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GRP One Piece Tanks

Our range of one piece tanks range from 43 litres to 24,000 litres. These are also known as Cistern Tanks.

GRP One Piece Tanks


Nicholson Plastics one piece tanks are constructed from GRP and are an economical alternative for cold water storage.

They are available in a variety of sizes ranging from 43 litres to 24,000 litres in both insulated and un-insulated models and are delivered nationwide within a couple of days. Cistern Tanks are manufactured for both internal and external water storage solutions. These cold water one piece storage tanks are ideal for restricted spaces and can be custom built to ensure ease of installation.

NP One Piece Tank ANP100

Manufacturing since 1968 we have extensive experience in water storage solutions, don’t hesitate in giving us a call to discuss your water storage requirements. We have a specialised sales team ready to answer any queries you may have. Contact us today for a no-obligation quote.

If our standard tank sizes are not what you are looking for we provide a custom moulding service to fit the exact dimensions/space required. Condensation trays are available for all One Piece Tank Sizes.

Nicholson Plastics one piece water storage tanks are manufactured to European Standards and are WRAS approved. Certifications and documentation for each tank is available for download.

Features and benefits of our One Piece Tanks

  • Available from a standard range of one piece tanks or made to order
  • Pre-insulated one piece tanks are available with insulation in varying thicknesses
  • Fully self-draining one piece water storage tanks are available
  • All one-piece tanks comply with all relevant British Standards and Water Regulations
  • All materials used have been approved by WRAS (Water Regulation Advisory Scheme)
  • Standard capacities are available from 30 litres to in excess of 9,000 litres
  • Can be supplied in any BS5252 or RAL colour
  • Virtually ZERO maintenance
  • Can be supplied as Two-Piece for restricted access
  • Full range of connections/ancillary items available
  • All supplied within the scope of our BS EN ISO 9002 1994 Quality Assurance Registration
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View a select range in our Online Store

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Case studies

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Site Assessment for replacing a leaking water tank

Company name: CHC Ltd
Product: Site visit, Tank supply & installation – Externally Flange tank with a packaged variable speed booster set
Tank dimensions & capacity: 2m x 1m x 1.5m, 3,000 litre water tank installation

13978_Addiewell_130508 004

Supply & Installation of a sectional water tank

Company name: Cairn Lodge Hotel
Product: Sectional water tank, pump set & enclosure
Tank dimensions & capacity: 2m x 1m x 1.5m, 3,000 litre water tank installation

13978_Addiewell_130508 004

Manufacture, delivery, installation and removal of their existing water tank system.

Company name: Cross house Hospital Scotland
Product: Two sectional cold water tanks
Tank dimensions & capacity: Tank 1: 12m x 9m x 2m | Tank 2: (216,000 Litres Nominal capacity)