Rainwater Harvesting Tanks


Rainwater harvesting tanks have emerged as a critical solution for sustainable water management, particularly in areas of water scarcity. The concept revolves around collecting, storing, and using rainwater for various applications, ranging from irrigation to potable uses.

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What is a Rainwater Harvesting Tank?

Rainwater harvesting tanks serve as the primary storage units for collected rainwater. Sectional tanks are a popular water storage solution for rainwater harvesting. Our robust modular tanks are particularly suitable for premises retrofitting rainwater harvesting systems and, over the years, have become a popular concept within the UK to ease water shortages and reduce water costs.

Benefits of Rainwater Harvesting Tanks

At Tricel, we have years of experience working with rainwater specialists. We can provide water storage solutions for drinking water (potable water), food preparation, irrigation, and sanitation, amongst other applications. We specialise in both boosted and gravity systems, and for specific sectional rainwater tank applications, please email our expert sales team with your exact requirements, and we can quote to suit.

  1. Water Conservation

Rainwater harvesting significantly lessens the strain on local water supplies, substantially conserving freshwater resources. This is especially beneficial in regions with limited water availability.

  1. Cost Savings

Property owners or businesses can considerably lower their water bills by utilising harvested rainwater for non-potable purposes such as irrigation and flushing toilets. Over time, the savings can offset the initial investment in the harvesting system. A property with an installed rainwater harvesting system can save between 40% and 50% on their water bills.

  1. Environmental Impact

Reducing runoff by collecting rainwater helps reduce the risk of flooding and erosion. Moreover, it decreases the burden on stormwater systems, which can be overwhelmed during heavy rains.

  1. Quality of Water

Rainwater is generally free from pollutants found in ground or surface water. When properly filtered and treated, it can be used for drinking and cooking, providing a cleaner alternative to other water sources.

rainwater harvesting tank
rainwater harvesting tank installation

Use Cases for Rainwater Harvesting Tanks

Rainwater harvesting tanks are versatile and can be utilised in various scenarios, including:

  1. Residential Properties

Residential properties can install rainwater tanks on the roof to collect water. This water can be used for potable and non-potable applications such as drinking water, gardening, and flushing toilets.

  1. Commercial Buildings

Businesses can benefit from large-scale rainwater harvesting systems to reduce water usage and enhance sustainability practices. This is particularly useful for office buildings, hotels, shopping centres, and industrial facilities.

  1. Agricultural Applications

Farmers can use harvested rainwater for irrigation, reducing their reliance on groundwater and ensuring a more sustainable farming practice.

Supplying the Biggest Projects

With vast experience, we have completed various projects across different commercial businesses. No project is too big or complicated for us at Tricel. Every project is different, and we have installed GRP sectional water tanks where space was restricted to a minimum and other structural factors were a concern.

Installation Locations for Rainwater Harvesting Tanks

The installation location of rainwater harvesting tanks plays a crucial role in the efficiency and effectiveness of the system. Here are some common installation locations:

  • Above-Ground Installations

Above-ground tanks are easy to install and maintain. They are ideal for locations where space is not restricted and can be integrated into the surroundings.

  • Loft Installations

Loft tanks are suitable for properties with limited outdoor space. They take advantage of unused attic space, though structural integrity must be assessed to ensure the loft can support the water tank’s weight when full.

  • Basement Installations

Basement tanks utilise space that might otherwise go unused. They offer easy maintenance access and can be integrated into existing building designs.

Ideal Solutions for Rainwater Harvesting

Sectional tanks and TIF tanks are ideal solutions for rainwater harvesting due to their robust design and versatility.

  1. Sectional Tanks

Sectional tanks are modular systems that can be palletised and assembled on-site, making them suitable for large-scale installations where transporting pre-assembled tanks would be challenging. Our sectional tanks offer high capacity and durability, which is ideal for commercial and industrial applications.

  1. TIF Tanks

Totally internally flanged tanks with no base-to-side joints or external corner joints – making them 100% buildable from the inside, unlike other internally flanged or externally flanged tanks.

Case Study: Rainwater Harvesting Tank Installation

A notable example of a successful rainwater harvesting system is the installation carried out by Tricel. In this project, a large-scale rainwater harvesting tank was installed at a commercial facility to collect and store rainwater for non-potable uses.

Project Overview

Our client required a rainwater harvesting tank with an actual useable capacity of 5,200 litres. From the outset, the brief for this new housing development rainwater tank was very detailed. The plantroom became more problematic on the installation day as it was 250mm short in one direction.


Given the limited space in the plantroom, an L-shaped TIF tank was specified to ensure safe and correct installation and maintenance. Thanks to our versatile panels, it was possible to swap out two 500mm panels for a 750mm section, and this reduced the initial loss of capacity by 50%.


Rainwater harvesting tanks offer numerous benefits, including water conservation and cost savings, whether for residential, commercial, or agricultural use. By utilising natural rainfall, you can significantly reduce your water consumption and costs while contributing to environmental conservation. If your next project requires a water tank suitable for rainwater harvesting, email your project details to our sales team at websales@tricelwater.co.uk

GRP sectional tank sitting on base steelssectional tank drawing
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