Rainwater Harvesting Systems

Which of our rain water collection systems and water tank combinations best suits your rain collection needs, reduce water bills and contribute to environmental sustainability.

Why Harvest Rainwater?

As water resources face increasing pressure from climate change and growing demand, rainwater harvesting offers a practical and sustainable way to reduce reliance on mains water across a wide range of applications. Whether for garden use, property maintenance, or commercial environments, harvesting rainwater provides both environmental and economic benefits.

• Reduces reliance on mains water
  By capturing and reusing rainwater, homes, businesses and commercial sites can significantly reduce their dependence on mains supply. During periods of drought or water restrictions, having a stored water source helps maintain continuity for essential tasks such as irrigation, cleaning, and washdown.
• Lowers water bills
  Rainwater harvesting can deliver immediate and long-term cost savings. Using harvested rainwater for non-potable applications such as irrigation, cleaning, toilet flushing and laundry reduces demand on mains supply. For commercial users, this can also lead to meaningful reductions in ongoing operational water costs.
• Environmentally responsible
  Rainwater harvesting helps conserve water resources and reduces pressure on local infrastructure. Lower mains water usage means less energy is required for treatment and distribution, helping reduce overall carbon impact. Capturing rainwater also reduces surface runoff, supporting better drainage and lowering the risk of localised flooding.
• Designed for a Range of Applications
  Our rainwater harvesting systems are designed to support a wide range of uses, from simple garden watering through to more demanding commercial applications. Typical uses include:
  • Garden and landscape irrigation
  • Vehicle and equipment cleaning
  • Outdoor washdown
  • Commercial grounds maintenance With systems tailored to different levels of demand, it’s easy to select a solution that matches both your application and the scale of your water usage.

Choose the Right System for your application

Our rainwater harvesting range is designed to match different levels of use:

• Stream – Simple, effective solution for garden use
• Cascade – Enhanced performance for gardens and small commercial applications
• Torrent – High-performance system for home, garden and larger commercial environments

Stream Rainwater Harvesting System

A simple solution for garden use

Ideal for everyday outdoor applications such as irrigation, hose-fed watering and general cleaning.

Typical applications:

• Garden irrigation
• Car washing
• Outdoor cleaning
• Greenhouse watering

Key components: Best One Pump, Rodent Guard, Patronen Filter, Pump Turret

Recommended tank size: 1,000 – 2,000 litres

View the system

Cascade Rainwater Harvesting System

Enhanced performance for gardens and small commercial applications

Designed for users who need improved water quality and increased performance for more demanding environments.

Includes features such as a calmed inlet and floating intake to help maintain cleaner, fresher stored water, along with a more powerful pump for higher usage demands.

Typical applications:

• Garden and landscape irrigation
• Larger gardens and grounds
• Bowling greens
• Communal landscaped areas
• Light commercial irrigation

Key components: P Series Pump & Float Switch, Rodent Guard, Patronen Filter, Calmed Inlet, Pump Turret, Pump Lifting Chain, Floating Intake

Recommended tank size: 2,000 – 3,000 litres

View the system

Torrent Rainwater Harvesting System

High-performance system for home, garden and commercial applications

A direct pressure system designed to deliver a reliable, pressurised water supply for higher-demand environments.

Suitable for both external and internal non-potable applications, Torrent provides consistent performance where water usage is greater or more continuous.

Typical applications:

• Garden and landscape irrigation
• Commercial grounds maintenance
• Washdown applications
• Toilet flushing
• Washing machine supply
• Large greenhouses and landscaped areas

Key components: B Series Pump & Float Switch, Rodent Guard, Patronen Filter, Calmed Inlet, Pump Turret, Pump Lifting Chain, Floating Intake, Top Up Controller

Recommended tank size: 3,000 – 5,000 litres

View the System

Select The Ideal Water Tank for your System

Choosing the correct tank capacity is essential to maximise the performance and efficiency of your system.

