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Based in Malaysia, Green Master Harvest Sdn Bhd (1079627-D) (which is better known for its green-technology brandname Synergy Contract) is the creator of its flagship product, the first wall-mounted and zero-carbon rainwater harvesting system, Voda.

As a rainwater-harvesting specialist, Green Master Harvest designs and supplies rainwater harvesting systems for various projects from landed residential, high rise to consumers’ individual existing homes. Backed by its architectural unit, the Group also offers rainwater-harvesting advisory/consultations. 

To date, Green Master Harvest has served a diverse range of clientele comprising property developers, architects, engineers, corporates and consumers in fulfilling their water-conservation intentions.

Throughout its work, its approach is consistent – which is to provide clients high-quality water saving solutions that are practical, cost saving, eco-friendly and stylish.

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Our Philosophy

Setting the scene for a better tomorrow

Green Master Harvest fully embodies its vision of providing efficient solutions and is willing to go the extra mile today for a better tomorrow. We believe that addressing deficiencies in the market begins with not just a great idea, but also a deep understanding of what is lacking. We contrive to make a lasting impact, and produce to make it happen with our innovative designs and manufacturing systems that translate into smarter, more affordable solutions for consumers. Transforming creative ideas into actual production is achieved via our emphasis on research and development.

Our flagship product, the revolutionary and patented Voda Rainwater Harvesting System (Sistem Penuaian Air Hujan SPAH), is one such example of our innovative products. To date, Voda is installed in various states across Malaysia, including SPAH-compulsory states such as Selangor (Klang Valley), Johor, Malacca, Perlis, Perak and Kelantan. Voda is only the first of more to come as we fulfill our long-term aspirations of offering more life-changing solutions to tackle existing inefficiencies in the market.

While rainwater harvesting can solve water crisis, you need an electric pump to harvest rain. It didn’t make sense to me to save water but use electricity. That was what compelled me to create Voda.

Sit Heng Yeen


Voda’s inventor and an architect by profession, Sit Heng Yeen, received his education at the prestigious Architectural Association of London.

Sit’s idea of a practical rainwater harvesting system came about when his architecture submissions which weren’t equipped with such systems were rejected by the state council. This was following the amendment made to the Malaysian’s Uniform Building By Law in 2012 requiring newly built detached buildings, bungalows and semi-detached bungalows be equipped with rainwater harvesting systems.

Given the lack of practical systems in the market coupled with Sit’s deep passion in problem solving, he undertook a challenge. After extensive research & development and design works, he invented and patented the Voda Rainwater Harvesting System as a solution for his clients’ new developments.

He later founded Green Master Harvest Sdn Bhd, alongside a few partners, to make his invention available to the masses. He leads research & development efforts, rainwater harvesting advisory and oversees manufacturing operations of Green Master Harvest.


Pui San plays a vital role in Green Master Harvest as she spearheads Business Development & Marketing initiatives as well as handles Finance matters of the organisation.

Prior to Green Master Harvest, she has assumed finance and business roles in multinational corporations Ernst & Young and General Electric.

More notably, she served as a senior credit rating analyst in Malaysia’s leading credit rating agency, RAM Rating Services Berhad where she spent the majority of her corporate career and where she gained wide exposure to businesses in various industries.

Pui San is an Association of Chartered and Certified Accountants (ACCA) holder. She finished the professional paper with a First Class Honors in Bachelor Science of Applied Accounting.

The quantum is scary. If an average person flushes 5 times a day, and an average home has 4-5 person and each flush is 6-7 litres, that’s up to 175 litres of overqualified water for flushing