Rainwater
Wall
The Rainwater Wall transforms rainwater harvesting into architecture. Each panel stores 1,000 litres while creating a beautiful screen, garden divider or boundary fence. Fix it to a wall or install it freestanding. Modular, durable and designed for modern landscapes.
How does it work?
Rainwater harvesting in 3 steps
Collect, filter and use the water from the roof. Simple logic, high efficiency.
Collect
Rainwater is directed into the system via the roof drain. It connects easily to the existing infrastructure.
Filter
Leaves, sand and particles are caught by the inlet filter. Clean water is transferred to the tank.
Use
From garden irrigation and laundry to vehicle washing, solar panel cleaning, livestock watering, toilet flushing, and industrial processes, rainwater has countless practical applications.
What it Does
One System. Six Applications.
Garden Irrigation
pH-neutral rainwater, gentler on plants than treated mains water. The natural choice for premium landscaping.
WC & Grey Water
Reduce your mains-water reliance in the highest-traffic areas of your home or commercial building.
Vehicle & Solar Washing
Spot-free cleaning for cars, windows, and solar panels. Pure rainwater leaves no limescale residue.
Livestock & Animal Water
Pure, safe, and consistent. A trusted supply for animal drinking water on farms and rural estates.
Washing Machines
Soft rainwater reduces detergent consumption and extends machine life, while cutting your water bills.
Industrial Process Water
On-demand access for demanding industrial applications, cooling, cleaning, and site operations.
Applications & Environments
Built for Every
Environment
From a single garden panel to a 50-unit industrial installation, the Harves Rainwater Wall works wherever water is needed and appearance matters.
Home & Garden
Residential Gardens
Your landscape deserves better than an ugly plastic drum. A sleek, sculptural wall that saves water while defining your garden's aesthetic.
Commercial
Hotels & Hospitality
Visible sustainability. Showcase your commitment to resource management with a system that looks as professional as your facility.
Agriculture
Farms & Estates
Scalable, high-capacity storage that fits your footprint. Whether it's livestock, crops, or estate grounds, expand as your needs grow.
Industrial
Industrial Facilities
Robust, reliable water access for processes and site maintenance. High-quality LLDPE that survives the heavy-duty realities of industrial work.
Why Harves
Three reasons
it's for you
The market is full of tanks. There is only one Rainwater Wall. Here is why it is the only choice worth making.
01 - Stylish
The antithesis of the ugly tank
Every other rainwater solution is designed to be hidden. The Harves Rainwater Wall is designed to be seen. A precision-crafted architectural panel that enhances your property rather than diminishing it.
"Designed to be seen, not hidden."
02 - Modular
Scale without limits
Connect 1 to 50+ panels with standard pipework and globe valves. Start with a single 1,000-litre garden panel and grow into a 50,000-litre commercial installation, the same system, the same aesthetic, at any scale.
"One system. Any scale."
03 - High Quality
Built to outlast everything else
6–7mm UV-stabilised LLDPE walls, 90 internal tension ribs, a 13cm freeze-expansion void. This is not a barrel with a lid, it is a precision-engineered structure built to withstand impact, freeze cycles, and a decade of daily use.
"Tested. Proven. Built to last."
Projects
The Form in Context
Unlike buried tanks or concealed barrels, the Rainwater Wall is displayed, a considered design element in your property.
Project · Wall-Mounted Installation
Underground Car Park
25 Rainwater Wall panels installed and operational, wall-mounted throughout an underground car park.
Project · Product Close-Up
The Facade
Fifteen units mounted across an outdoor retaining wall, transforming utility into a striking, elegant facade element.
Project · Commercial Installation
Built to Grow
Built to grow: Starting with one unit, this company's Rainwater Wall now scales effortlessly to meet their increasing needs.
Project · Residential Freestanding
Twin Panel Freestanding
Two Rainwater Wall panels installed freestanding side-by-side on a green lawn, fed by a downspout from the building, a self-supporting architectural rainwater storage solution.
