150 180 250 360 Litre Termas Solares Thermosyphon Pressure Solar Water Heater with Copper Coil
Termas Solares thermosyphon pressure solar water heater with internal copper coil is an integrated passive rooftop solar hot‑water unit, widely popular in Latin‑American markets. Available capacities: 150L, 180L, 250L, 360L. It adopts natural gravity thermosyphon circulation without circulation pump. The built‑in high‑efficiency copper heat‑exchange coil realizes indirect heat transfer, fully isolating heat‑transfer fluid from domestic drinking water. Working under municipal water pressure, it delivers stable high‑pressure hot‑water for households, villas and small homestays. Optional auxiliary electric heating guarantees 24‑hour hot‑water supply under cloudy, rainy and cold weather conditions.
Working Principle
- Solar collectors (flat‑plate or evacuated tube) absorb solar radiation and convert sunlight into thermal energy, heating the antifreeze heat‑transfer medium inside the collector loop.
- Driven by density difference, hot medium flows through the internal copper coil inside the pressurized storage tank. Heat transfers from the circulating fluid to the domestic tap‑water via copper coil indirect heat exchange. Drinking water never mixes with antifreeze medium.
- Cooled heat‑transfer medium flows back to solar collectors, forming continuous thermosyphon circulation, no electric pump required.
- Storage tank operates under mains water pressure, end‑users obtain steady shower water pressure without extra booster pump.
- When solar energy is insufficient, optional built‑in electric heating element starts automatically to compensate heat, ensuring round‑the‑clock hot‑water output.
Core Technical Specifications
‑ Available Capacities: 150L / 180L / 250L / 360L ‑ Inner Tank Liner: SUS304 / SUS316L food‑grade stainless steel or enamel liner; replaceable magnesium sacrificial anode rod for anti‑corrosion protection ‑ Heat‑exchange Component: High‑conductivity internal copper coil for indirect heat transfer ‑ Insulation: 45‑55 mm high‑density closed‑cell polyurethane foam, minimize standby heat loss ‑ Working Pressure: 6‑8 bar standard pressurized design ‑ Collectors: Evacuated vacuum‑tube or flat‑plate solar collectors for option ‑ Auxiliary Heating: Optional 2000‑3000W built‑in electric heating element ‑ Safety Fittings: Temperature‑pressure relief valve, over‑temperature cut‑off, dry‑heating prevention, leakage protection ‑ Typical Service Life: 14‑19 years with regular maintenance ‑ Certifications: CE, ISO9001 available for Latin‑America export projects
Application Scenarios
‑ 150‑180L: 3‑5‑person family residential rooftop ‑ 250L: 5‑7‑person large‑family, multi‑bathroom villa ‑ 360L: Big household, small homestay, mini guesthouse
Collectors require minimum 4‑6 hours direct sunlight per day, avoid shading from trees and buildings. For frost‑prone regions, external pipeline anti‑freezing insulation is mandatory.
| Feature | Thermosyphon Pressure Solar Heater with Copper Coil | Ordinary Direct‑flow Thermosyphon Solar Heater | Split Pressurized Solar System |
|---|---|---|---|
| Heat‑exchange Mode | Indirect heat transfer via internal copper coil | Direct water heating inside collector | Indirect copper‑coil forced circulation |
| Medium Isolation | Drinking‑water separated from antifreeze fluid | Water circulates directly inside collectors | Drinking‑water separated from antifreeze fluid |
| Circulation Mode | Natural thermosyphon, no pump | Natural thermosyphon, no pump | Pump‑driven closed‑loop circulation |
| Tank Location | Rooftop above collectors | Rooftop above collectors | Indoor / equipment room |
| Water Pressure | Mains‑level pressurized | Pressurized / non‑pressurized optional | Mains‑level pressurized |
| Freeze Protection | Need pipeline anti‑freezing treatment | High risk of frost damage in cold weather | Excellent freeze‑proof with glycol fluid |
| Target Market | Latin‑America (Termas Solares market) | Global budget‑oriented household market | Global villa & commercial projects |
Key Buying Considerations
- Rooftop load‑bearing: Full water‑filled unit is heavy, check rooftop structural load‑bearing capacity before ordering.
- Tank material: SUS316L liner is recommended for coastal areas with salt spray and high‑hardness local water quality. Confirm magnesium anode rod is included.
- Copper coil quality: Thick‑wall high‑conductivity copper coil ensures long‑term anti‑corrosion and high heat‑exchange efficiency.
- Auxiliary heating: Confirm whether electric heating element and controller are included within quotation.
- Export compliance: Prepare corresponding certifications for Latin‑America customs clearance.
Installation & Routine Maintenance
Installation must be completed by certified local installers. Adjust collector tilt angle according to local latitude. Never activate auxiliary heating until tank is fully filled with tap‑water.
‑ Every 3‑6‑month inspection: Clean dust on collector surface; check brackets for rust and loose fasteners; inspect pipe joints for leakage. ‑ Every 1‑2‑year professional service: Replace consumed magnesium anode rod; flush tank sediment for hard‑water areas; inspect copper coil working status and test electric heating performance.
FAQ
Q: What is the benefit of internal copper coil for termas solares?
A: Copper coil realizes indirect heat exchange. Domestic drinking water is completely separated from antifreeze medium, avoiding water pollution and slowing inner‑tank corrosion.
Q: Can this thermosyphon pressure solar heater work in cold winter?
A: It works on sunny winter days. Outdoor pipelines must be wrapped with anti‑freezing insulation. For long‑term freezing‑temperature zones, extra anti‑freezing measures shall be applied on site.
Q: Why is this model popular in Latin‑American market?
A: Pressurized output brings comfortable shower experience; copper‑coil indirect structure improves service life under complex local water quality; thermosyphon pump‑free design lowers failure rate and after‑sales cost.
Final Conclusion
150‑360 Litre Termas Solares thermosyphon pressure solar water heater with copper coil is a mature passive solar hot‑water solution specially fit for Latin‑American market. With pump‑free thermosyphon circulation, internal copper‑coil indirect heat exchange and full‑mains‑pressure hot‑water output, it serves residential and small‑light‑commercial rooftop hot‑water demands. Optional auxiliary heating achieves stable 24‑hour hot‑water supply. Actual performance relies on proper site selection, standard installation and periodic maintenance.
