HeatVentors Raises PLN 17 Million in Series A Round to Accelerate Global Expansion of Intelligent Thermal Batteries
HeatVentors Kft., a portfolio company of InnoEnergy and a pioneer in thermal energy storage, has successfully closed a Series A funding round worth PLN 17 million (€4 million).
The raised capital will be allocated to international expansion and scaling of its breakthrough technology. The investment will strengthen the company’s technical infrastructure, accelerate product development for multi-megawatt energy storage applications, and enable entry into new strategic sectors such as data centers, district heating networks, and large-scale cooling systems – with a special focus on the Middle East, where demand for cooling is exceptionally high.
Poland is one of the leaders in the data center sector – its installed capacity is forecast to triple to 500 MW by the end of 2030, with a parallel increase in cooling demand.
HeatVentors develops and manufactures patented Intelligent Thermal Batteries, which, combined with advanced control technology, deliver up to 25% energy savings in both cooling and heating systems. These versatile solutions allow energy storage from renewable sources, waste heat recovery, and reliable HVAC system operation. The company’s technology is already deployed in seven countries, including Germany, Portugal, Hungary, and Oman, with nearly 80 storage units installed. HeatVentors’ solutions have been adopted by 4- and 5-star hotels, leading industrial manufacturers, modern office buildings, major international insurers, and key players in the global energy sector.
Currently, the company offers batteries with capacities of 30 kWh and 60 kWh, while a larger unit of up to 1.2 MWh is under development. A portion of the newly raised PLN 17 million will be dedicated specifically to finalizing this larger storage solution.
“Energy storage has been recognized in virtually all major markets as a crucial enabler of decarbonization. This new investment not only supports the global expansion of our Intelligent Thermal Batteries but also strengthens our technological capabilities for international scaling, fueling our global growth,” said József Kakas, CEO of HeatVentors Kft.
The latest Series A round was led by an international consortium of renowned investors, marking a significant milestone in the company’s expansion strategy. The group includes InnoEnergy, Blue Planet Venture Capital Fund, and Impulsus Clean Technologies GmbH, with advisory support from V3 Partners Zrt.
Breakthrough Technology – How HeatVentors Works“HeatVentors’ revolutionary solution is not just the technology of the future, but also of the present: it saves energy and reduces costs. The company is pioneering the creation of a new, $5 billion market for Intelligent Thermal Batteries, and as one of the investors, we will support its scaling,” commented Mikołaj Budzanowski, InnoEnergy’s Managing Director for Central Europe.
Thermal batteries are advanced energy storage systems based on Phase Change Materials (PCM), which absorb and store energy during phase transitions (e.g., from solid to liquid) and release it when reverting to the original state. This enables efficient storage of heat with high energy density in relatively compact units.
HeatVentors leverages PCM technology to store excess heat during periods of low demand or lower tariffs and release it when needed most. As a result, large facilities can intelligently manage thermal energy, reducing costs and improving energy efficiency.
A unique feature of HeatVentors’ solution is its proprietary Control System, which enables autonomous, real-time management of the thermal battery. The intelligent system monitors the energy conditions of a building as well as variable tariffs, automatically adjusting operation to maximize savings and optimize energy use – without the need for manual intervention.
About the Investors- InnoEnergy drives the industrialization of clean-tech innovations, enabling the creation of a global net-zero economy. Operating across Europe and the U.S., it invests in early-stage start-ups as well as current and future human capital, building resilient clean-tech value chains to support sustainable economic growth. Its ecosystem of 1,400 partners and 39 shareholders from industry, finance, public policy, and academia accelerates the energy transition. InnoEnergy currently supports more than 160 clean-tech start-ups and scale-ups, including four industrial unicorns, which together have raised over €30 billion, created 40,000 jobs, and are expected to generate €110 billion in revenue and reduce CO2 emissions by 2.1 gigatons by 2030.
- Blue Planet Venture Capital Fund invests in innovative, technology-driven companies that support Hungary’s environmental and climate goals. It focuses on sustainable development, emissions reduction, renewable energy, energy storage, and the circular economy.
- Impulsus Clean Technologies GmbH is a German corporate investor and accelerator for innovative start-ups in wind energy, e-mobility, and recycling, supporting sustainable industrial ventures. One of its key shareholders is Professor Kohl from Germany.
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