Ultra Thin Solar Flat Plate Collector

The Ultra-Thin Flat Plate Solar Collector from Soletks Solar is a breakthrough in the field of solar thermal collectors, offering exceptional thermal performance in a sleek, modern form. With a total thickness of just 50 mm, it is designed to blend seamlessly with building architecture while delivering powerful heating capacity for both residential solar water heating systems and commercial solar hot water projects.

Unlike traditional models, which are bulky and heavy, this ultra-thin solar collector combines superior insulation, high solar absorptance, and a minimalistic profile to achieve zero-carbon hot water and heating. It is ideal for homes, villas, hotels, schools, hospitals, and any building where aesthetics and efficiency are equally important.

Advanced Technical Features

1. Slim but Strong Structure
With a reduced thickness of 50 mm, the collector is 38% thinner than standard 80 mm panels. This design not only improves the architectural appearance but also reduces freight volume significantly. A 40HQ shipping container can carry up to 400 units of this model compared to only 270 units of traditional collectors, leading to a 48% saving in transportation costs.

The frame is made from aerospace-grade aluminum alloy with a 0.8 mm steel backing plate, offering an impressive load resistance of 240 kg/m². The design features R3 rounded corners for safety and a clean, modern look.

2. High-Density Polyurethane Insulation
At the core of its performance is a one-piece, high-pressure polyurethane foam layer with a density of 35 kg/m³. With a thermal conductivity (λ) of only 0.023 W/(m·K) and a closed-cell rate of 97%, it outperforms rock wool and polyester insulation used in conventional solar water heating panels. The insulation maintains its integrity even after 2,000 hot-cold cycles between –30°C and 120°C, ensuring stable thermal performance for decades.

3. Proprietary Blue-Selective Coating
The absorber plate features our in-house developed selective coating (blue film) with proven solar absorptance of 95% ± 2% and thermal emittance of just 4% ± 2% under AM1.5 conditions. The coating is highly weather-resistant, having passed 144-hour salt spray tests with no peeling, making it ideal for coastal or desert climates in regions such as the Middle East, Africa, and Southeast Asia.

4. Bonding Heat Transfer Technology
Using precision bonding, the copper tubes are joined seamlessly to the aluminum absorber plate, achieving 360° heat transfer. This increases the effective conduction area and boosts overall heat exchange efficiency by up to 15% compared to standard designs.

Performance Advantages Over Traditional Collectors

In practical terms, this means that for projects in Europe, the Middle East, or Africa, where shipping costs can be a significant portion of total expenses, the ultra-thin solar thermal panel offers a competitive advantage.

Applications

· Residential Solar Hot Water Systems: For daily domestic use, providing consistent hot water supply even in cold climates.

· Commercial Solar Water Heating Projects: For hotels, resorts, and industrial facilities requiring large volumes of hot water.

· Institutional Heating Solutions: For schools, hospitals, and community buildings seeking reliable, low-maintenance heating.

· Solar Heating for Villas and Luxury Homes: Enhancing both the property’s energy efficiency and aesthetic value.

Technical Specifications：

Why Choose Soletks Solar：

· Global Reach: Exported to 68 countries with over 1.2 GW installed capacity.

· Strong Warranty: 10 years for core components + 25 years linear performance guarantee.

· Expert Support: 24/7 technical service hotline with multilingual assistance.

· Customization: Optional RAL color customization to match building façades with a ΔE color difference of less than 1.5.

Real-World Q&A

Q: Will such a thin collector lose heat too quickly in winter?
A: No. The high-density polyurethane insulation ensures heat loss coefficient ≤ 0.35 W/(m²·K), outperforming thicker traditional models. Even in –10°C, the system can deliver 45°C hot water.

Q: How much can I save on transportation?
A: For every 1,000 units, you can save up to 48% in freight costs due to the higher container load capacity.

Q: Can I choose a custom frame color?
A: Yes. In addition to the standard matte black, you can select any RAL color for perfect architectural integration.