SolarDew raises €800K seed to scale solar-powered drinking water tech
What's the deal? SolarDewDealroom has a profile for this one. Try Dealroom →, a Dutch startup that makes solar-powered water purification systems, has raised €800K from Connect the DropsDealroom has a profile for this one. Try Dealroom →, an early-stage water sector investor, and Oost NL, a regional development agency for the Dutch provinces of Gelderland and Overijssel. The company aims to bring clean drinking water to one million people by 2035.
SolarDew's technology uses evaporation and condensation through a membrane to purify polluted water or seawater. Because it runs entirely on solar thermal energy and gravity, it needs no electricity, chemicals, or high pressure — and requires very little maintenance. A station of roughly 32 units can produce about 100 litres of clean drinking water per day.
The funding will go toward scaling industrial production, which began earlier this year. The company manufactured 150 units last year and built a supply chain with European manufacturers.
Why now? Clean drinking water scarcity is worsening globally, especially in rural areas where 80% of the population lacks access to safe water. Water sources are growing more saline and polluted.
"By 2030, more than 100 million people will be in need of an alternative source for clean drinking water," said Alexander van der Kleij, SolarDew's chief executive officer. Existing desalination technologies are built for large-scale use, making them too complex and maintenance-heavy for smaller communities, schools, and clinics in remote or arid regions.
SolarDew has completed its first two projects — one in Chile with a local hydroponics entrepreneur, another in Greece with the Technical University of Crete — and plans to install its next commercial projects before the end of 2026. It also secured a Dutch patent, with European and international patents expected by year-end.
What could go wrong? At 100 litres per day from a 32-unit station, output remains modest. Scaling to serve one million people by 2035 will require massive production ramp-ups and significant additional capital. The company is already raising more funds through a crowdfunding campaign on Republic Europe — a sign that the €800K alone won't be enough.
Deploying hardware in remote, water-stressed regions also brings logistical and distribution challenges that software startups don't face.
The signal: SolarDew's early growth stage and repeat backing from Oost NL point to a startup gaining traction in a niche that larger desalination players tend to overlook — small, off-grid communities. Connect the Drops, classified as a corporate investor focused on the water sector, adds domain-specific credibility at a moment when climate adaptation funding is accelerating across Europe. If SolarDew can convert its first commercial installations in Chile and Greece into repeatable deployments, the company could establish an early-mover position in decentralised solar desalination before better-capitalised competitors turn their attention downstream.
Read more: Tech.eu
