Redefining Water: The Evolution of Billi Quadra

Launched in 2006, Billi’s Quadra system revolutionised underbench drinking water systems with energy reclaim technology and user-first design. Nearly two decades on, Quadra continues to set the benchmark for efficiency, sustainability and design innovation in residential and commercial water systems.in residential and commercial water systems.

When Billi launched in 1989, the small, Aussie-grown company was bursting into an establishing water filtration market with some pretty groundbreaking ideas on how to galvanise the industry. And they accomplished this ambitious vision by introducing Australia to the first underbench boiling and chilled drinking water system only a few years later. This pioneering launch laid the groundwork for Billi’s future prominence in the market, setting in motion years of innovation and exciting technological and product releases.

One of them was the landmark launch of Billi’s signature Quadra underbench water system in 2006. Pioneering a unique heat energy reclaim system that significantly enhances energy efficiency, at the time of launch, the Quadra range solidified Billi’s reputation as an innovative, environmentally-driven disruptor in the water systems space. And now, almost 20 years on, we take a closer look at the Quadra range to uncover the innovation behind this revolutionary system, understand how it’s maintained its unwavering relevance over the years, and explore the design philosophy that brought it to life in the first place.

THE END USER
“The end user has always been at the heart of our design philosophy,” says David Craggs, Billi’s Head of Research & Development.
“From the meticulous design of our hot water safety labels and the addition of a digital user interface to expanding user controls for temperature settings, perfecting the spout splash dynamics and dispenser design – we’re constantly improving our product design to enhance user experience.”

It’s evident that the very same, user-driven ethos informed Quadra’s mid-2000s launch. While there was quite a lot of innovation happening in the water system space at the time, Quadra introduced some particularly inventive features that directly addressed shifting consumer needs and evolving requirements of the built environment.
In essence, Quadra’s innovative heat energy reclaim system captures and reuses the energy produced during the chilling cycle to preheat the boiling water, leading to significant energy savings and improved efficiency. In addition, Quadra introduced water-cooled technology, which is generally considered more energy-efficient and does not require cupboard ventilation or a cooling fan, making installation easier, preventing the release of exhaust heat into surrounding cabinetry and ensuring much quieter operation.

This noise-reduced, efficient and space-saving underbench design made it easier to integrate into various residential and commercial environments, offering architects and designers at the time a unique opportunity to specify water systems in applications that weren’t an option before.
With such an outstanding fusion of performance, convenience, improved efficiency and energy savings, no wonder that the ripples of Quadra’s momentous launch still influence the water systems landscape to this day.

QUADRA’S ENDURING RELEVANCE

Since the launch, the range has expanded its product family, and now comprises Quadra, Quadra Plus and Quadra Twin Plus. The Quadra provides instant boiling and chilled filtered water, while the Quadra Plus adds a separate sink mixer tap with its own hot and cold-water supply. The Quadra Twin Plus provides boiling and chilled water and features two separate sink mixer taps with hot and cold water.
Designed to work in commercial and residential spaces, the systems boast a selection of refined dispenser options, including XT Touch, XR Remote, XL Levered and the award-winning Multifunction Mixer Tap, launched in 2024 and recognised with a Good Design Award, complemented by a range of versatile contemporary finishes from classic matte white to urban brass and gunmetal grey. In addition, the XL Levered option is available with red and blue coloured levers and braille pads to support vision-impaired users.

This design versatility is also reflected in the varying capacity of each system, showcasing Billi’s commitment to meeting customer needs and ensuring the best possible experience. Specifiers can select an appropriate system depending on the number of users it’s meant to cater to, hourly delivery of boiling or chilled water cups, and a total current draw needed to accommodate the desired operation. Even the temperature of the chilled water can be adjusted between 6°C and 15°C to accommodate individual user preferences. Billi also offers custom service plan options to ensure continuous safe drinking water onsite – with periodic plans available for locations with multiple units, the company provides a bespoke management system for every customer’s needs.

