Domestic Systems Overview
The RainSava domestic rainwater harvesting range cuts household mains water consumption by up to 50% by safely supplying water for toilets, washing machines, and outdoor use.
Combining industry-leading WISY® Vortex or LineAr filtration with a unique high-flow mains top-up unit, the highly reliable range offers options for every property layout.
This includes the budget-friendly Classic direct feed, the smart and energy-efficient Eco-Pro, the header-tank-driven Gravity system, and the unique, WRAS-approved Sigma module, which is ideal for retrofits and above-ground tanks.
Rainsava Gravity
Header Tank System
The Benefit: Delivers incredible energy efficiency by using a dedicated pump and controller to fill a header tank, minimizing pump start-stop wear.
What Makes it Unique: It offers the unique option of manual valves inside the header tank, meaning absolutely no electrical power is required in the loft space. It combines this passive delivery with ground-level maintenance and the signature Wisy Vortex 3-stage filtration system.
Rainsava Classic
Direct Feed System
The Benefit: Delivers pressurized, mains-equivalent water directly to your outlets using a premium automatic pump with built-in start/stop controls and a rapid 44L/min mains top-up.
What Makes it Unique: It pairs on-demand direct pressure with effortless, ground-level filter maintenance and full BS8515 compliance (complete with anti-backflow and rodent guards), delivering pristine water via a 0.28mm Wisy Vortex filter and a floating suction set.
Rainsava Retro-Fit
Above-Ground Sigma System
The Benefit: Engineered for effortless integration, this system features a quiet operation and simple maintenance, making it highly suited for retro-fit setups and perfect for drawing water from above-ground tanks.
What Makes it Unique: It pairs a class-leading low energy consumption with an easy-to-install design that requires no mains water back-up to the main storage tank, all while pending WRAS re-approval for total peace of mind.
Garden Systems
Above or below ground tanks
The Benefit: Provides naturally soft, chlorine-free rainwater that is ideal for plants, ponds and garden use, while reducing mains water consumption and giving you a dependable supply during dry weather.
What Makes it Unique: Combines high-quality WISY Vortex filtration with underground storage and automatic pumping to keep water clean, cool and fresh with minimal maintenance. Available in sizes from 150 to 30,000 litres to suit gardens of almost any scale.
Rainsava Maxima
Light Commercial System
The Benefit: A compact, plug-and-play system for larger homes, delivering reliable pressurised rainwater with automatic mains backup and low running costs.
What Makes it Unique: Combines a 350L break tank, stainless-steel pump, controller and AA air-gap mains top-up in one self-contained unit. Mains water tops up the Maxima rather than the main rainwater tank, making it particularly suited to large or above-ground storage tanks.
Rainsava Eco-Pro
Advanced Direct Feed
The Benefit: Achieves class-leading energy efficiency while upgrading to a heavy-duty, stainless steel multi-stage submersible pump and a dedicated controller for maximum reliability.
What Makes it Unique: It features the premium Wisy® 4-step purification system. This includes a calmed inlet to prevent disturbing sediment and a multi-functional overflow unit with a deep water trap, guaranteeing the absolute highest standard of water quality without anyone ever needing to enter the tank for maintenance.