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One Piece Tanks

Domestic, Commercial, New Sizes Available!

One piece tanks are suitable for a versatile range of applications. Our one-piece tanks (or cisterns) are suitable for the storage of water up to 55°C using standard resin and up to 80°C using high-temperature resin. Specialist resins are also available that enable the storage of mild and aggressive chemicals.

Tank Sizes

30 Litres – 12,000 Litres

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Download the Brochure

Full Technical Information

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Capacity Types

Capacity types explained

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Knowledge Hub

Visit our Knowlede hub

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One piece grp tank

One Piece GRP Water Tanks

Specifications

  • Insulated or uninsulated options available depending on the application.
  • Standard tank colour is Grey 00-A-05, we can supply in any BS5252 or RAL colour to suit your requirements
  • Twin Compartment options available to provide continuous supply during maintenance periods.
  • Internal isophthalic gelcoat surface to prevent bacterial growth
  • Manufactured in accordance with BS EN13280

HCFC & CFC free encapsulated Insulation

  • 25mm – 0.85 w/m2 Deg C
  • 50mm – 0.40 w/m2 Deg C
  •  75mm – 0.2 w/m2 Deg C

Benefits to One Piece GRP Tanks

 

  • A maintenance free and cost-effective storage solution
  • Corrosive free – Virtually ZERO maintenance
  •  Water Regulations UK approved products
  • Can be supplied as two-piece for restricted access
  • Full range of connections/ancillary items available
  • Fully self-draining tanks are available
  • Close fitted sealed lid
  • Air gaps to suit any application
  • ISO quality management system
  • Fast delivery throughout the UK
GRP one piece tank
Calculator Tools

Use our popular tools to help calculate your tank size

Calculator Tools

Use our popular tools to help calculate your tank size

dewey waters water tank calculator tools
WRAS Approved one piece GRP tank

Fully Certified Manufacturer 

Dewey Waters is an accredited &  certified GRP water tank manufacturer.

We pride ourselves on operating to the highest professional standards. We are committed to supplying our customers with genuinely market-leading, high-quality products, and always strive to provide the most appropriate solutions to fulfil clients’ needs.

Our product range and manufacturing processes are continually updated and optimised to ensure that we offer the most up-to-date products and services – improvements that are driven by a combination of legislative change, fluctuating market forces, and consumer demand.

To ensure consistent levels of product quality, we regularly monitor our procurement and usage of raw materials, whilst also striving to adopt the most efficient production methods – using natural resources in all of our manufacturing processes where possible.

TIME TO SHARE THE KNOWLEDGE

Visit our Knowledge Hub for supporting documentation, technical
data, downloads and more..

Two Part Tanks,

Lids, Air Gaps & Divisions Available

Dewey Waters supply a variety of fittings including float valves, overflows, warning pipes and threaded flanges.

We can also provide most of our range with a raised float valve housing which will increase the usable volume
of water.

Our range of tanks varies in size from 30 Litres to 12,000 Litre capacity.

Two-Piece Tanks
Our tanks can be manufactured in two parts with a flange running horizontally through the middle to assist with
access requirements.

Division
We can supply most of the range with a division used to give the tank two compartments.

This option allows for one side of the tank to be drained down for maintenance while the other side is still live in accordance with BS EN806 Part 2.

Air Gaps
Air gaps are a requirement by the water authorities to ensure that there is a clear break between the mains supply and a building or a device to prevent any contaminated water from getting back into the mains supply.

Cat 5
We can supply our tanks with the following; AA fluid category 5, AB fluid category 5, AF fluid category 4 and AG fluid category 3.

 

 

One piece tank lid

Case Studies

Our latest projects / See all case studies

Hotel cold water storage tank

LONDON HOTEL

Water Storage Tank Installation

Supply & install reduced capacity wet riser
tank & potable cold water storage tank

School Sprinkler Tank Installation

SCHOOL SPRINKLER TANK

Water Storage Tank Installation

Manufacture & Install a Hot press sectional
water storage tank with externally flanged
sides and base levelling steels.

dairy-crest-water-tank-install

SECTIONAL WATER STORAGE TANK

Water Storage Tank Installation

Manufacture & Install a Hot press sectional
water storage tank.

Deeside College Water Tank Installation

COLLEGE WATER TANK INSTALLATION

Water Tank Installation

To supply, deliver, offload, position, and
install a GRP hot press externally
flanged sectional tank.

Hotel cold water storage tank

LONDON HOTEL

Water Storage Tank Installation

Supply & install reduced capacity wet riser
tank & potable cold water storage tank

School Sprinkler Tank Installation

SCHOOL SPRINKLER TANK

Water Storage Tank Installation

Manufacture & Install a Hot press sectional
water storage tank with externally flanged
sides and base levelling steels.

dairy-crest-water-tank-install

SECTIONAL WATER STORAGE TANK

Water Storage Tank Installation

Manufacture & Install a Hot press sectional
water storage tank.

Deeside College Water Tank Installation

COLLEGE WATER TANK INSTALLATION

Water Tank Installation

To supply, deliver, offload, position, and
install a GRP hot press externally
flanged sectional tank.

Priory Mechanical Services
“The installation process was smooth and very efficient.

We will continue to use Dewey Waters as the service we receive is always excellent.”

Product supplied: Sectional Tank HLU TIF 2.25m x 1.00m x 2.00m

★★★★★

Priory Mechanical Services

DEWEY WATERS FEATURES

Specialising in the manufacture of both one piece and sectional cold water storage tanks, our experience ensures that we are able to accommodate virtually all client requirements.

On time Delivery

Placing and receiving your order is a straightforward, hassle-free process.

Technical Advice

We provide high levels of technical knowledge, product choice and customer service.

Fully Certified

Dewey Waters is an accredited & certified GRP water tank manufacturer.

Experts Installation

60 years’ industry experience in both Water Storage and GRP industries.