Rainmaker

Company profile

Founded in the Netherlands in 2015, Rainmaker is dedicated to solving one of the world’s most urgent issues: water scarcity. With 2.2 billion people lacking access to clean water, Rainmaker provides a sustainable, decentralized solution through its patented Air-to-Water and Water-to-Water systems. These systems transform air and non-potable water into safe drinking water, offering an economical, scalable, and eco-friendly resource where it’s most needed.

Rainmaker’s product portfolio includes high-capacity Air-to-Water systems that generate up to 5,000 liters of water per day from atmospheric humidity and Water-to-Water systems that desalinate or purify local water sources. Additionally, Rainmaker supports water distribution with water kiosks and semi-automatic bottling solutions, powered sustainably through solar and wind energy options. This makes Rainmaker’s technology ideal for remote, off-grid regions that face the highest levels of water scarcity.

Rainmaker operates primarily in regions around the equator, where water infrastructure is often limited. Backed by a team with deep expertise in renewable technology, the company has achieved rapid growth and is poised to reach €10 million in annual revenue by 2026. With an expanding portfolio and an established reputation, Rainmaker is a frontrunner in sustainable water technology, bringing clean water to those who need it most.

Developments since the last funding round with Invesdor

You know this company already because of the last funding round? Find out more about what has happened since then.

Company Info 

Products and services

Rainmaker offers a portfolio of innovative water production and distribution solutions designed for regions experiencing water scarcity. The company’s core offerings include:

1. Air-to-water (AW) systems: These units extract humidity from the air and condense it into potable water. The AW-5000 model produces up to 5,000 liters daily, utilizing solar or wind energy. Ideal for humid climates, AW:s provide a reliable water source without infrastructure requirements, making them an effective, standalone solution for remote areas​
2. Water-to-water (WW) systems: Rainmaker’s WW technology converts saline or non-potable water into drinking water, producing up to 30,000 liters per day. With a highly efficient thermal process, the WW systems are environmentally sustainable, producing minimal brine waste and using renewable energy to operate, making them perfect for small to medium-scale applications​.
3. Bottled water: Rainmaker’s approach makes water ready accessible to residents through bottled water or dispensers. They have integrated a bottling system and plant into their technology modules, ensuring convenient access to high-quality drinking water (filling between 1,000 – 4,000 blow molded bottles per hour).
4. Water kiosks/ATMs: Rainmaker’s water kiosk solution integrates technology modules to transform local tap water provision into a profitable business.
5. Water recycling: Rainmaker efficiently uses heat to recycle wastewater into drinking water. This groundbreaking approach minimizes water consumption and reduces environmental impact.
6. Innovative cooling: Rainmaker helps data centers achieve cooling using sustainable water resources. It enables customers to make their processes water-neutral or even produce drinking water.
7. Emergency relief solution: The flexibility and robustness of the Rainmaker unit make it excel in humanitarian aid and emergency relief, providing fresh water.
8. Removing PFAS and other contaminants from water: Using the Rainmaker Water-to-Water installation allows for the purification of the most polluted form of water to potable water. This enables freshwater production inlets, without traces of chemicals including PFAS, thus producing a higher standard of drinking water.

Rainmaker’s newest addition – 250-litre units

250-litre air-to-water machines: Rainmaker’s latest addition meets demand for smaller and more affordable units. Each machine produces up to 250 liters of clean water per day. They can be sold as a simple air-to-water system, combined with solar PV and battery storage, or with a dispenser and payment option. The model is designed for wider use, with potential clients including parishes in Nigeria, households in Spain, and communities in Turkey and Greece. Marinas in Southern Europe and aid projects in Ukraine and Syria have also shown strong interest.

Market

Rainmaker operates in the sustainable water technology market, focusing on areas where water scarcity and limited or no infrastructure present significant challenges. With rising global demand for safe and affordable water, particularly in underserved regions, the market for innovative solutions like Rainmaker’s Air-to-Water and Water-to-Water systems is expanding rapidly. This growth is driven by increasing awareness of environmental issues, health concerns, and climate-related disruptions affecting traditional water sources.

Competitors in this market offer a range of water production solutions, including alternative atmospheric water generators and desalination technologies. However, these systems often rely on higher energy inputs or centralized infrastructure, limiting their feasibility for remote or off-grid areas. Unlike these alternatives,  Rainmaker can operate in areas with no or limited infrastructure. Rainmaker’s solutions are powered by renewable energy sources such as solar and wind, providing clean water directly at the source with minimal environmental impact.

