Rainwater Harvesting Limited

Rainwater Harvesting Limited, British specialist in rainwater harvesting

Rainwater Harvesting Limited presents itself as one of the UK's leading specialists in rainwater harvesting systems. The company does not limit itself to sales: it also manufactures and markets all types of products linked to this market, and describes itself as a leading supplier of complete packages for domestic use. It serves both individuals and projects that need to specify the right system, and offers telephone support for quotes and technical advice.

What rainwater harvesting is according to the company

The company explains that rainwater harvesting consists of capturing and storing water that would otherwise go down the drains. Water is collected from the roof, filtered, stored in a tank and reused in the home and garden. Among its advantages, the company highlights savings on water bills, greater home sustainability and, in many situations, reduced flood risk by diverting water to a storage tank.

Regarding uses, it distinguishes between outdoor and indoor applications. Outdoors, it mentions garden watering, car washing, cleaning patios, driveways and windows, and filling swimming pools, ornamental ponds and hot tubs. With certain plumbing modifications, the water can also be used indoors for toilets and washing machines. The company estimates domestic consumption associated with these uses: around 35% for toilets, 15% for washing machines and 5% for garden and outdoor uses, a figure that can grow significantly for keen gardeners. It adds that using rainwater reduces limescale build-up in appliances.

Products and systems available

The catalogue is organised into several product and solution families:

• Rainwater harvesting systems, with underground and above-ground variants, and direct feed or gravity feed configurations.
• Tanks: below ground, above ground and wall tanks, with a new range of eleven styles.
• Tank accessories, connectors and fittings, control units, filtration, pipes and hoses, rainwater pumps and irrigation.
• Drainage and flood prevention solutions, including attenuation and SuDS (sustainable drainage systems), alone or combined with rainwater harvesting.
• Waste water treatment and tank cleaning service.
• Garden water butts.

Featured products include the Rain Director gravity-fed rainwater management system, which the company describes as innovative and multi-award winning for dramatically reducing energy use and pump wear compared to traditional systems. It also sells Rain Backup in a Box, a plug-and-play mains water backup for rainwater harvesting systems, and Rain Activ, an attenuation solution that allows rainwater to be discharged on site at a very low rate and is supported by full Micro Drainage calculations.

Regulations and applications in new build

The company highlights the regulatory change in England: the national standards for sustainable drainage systems (SuDS), published in June 2025, give rainwater harvesting top priority as the preferred method for controlling water discharge in virtually all developments. According to its information, this makes these systems a requirement for almost any development and reinforces their usefulness in planning applications. The company also offers percolation tests within its surface water management area.

Technical and advisory resources

The site brings together tools to help choose and install systems: tank size calculator, downloadable brochures and manuals, videos, guides on the differences between direct feed and gravity feed, information for those new to this technology and CPD training. The company also maintains a blog with water news, case studies and answers to frequently asked questions, and publishes content on hosepipe bans and their implications. It has an approved installers programme and a deposit scheme.

Service, stock and visiting the facilities

Rainwater Harvesting Limited states that it holds full stock of underground tanks and complete systems, and offers telephone support for immediate quotes and help specifying the right system for each project. The company invites you to book an appointment to visit its facilities in Peterborough, see the products and talk to its experts. It also has an online shop and a technical support service.

Location and contact

Phone: 01733 405111 · Email: info@rainwaterharvesting.co.uk