Alongside versatile choice, outstanding quality and excellent functionality – backed by a two-year warranty – Quadra’s environmental profile continues to be the cornerstone of its unwavering relevance. And essential to its sustainability performance is the natural gas refrigerant (R290) – with a negligible global warming potential (GWP), it plays a critical role in the system’s efficiency.
“R290 exhibits exceptional thermodynamic characteristics, enhancing heat transfer efficiency and expediting cooling processes,” explains Fergus Tough, Billi’s Director of Manufacturing Operations. “As a result, R290-powered systems generally demand less energy for temperature control, reducing both energy usage and utility expenses.”
From a health, safety and well-being perspective, the products contain no VOCs or BPAs and Quadra filters are manufactured with bacteria- and biofilm-resistant materials for improved water safety and quality. Plus, both the “red for no, green for go” smart locking technology with visual safety and fault indicators and the clever Splash Free™ technology underscore the systems’ user-centric character.

A WATER-TIGHT SHIP: RELIABILITY, CERTIFIED

It’s very clear that this holistic design continues to be as relevant as when Quadra first launched, and an array of essential sustainability certifications underscores this enduring character.
Billi is a cornerstone member of the International WELL Building Institute (IWBI), and both Quadra and Quadra Plus are Watermark-certified, have Environmental Product Declarations (EPDs) and are certified Gold Level under Global GreenTag standards. This certification not only reflects their commitment to sustainability across the full lifecycle of the product – including energy and water efficiency, reduced environmental impact, low-VOC emissions, healthy indoor environments, ethical manufacturing practices, and responsible sourcing of materials – but also recognises the maximum score the products achieve for Health & Toxicity, further highlighting their potential to support relevant outcomes within existing frameworks.
For architects and designers striving for sustainable building certifications like Green Star, specifying products with recognised ecolabels provides valuable documentation and contributes towards achieving their project goals. For instance, specifying Quadra and Quadra Plus can contribute to achieving the Responsible Products credits in Green Star. In the Green Star Buildings rating tool, the RPV of 16 allows them to contribute to achieving credits in the Responsible Systems category, placing them in the Exceptional Performance tier with a required minimum RPV of 11 at the product level.

This potential to help architects and designers achieve their sustainability aspirations is underscored by Global GreenTag’s assessment of Quadra ranges’ compliance as “ahead of the market,” positioning them in the top 35% of Global GreenTag’s internal ranking.

STAYING AHEAD OF THE MARKET, LOCALLY AND GLOBALLY

With the “ahead of the market” Global GreenTag compliance under Quadra and Quadra Plus’ belt, Billi, which has just started its global expansion, is looking at a much more complex market of international regulations to adhere to.

“It adds another layer of complexity when we look at sustainability as a manufacturer,” says Royce Tan, the company’s Brand Marketing Coordinator. “It highlights the ‘duty of care’ and our own global impact as an international conglomerate.” With such a strong commitment to industry-wide collaboration, a data-driven approach to innovation and a constant push to advance sustainability ambitions locally and abroad, what’s next for Billi and for the Quadra systems?
“The latest units are based on the consistent success of an all-in-one underbench water filtration solution, like our flagship model, the Quadra,” David says, explaining that the last iteration of the Quadra range, Quadra Sparkling, has now evolved into the OmniOne. “We’ve improved the touchscreen interface in OmniOne, introducing better customisation controls and even safety mitigations in the unit,” he continues. “Now, the new XT Motion will combine the convenience of buttons with motion-sensor controls for all functions on the sides, back and top to enable more convenient, inclusive and hands-free operation, supporting disability access and helping ensure infection control.”

As Billi’s intuitive refinements continue to improve the user experience over the coming years, another challenge lies ahead, and the company is facing it with readiness, curiosity and optimism. “We are approaching the energy efficiency limit of unit design,” explains David. “That’s because it’s impossible to increase the capacity without increasing energy use
or altering the size of the system. So, for us, this will be the most exciting challenge, once we’ve exhausted the limits of conventional appliance design
Based on the Quadra system’s trajectory to date, it’s safe to assume that Billi is most certainly going to rise to the challenge, and we can expect continued market-defying innovations.

Sustainability E-Book 2025 

BRANKO MILETIC, EDITOR 

Architecture & Design Australia