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Pump-free Natural Circulation Solar Domestic Hot Water Systems
We are dedicated to the design, research and development, and installation of Eco-friendly clean energy hot water systems. This pump-free water heater is a high-efficiency solution with CE, ISO9001, and CCC certificates, suitable for residential and commercial use in hospitals, hotels, and schools.
Utilizing open water tank heat storage and a closed coil for heat exchange, this system features 20-second rapid heat exchange technology. Hot water is available quickly with municipal-level pressure, ensuring a consistent temperature without sudden fluctuations.
Uses RHEs reverse heat exchange technology. Pressurized water is fresh and free from secondary pollution without needing a booster pump.
Cold water turns into hot water in just 20 seconds. Maintains fresh water quality suitable for kitchen use.
Super blue titanium coating ensures high absorption and low reflection for maximum energy efficiency.
Expandable water tank design allows for scaling up based on hot water demand.
| Component | Specification |
|---|---|
| Collector Type | Antifreeze Flat Plate (Blue Film) |
| Number of Collectors | 2 Pieces (1000*2000*80mm) |
| Inner Tank | 0.5mm SUS304 Stainless Steel (Φ380mm) |
| Outer Tank | 0.4mm Color Galvanized Steel (Φ480mm) |
| Insulation | 50mm Polyurethane Foam |
| Heat Exchanger | 304 Stainless Steel (0.3mm thickness) |
| Water Tank Capacity | 240L |
| Total Aperture Area | 4.0 m² |
| Net Weight | 132 kg |
| Operating Temp | 0ºC to -20ºC (Antifreeze version) |
96 sets of pump-free collectors covering 403.2 m². Storage capacity: 120,900 liters of 60ºC hot water.
Installation for 800 students. Storage capacity: 32,000 liters. Daily energy saving: 476,575 kWh.
600 sets of collectors covering 2,520 m² for 1,200 people. Capacity: 45,000 liters.
Projects in Cote d'Ivoire for 1000 students. 101 sets installed providing 24,240 liters of hot water.







Coden Kitchen