Soletks Solar is one of the world's few manufacturers capable of independently producing both blue and black selective absorber coatings, the heart of every high-performance solar collector. This vertical integration ensures superior quality control and optimized optical performance from the very beginning of production.

The EFPC Series employs a selective coating designed to maximize solar absorption while minimizing thermal radiation loss. Laboratory tests conducted by national-level research institutions confirm a thermal efficiency of 0.813, marking it as one of the most efficient flat plate collectors in the market.

This means stronger performance, even under cloudy skies or low-irradiance environments common in many regions.

Using Finite Element Method (FEM) analysis, Soletks engineers optimized the internal flow channels of the EFPC collector to achieve balanced heat distribution and enhanced energy transfer. This precision design ensures that every part of the collector performs at peak efficiency, avoiding the uneven heating issues often seen in traditional flat plate systems.

Even under extreme temperature differences, the EFPC delivers steady, powerful thermal output. This advanced design approach has been recognized with provincial-level innovation awards, highlighting its contribution to modern solar thermal engineering.

A key highlight of the EFPC design is its "insulation chamber" — a dedicated thermal barrier layer that dramatically reduces heat loss in both operating and standby states. With a heat loss coefficient as low as 2.2, it surpasses typical industry standards and ensures consistent efficiency even in fluctuating weather conditions.

Thanks to this innovation, the EFPC performs exceptionally well in climates with wide day-night temperature variations, maintaining stable operation and efficiency for many years with minimal degradation.