. Named project manager assigned to all sectional tank projects. Trade pricing for registered contractors.
WRAS-approved GRP tanks — standard sizes held in stock
Sectional tank survey and installation UK-wide
Emergency replacement — site survey within 48 hours
Full ACOP L8 and BSA 2022 documentation on handover
Building Safety Act 2022 Golden Thread pack included
