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What Makes Us Unique?

In Europe, the predominant solar thermal systems rely on solar thermal technology with heat pipes vacuum tubes.


Our primary offering, the unpressurized thermal solar system (thermosiphon - solar collector), features a non-pressurized tank combined with vacuum tubes without heat pipes, which are commonly employed in solar systems for generating hot water.


This solar system represents the simplest and most natural approach for directly heating water within the system. The vacuum tube without heat pipe has a double-walled glass structure, enclosing an evacuated air chamber.


The inner tube is coated with an absorber layer that captures sunlight and transforms it into heat. Typically, the absorber coating consists of multiple layers of metals or semiconductors applied at specific thicknesses to optimize sunlight absorption and reflection.

Comparison between an Open Solar System with integrated tank and a Closed Pressurized Solar System:



  • Open Solar System with integrated tank: In this system, heat transfer occurs through natural convection. Sunlight heats the water within the solar collector, which then flows up to an integrated tank. The heated water can be directly utilized. This system operates without pressure, eliminating the need for pumps or additional controls.

  • Closed Pressurized Solar System: In a closed pressurized system, a heat transfer medium (such as water-glycol mixture or special thermal oil) is pumped through the solar collector. The sun's heat transfers to this medium, which is then directed to an external heat storage tank or heat exchanger. The system is pressurized, and a pump ensures continuous flow of the medium.



  • Open Solar System with integrated tank: Efficiency in this system is influenced by factors like collector size, inclination angle, solar radiation, and the heat transfer medium. Open systems can offer good efficiency due to direct heat transfer and natural convection.

  • Closed Pressurized Solar System: Closed pressurized systems tend to be efficient because they enable precise control of heat transfer. The use of pumps allows the heat transfer medium to circulate efficiently, facilitating effective heat transfer but at a higher cost.


Maintenance & Security

  • Open Solar System with integrated tank: Open systems typically require less maintenance since they have fewer moving parts and components, resulting in a reduced risk of leaks or pressure-related issues.

  • Closed Pressurized Solar System: Closed pressurized systems demand regular checks of pressure, pumps, and the heat transfer medium. There is a small risk of leakage or pressure loss. Commissioning and maintenance may require specialized knowledge and expertise.


Areas Of Application

  • Open Solar System with integrated tank: This type of system is often employed for water heating in residential buildings or summer houses. They are also suitable for smaller applications and locations where external heat storage tanks are inaccessible.

  • Closed Pressurized Solar System: Closed systems are more versatile and can be used for various applications, including space heating, process heat, and integration into larger energy systems.


What Now?

The choice between an Open System with an integrated tank and a Closed Pressurized System depends on specific requirements, budget, and preferences. Seeking the advice of a professional is recommended to determine the most appropriate system for individual needs.

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