Project · Residential Wall-Mounted
Gravel-Side Wall Mount
A modular rainwater harvesting unit wall-mounted along a residential siding on a gravel pad, with a secondary unit scaling the system further down the wall.
The Product
Anatomy of a
Masterpiece
The Rainwater Wall isn't a tank hidden in a corner — it is a precision-engineered architectural panel. Fix it to a wall or stand it freestanding as a garden screen or fence. Either way, it stores 1,000 litres per unit and becomes a defining feature of your outdoor space.
Wall-Mounted or Freestanding
225×175×30cm panels fix flush to any exterior wall, or stand independently as a garden screen, boundary fence or privacy divider.
90 Internal Support Ribs
Near-90 internal tension ribs bond front and rear walls, creating a structure that withstands both water pressure and freeze expansion.
Freeze-Resistant
A 13cm expansion void at the top, combined with 6–7mm wall thickness, allows ice to expand safely without cracking the panel.
Built-In Leaf Filter
Integrated inlet filter blocks leaves, grit, feathers and debris. Clean water only enters the storage chamber.
Fully Modular
Connect 1 to 50+ panels with standard globe valves and pipework. Scale your capacity as your needs grow.
UV-Stabilised LLDPE
Linear Low-Density Polyethylene with UV inhibitors. Resists algae, colour fade, and UV degradation for 10+ years.
Technical Specifications
Precision Engineered
Every specification is a deliberate engineering decision. From the 13cm freeze-expansion void to the near-90 internal support ribs, nothing is arbitrary.
Ships with Mounting Hardware
Every panel ships with twisted metal brackets, stainless fixings, and a full installation diagram.
Standard Plumbing Connections
Connects to any existing 110mm downpipe. A plumber can complete installation in a single day.
Uses: Garden to Industrial
Approved for irrigation, toilet cisterns, vehicle washing, window cleaning, industrial process water and solar panel cleaning.
Installation
Two Ways to Install.
One Versatile System.
The Rainwater Wall is engineered for total flexibility. Mount it flush against a building façade, or install it freestanding using standard steel posts set in concrete, no specialised groundwork required.
Wall Mount
Install the Rainwater Wall flush against any building exterior. The slim, architectural profile sits flat against the wall surface, functioning as a rainwater-storing façade element that integrates seamlessly with modern architecture, no footprint lost from your outdoor space.
- Flush, space-saving installation against any wall
- Functions as an architectural façade element
- Ideal for residential and commercial buildings
Standalone
Mount the Rainwater Wall independently using standard steel posts (80mm × 40mm) set into concrete footings (300mm diameter × 600mm deep). Perfect for gardens, allotments, boundaries, and screens, the system becomes a freestanding architectural element anywhere on your property.
- Standard steel posts (80mm × 40mm) in concrete
- 300mm × 600mm footing — no specialised groundwork
- Use as a garden screen, divider, or boundary fence
Impact Calculator
Measure
Your Impact
The UK receives between 600mm and 1,150mm of rainfall annually depending on your region. Enter your roof area to discover how many litres you could be harvesting, and how many panels you need.
Annual rainfall: 885mm
Annual Harvest Potential
Based on 80m² roof × 885mm rainfall × 80% efficiency
Recommended Panels
Sized to store ~12% of your annual harvest for seasonal use
Estimated Annual Saving
Based on UK average water tariff of £3.50/m³ (Thames Water, 2024)
CO₂ Reduction
Reduced demand on energy-intensive mains water treatment
FAQ
Common
Questions
Everything you need to know before you buy. Can't find your answer? Get in touch and we'll respond within one working day.
Ask a QuestionEnquire
Begin Your
Journey
Whether you're purchasing a single panel or specifying a multi-unit array for a commercial project, our team provides a full site survey, capacity calculation and installation service.