Our Rainwater Harvesting Calculator provides a tailored estimate based on your roof size, location, and average rainfall, helping you select the most appropriate tank for your needs: The numbers presented in the above table are based on average UK rainfall so are indicative only. Our free online rainwater harvesting system calculator can provide a more accurate and individual assessment of how much rainfall your roof in your town could collect. Accordingly, the recommended tank size will be more accurate too as its tailored to your roof and your exact UK location:
https://atlantistanks.co.uk/rainwater-harvesting-calculator/

Potential Savings

Rainwater harvesting can deliver significant long-term savings by reducing reliance on mains water.

For example:

• A typical 3-bedroom property could reduce water demand by up to 50%, saving approximately £250–£300 per year
• Larger properties with higher usage could save £400–£500 annually

Actual savings will vary depending on factors such as roof size, rainfall levels, water usage and tank capacity. Our calculator provides a more accurate, tailored estimate based on your specific situation.

Installation and Maintenance

Rainwater harvesting systems are designed to be straightforward to install and maintain.

Correct installation ensures efficient operation, while regular maintenance such as checking filters, inspecting components and cleaning tanks helps maintain long-term performance and reliability.

Frequently Asked Questions

Answers to common questions about rainwater harvesting systems.

1. What is a rainwater harvesting system?

A system that collects, filters and stores rainwater for reuse in potable and non-potable applications.

2. How does a rainwater harvesting system work?

Rainwater is captured from a roof, filtered, stored in a tank and then pumped to where it is needed.

3. Can it be used in commercial environments?

Yes, systems can be used across both small-scale and larger commercial applications depending on specification.

4. Is rainwater suitable for drinking?

No, rainwater is typically used for non-potable applications unless specifically treated.

5. How much maintenance is required?

Maintenance is minimal but important, including regular checks, filter cleaning and occasional tank cleaning.

6. Do I need planning permission to install a rainwater harvesting system?

In most cases, planning permission is not required for installing a rainwater harvesting system. However, it’s always best to check with your local planning authority to ensure compliance with any specific regulations.

9. How much water can I collect with a rainwater harvesting system?

The amount of water you can collect depends on several factors, including the roof area, rainfall levels in your region, and the capacity of your storage tank. As a rough guide, a system can collect approximately 0.5 to 0.8 litres of water per square metre of roof area per millimetre of rainfall.

10. Can I retrofit a rainwater harvesting system to an existing property?

Yes, rainwater harvesting systems can be retrofitted to existing properties. The installation process may vary depending on the property layout and the system’s complexity.

11. Are there any grants or incentives for installing rainwater harvesting systems in the UK?

There are no specific national grants for rainwater harvesting systems, but some local authorities may offer incentives or support. Additionally, installing a rainwater harvesting system can lead to savings on water bills, providing a financial incentive.

12. How environmentally friendly is rainwater harvesting?

Rainwater harvesting is an environmentally friendly practice. It reduces the demand on mains water supplies and helps manage stormwater runoff, which can reduce the risk of flooding and erosion.

13. What types of rainwater harvesting systems are available?

There are two main types of rainwater harvesting systems: direct and indirect. Direct systems pump the collected water directly to where it’s needed, while indirect systems store water in a tank and then pump it to where it’s required. Both types can be further categorised into gravity-fed and pumped systems.

14. Can rainwater harvesting systems be used in commercial properties?

Yes, rainwater harvesting systems can be installed in commercial properties. They can provide significant water savings and contribute to sustainable business practices.

Get In Touch

We’re here to guide you when choosing the rainwater collection system and water tank combination that’s right for you and your property. Call us today on 0330 999 1111 or write to us at [email protected].

Further Reading:

• Rainwater Harvesting: Accessible Water All Year Round
• Rainwater Harvesting – Using Rain to Save Money on Water Bills
• Our Changing Climate Means Changing How We Deal with the Rain
• Underground Tanks for Rainwater Storage
• Rainwater Harvesting System Funding Available Now
• Wasting Rainwater – Like Letting Money Run Through Your Hands
• Don’t Get Caught High and Dry this Summer – Harvest Rain Now and Water your Garden all Year
• Join The Rainwater Revolution
• New Water Laws – It’s Time for Solutions
• Scottish Water’s Surface Water Policy Leads the Way to Innovation
• Surface Water Drainage and Climate Change – Facts & How You Can Help
• Your Water is Running Out
• World Water Day 22nd March 2022 | What is World Water Day