en.Wedoany.com Reported - GRAF UK has launched a range of award-winning AA rainwater harvesting systems, designed to maximize the use of free rainwater rather than relying on mains water top-ups.

Unlike most rainwater harvesting systems that use mains water to replenish underground storage tanks, the AA series connects mains water directly to the pipework rather than through the tank, ensuring the full capacity of the tank is used for storing rainwater. This design complies with Section AA of the UK Water Supply (Water Fittings) Regulations 1999, which requires an air gap as a non-mechanical backflow prevention measure. Non-compliance with these regulations can lead to enforcement action, as they are critical for preventing water contamination.

The series offers high flexibility, requiring only two systems to meet demand: the standard AA Eco-Plus and the premium AA Silentio. The tanks are sustainably manufactured from 100% recycled plastic and range in capacity from 1,500 to 7,500 liters.

Both systems are designed for non-potable uses within the property, providing efficient rainwater supply for toilet flushing, washing machines, garden irrigation, and general outdoor cleaning.

When stored rainwater levels are too low, the system automatically switches to mains water via an integrated tank beneath the pump unit, ensuring uninterrupted supply without replenishing the main tank. By separating mains water from the tank, the system retains the full capacity for collected rainwater, maximizing overall efficiency.

Rainwater is collected from the roof and enters the underground storage tank via downpipes. These tanks are designed for shallow installation and easy access, making them particularly suitable for renovation or retrofit projects. As rainwater enters the tank, it passes through GRAF UK's multiple award-winning high-performance filter, ensuring the stored water is free from leaves and debris.

An external pump and control unit installed within the property draws water from the tank via a floating suction pipe as needed, ensuring water is taken from the cleanest layer just below the surface. The external pump unit includes an AA class (Family Type) air gap, meeting water supply regulation protection requirements.

The tanks feature a flat, shallow profile and can be backfilled with gravel instead of concrete, helping to reduce excavation depth and installation time. Standard configuration includes free UK mainland delivery, offering added value.

Both the AA Eco-Plus and AA Silentio systems are equipped with telescopic dome shafts and pedestrian covers, with an option to upgrade to vehicle-rated covers suitable for driveways or traffic areas. The AA Silentio system also features a reversible flow filter and a digital display, allowing homeowners to accurately see the remaining rainwater volume in the tank.

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