Rainwater Harvesting Tank Sizing Guide
Discover how to calculate rainwater harvesting tank capacity, size break tanks , and comply with BS 16941-1:2024. Expert guidance for projects.
Use our online tank size calculator to work out the right sized rainwater tanks for all your rainwater harvesting requirements.
Commercial Rainwater Harvesting Systems
The system collects rainwater in a central below or above ground storage tank and then boosts collected rainwater to an intermediary break tank . We will size your break tank to provide a suitable level of internal storage capacity to meet your peak water demands.

Use our Tank Size Calculator to establish the size of rainwater tank you need to install for the upmost efficiency.
Rainwater Harvesting Calculator
In the UK we refer to the British Standard 16941-1:2024 for guidance on rainwater harvesting. The British Standard gives recommendations on the design, installation, testing and maintenance of rainwater harvesting systems supplying non-potable water in the UK. In terms of calculation of the size of a rainwater harvesting tank the a three tier approach is introduced. 1. Simplified approach for ...
In England and Wales, harvested rainwater cannot legally be connected to potable water systems without approval from Water Regulations Advisory Scheme (WRAS) under the Water Supply (Water Fittings) Regulations 1999. This guide covers the legal framework, realistic collection volumes by region, and how to size a storage tank for UK rainfall ...

Rainwater tanks
Overground, large capacity rainwater tanks from GRAF. Our rainwater tanks hold a lot of water and offer excellent value for money.
Water Tanks from 45 Litres upto 90,000 Litres Tank Fittings & Accessories UK
Rainwater Harvesting Systems

Tanks R Us Stocks a fantastic range from the industry-renowned manufacturer Enduramaxx. Reliable, durable and submersible.
Explore large -scale and commercial rainwater harvesting in the UK, including real-world case studies, legislation, costs, and how businesses can reduce water use and improve sustainability.
Rainwater Harvesting Systems
Rainwater harvesting system options RainCell X50 For light industrial/commercial applications where space is limited or mains water top-up has been specified. RainCell 75H Ideal for plant rooms or where a break tank system has been specified.
Additional Notes on Rainwater Tank Size For Large Manufacturing Plants
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