As global demand for clean water continues to grow, Rainmaker is positioned to capture a significant share of this high-demand market by offering a sustainable and accessible solution for communities facing severe water challenges.

Management

Distribution of company shares

The company’s shareholder structure reflects a strong balance between entrepreneurial drive, professional capital management, public support, and long-term private commitment. This mix of shareholders ensures both stability and growth orientation:

• 29.6% Private investors: A broad group of committed private investors provides long-term financial backing and demonstrates market confidence in the company’s strategy.
• 26.6% Oosterling Family (founders): With a significant stake, the founding family remains deeply invested in the success of the company. Their entrepreneurial vision and long-term commitment align directly with the interests of new investors.
• 24.4% ICOS – Capital Management: A professional capital management firm adds financial expertise and strategic guidance, strengthening governance and growth planning.
• 9.7% City of Rotterdam / SOFIE Fund: This public investment emphasizes institutional trust and highlights the company’s relevance for local economic and sustainability goals.
• 9.7% (Former) management and employees: Shareholding by current and former team members underscores the culture of ownership and accountability, ensuring that those who have built the company remain connected to its long-term value creation.

Overall advantage for investors:
This diversified shareholder base combines entrepreneurial continuity, financial discipline, public endorsement, and private trust. The alignment of founders, professional investors, and local institutions ensures both stability and ambition, creating a solid foundation for growth and safeguarding the interests of all shareholders, including new investors.

Company structure

Rainmaker operates through a transparent and efficient group structure designed to balance commercial growth with social impact.

• Rainmaker Holding B.V.: The parent entity in which investors participate. It owns 100% of the group’s subsidiaries and oversees overall financial management.
• Rainmaker Holland B.V.: Responsible for product development, R&D, quality control, and certification to ensure innovation and compliance with international standards.
• Rainmaker International B.V.: Acts as the EPC (Engineering, Procurement & Construction) provider for global projects, delivering turnkey water solutions to clients worldwide.
• Rainmaker Stichting (Foundation): Rainmaker’s foundation receives 10% of the Holding’s revenues and supports projects with limited financial returns that are not attractive for commercial players. It enables funding from investors, NGOs, and charitable organizations to bring clean water to underserved communities, offering tax benefits to its financiers. The foundation finances the projects, while Rainmaker provides the equipment and expertise to realize them.

Investors in this financing round acquire a stake in Rainmaker Holding B.V., the parent company. This ensures that revenues and profits from all subsidiaries flow into the holding entity, aligning investor returns with the entire group’s performance.

Developments at Rainmaker since the last funding round

Since the last financing round, Rainmaker has made significant progress:

• Strengthened capital structure
  Shareholder loans were converted into equity, giving Rainmaker an equity position of approx. €7 million by the end of 2025 (around 70% solvency).

• New product development
  In collaboration with TU Delft, Rainmaker developed a 250-litre Air-to-Water machine for households, smaller communities, and marinas. A second product line for ultra-pure water has also been introduced, targeting hydrogen production and PFAS removal.

• Strong sales pipeline
  In H1 2025, Rainmaker achieved €1.7 million turnover. Projects in Somalia (€2.1 million), Bali (€1.6 million), and Nigeria (€0.3 million) are in approval stages, with additional discussions ongoing in Guinea-Bissau, Senegal, Cape Verde, Tanzania, and Morocco.

• Partnerships and subsidies
  A collaboration with the Dutch Government is underway for mobile water purification units (also of interest in Switzerland and Sweden). Rainmaker also benefits from WBSO subsidies, reducing development costs by 30%.

• Improved margins
  Supply chain optimisation reduced production costs by approx. 25%. The new generation of machines achieves a gross margin of around 50%.

• Sales & distribution
  Investments in HubSpot CRM, a lead database, and collaboration with professional sales agents and export partners ensure a steady inflow of leads and better sales execution.

Back to the beginning

Use of funds

Rainmaker seeks €1,500,000 in funding to scale its operations, enter new markets, and advance its technology. The raised funds will be allocated strategically as follows:

• 60% – Product development: the development and production of the small scale water generator and an ultra-pure water machine.
• 40% – General working capital: to support growth. 

Actual and planned figures

Get an insight into Rainmaker's financial figures, such as turnover and earnings development. Learn more about the growth forecast.

Investment related documents

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