Solar Energy Evacuated Tube Water Heater for Family Bathing
Evacuated tube solar water heater is a mainstream household solar thermal solution specially designed for family bathing. It uses high‑efficiency borosilicate vacuum glass tubes to capture solar radiation and heat domestic water. Available in integrated thermosyphon type and split pressurized type to match different house structures. Non‑pressure and pressurized versions are optional. With thick‑layer polyurethane insulation, hot‑water retains temperature overnight. Optional electric backup heating ensures stable hot‑water supply for bathing, laundry and kitchen use even on cloudy‑rainy days. Suitable for multi‑member family daily bathing scenarios.
Working Principle
- Borosilicate evacuated glass tubes absorb sunlight; the inner selective absorbing coating converts solar energy into heat to warm water. Vacuum layer minimizes heat dissipation, delivering good heating performance in cool weather.
- Integrated thermosyphon model: Hot‑cold water density difference drives natural gravity circulation, hot water rises into overhead storage tank, no circulation pump required.
- Split pressurized model: Rooftop collectors work with indoor storage tank. Circulation pump drives antifreeze medium for closed‑loop heat exchange via internal copper coil, delivering mains‑pressure hot‑water.
- When sunlight is insufficient, optional built‑in electric heating element automatically makes up heat to guarantee family bathing hot‑water demand.
Core Technical Specifications
‑ Available Capacity: 100L /150L /180L /200L /250L /300L ‑ Inner Tank Liner: SUS304 / SUS316L food‑grade stainless steel; replaceable magnesium sacrificial anode rod for anti‑corrosion ‑ Insulation: 45‑55 mm high‑density closed‑cell polyurethane foam ‑ Solar Collector: Borosilicate 3.3 evacuated vacuum glass tube, Φ58‑1800 mm standard size ‑ System Option: Integrated thermosyphon (non‑pressure / pressurized); Split pressurized closed‑loop ‑ Working Pressure: Atmospheric non‑pressure / 6‑8 bar full‑pressurized optional ‑ Auxiliary Heating: Optional 1500‑3000W built‑in electric heating element ‑ Outer Casing: Color‑coated galvanized steel or stainless steel sheet ‑ Mounting Bracket: Galvanized steel / aluminum alloy anti‑rust frame ‑ Typical Service Life: 13‑19 years with regular maintenance ‑ Certifications: CE, ISO9001, SASO available for export
Application Scenarios
‑ 100‑150L: 2‑4‑person family daily bathing ‑ 180‑250L: 4‑6‑person family, multi‑bathroom household ‑ 300L: Large family, small villa residential use ‑ Rooftop household, rural housing, residential renovation projects
Collectors need minimum 4‑6 hours direct sunlight daily, avoid shading by trees or buildings. Outdoor pipelines need anti‑freezing insulation in frost‑prone areas.
| Feature | Integrated Thermosyphon Evacuated Tube Heater | Split Pressurized Evacuated Tube Heater | Flat‑Plate Solar Water Heater |
|---|---|---|---|
| Installation | Tank and tubes both on rooftop | Tubes on roof, tank indoors | Collectors on roof, tank rooftop / indoor |
| Circulation | Natural thermosyphon, no pump | Pump‑driven closed‑loop forced circulation | Thermosyphon / forced circulation |
| Pressure Option | Non‑pressure / pressurized | Full pressurized | Non‑pressure / pressurized |
| Freeze‑proof | Need pipeline anti‑freezing | Excellent with antifreeze glycol | Moderate‑good depends on structure |
| Rooftop Load | High (full water‑filled unit) | Low (only collectors) | High / low according to type |
Key Buying Considerations
- Capacity selection: Choose tank volume based on family member quantity and bathing habit.
- System type: Non‑pressure model needs overhead gravity water tank; pressurized or split type directly connects municipal tap‑water for comfortable shower pressure.
- Tank material: SUS316L liner is recommended for coastal and high‑hard‑water regions; confirm magnesium anode rod is supplied.
- Configuration check: Confirm whether electric heating, controller and installation accessories are included in quotation.
- Export: Prepare target‑market required certifications for customs clearance.
Installation & Routine Maintenance
Installed by qualified local technicians. Adjust tube tilt angle according to local latitude. Never switch on electric heating until tank is fully filled with water.
‑ Every 3‑6‑month inspection: Clean dust on vacuum tube surface; check brackets, pipe joints for leakage and rust. ‑ Every 1‑2‑year service: Replace consumed magnesium anode rod; flush tank sediment; test electric heating performance.
FAQ
Q: Can evacuated tube solar water heater supply hot‑water for family bathing in winter?
A: Evacuated tubes collect solar heat well on sunny winter days. For freezing‑prone zones, split closed‑loop model with antifreeze is recommended; integrated type needs strict pipeline anti‑freezing treatment.
Q: What capacity is suitable for family bathing?
A: 40‑60L hot‑water per‑person reference. 2‑4 persons choose 100‑150L; 4‑6 persons choose 180‑250L.
Q: Does it still work on rainy and cloudy days?
A: Solar heating efficiency drops without sunlight. Optional electric heating provides backup hot‑water for bathing.
Final Conclusion
Solar Energy Evacuated Tube Water Heater for Family Bathing is a mature household solar thermal product for domestic bathing demand. Evacuated vacuum tube owns reliable heat‑collecting performance under different ambient temperature. Multiple capacity and system‑type options fit diverse family sizes and house installation conditions. Optional electric heating realizes 24‑hour hot‑water supply for bathing. Actual performance depends on reasonable capacity selection, standard installation and regular maintenance.
