80L‑300L Non‑Pressurized Heat Pipe Vacuum Tube Solar Energy Hot Water Heater
80L‑300L non‑pressurized heat‑pipe vacuum tube solar water heater is an economical household solar hot‑water unit. It adopts heat‑pipe evacuated vacuum tube collectors with natural thermosyphon passive circulation, no circulation pump required. The non‑pressurized tank relies on gravity water outflow, suitable for gravity‑feed water supply systems. Heat‑pipe phase‑change heat transfer delivers good performance under weak‑sunlight and low‑temperature conditions. Single broken tube will not cause water leakage. Optional electric auxiliary heating provides backup hot‑water on cloudy‑rainy days for family bathing, laundry and kitchen hot‑water needs.
Working Principle
- Borosilicate 3.3 heat‑pipe vacuum tubes absorb solar radiation. Solar energy turns the working medium inside heat‑pipe into vapor by phase‑change effect, heat is transferred to the manifold and then to water tank.
- Hot‑cold water density difference creates natural thermosyphon circulation. Hot water rises and accumulates in upper part of non‑pressurized storage tank, cold water flows down to be continuously heated in collector loop.
- Non‑pressurized tank operates under gravity mode. Hot water flows out depending on height water head. It cannot be directly connected to high‑pressure municipal tap‑water, otherwise tank damage may occur.
- When solar irradiation is insufficient, optional built‑in electric heating element compensates heat to guarantee hot‑water supply.
Important note: This is non‑pressurized gravity‑type equipment, must work with gravity water supply. Pipeline anti‑freezing insulation is required in frost‑prone regions. Magnesium anode rod is consumable, periodic inspection and replacement is needed.
Core Technical Specifications
‑ Available Tank Capacity: 80L /100L /150L /200L /250L /300L ‑ Inner Tank Liner: SUS304‑2B / SUS316L food‑grade stainless steel; replaceable magnesium sacrificial anode rod ‑ Insulation: 45‑55 mm high‑density closed‑cell PU integral foaming, effectively reduce heat loss ‑ Working Pressure: Non‑pressurized gravity working condition ‑ Collector: Heat‑pipe borosilicate vacuum tube, Φ58‑1800 mm, phase‑change heat transfer ‑ Circulation Mode: Natural thermosyphon passive circulation, no pump needed ‑ Auxiliary Heating: Optional 1500‑3000W built‑in electric heating element ‑ Outer Casing & Bracket: Color‑coated galvanized steel or stainless‑steel anti‑rust mounting frame ‑ Typical Service Life: 12‑18 years under regular maintenance ‑ Certifications: CE, ISO9001 available for export shipments
Application Scenarios
‑ 80‑150L: 1‑4‑person household domestic hot‑water ‑ 200‑300L: 4‑7‑person large‑size family ‑ Rooftop installation, households with gravity water supply ‑ Areas with cold winter and weak‑sunlight weather; rural residence, residential renovation projects
Collectors need minimum 4‑6 hours direct sunlight daily. Keep away from shading of trees and surrounding buildings.
| Feature | Non‑Pressurized Heat‑Pipe Vacuum Tube Solar Heater | Non‑Pressurized Flat‑Plate Solar Heater | Split Pressurized Solar Water Heater |
|---|---|---|---|
| Collector Type | Heat‑pipe evacuated vacuum tube | Flat‑plate collector | Flat‑plate / heat‑pipe optional |
| Working Mode | Non‑pressurized gravity thermosyphon | Non‑pressurized gravity thermosyphon | High‑pressure closed‑loop forced circulation |
| Circulation | Passive, no pump | Passive, no pump | Pump‑driven circulation required |
| Water Supply | Gravity water supply only | Gravity water supply only | Directly connect municipal tap‑water |
| Low‑temperature Performance | Excellent | Good | Excellent with antifreeze glycol |
| Cost | Economical | Economical | Higher investment |
Key Buying Considerations
- Water supply condition: Non‑pressurized model depends on gravity water head, forbidden to directly connect mains high‑pressure tap‑water.
- Climate advantage: Heat‑pipe vacuum tube performs better in cold and weak‑sunlight areas.
- Tank material: SUS316L liner is recommended for coastal salt‑spray and high‑hard‑water‑quality regions.
- Quotation confirmation: Confirm electric heating, vacuum tube quantity and full set mounting accessories are included.
- Export compliance: Apply corresponding certifications for target‑market customs clearance.
Installation & Routine Maintenance
Installation shall be completed by professional technicians. Adjust collector tilt angle according to local latitude. Never turn on electric heating before tank is fully filled with water.
‑ Every 3‑6‑month inspection: Clean dust on vacuum tube surface; check pipelines and joints for leakage. ‑ Every 1‑2‑year professional service: Replace consumed magnesium anode rod; clean tank internal sediment.
FAQ
Q: What is the merit of heat‑pipe vacuum tube for non‑pressurized solar heater?
A: Heat‑pipe phase‑change heat transfer brings outstanding cold‑resistance and weak‑light performance. Single tube broken will not cause water leakage, system still keeps working.
Q: Can this non‑pressurized unit hook up city tap‑water directly?
A: No. It is gravity non‑pressurized structure. Direct connection to municipal high‑pressure water will damage tank body. Gravity water supply system is mandatory.
Q: How about winter performance?
A: Heat‑pipe vacuum tube adapts well to cold environment. Still need pipeline anti‑freezing insulation to prevent pipe freeze‑cracking.
Final Conclusion
80L‑300L Non‑Pressurized Heat Pipe Vacuum Tube Solar Energy Hot Water Heater is cost‑effective household solar hot‑water product. Heat‑pipe vacuum‑tube collector owns good low‑temperature and diffuse‑sunlight adaptability. Natural thermosyphon passive circulation without pump lowers failure rate. Non‑pressurized gravity‑mode tank fits gravity water‑supply households. Optional electric heating ensures hot‑water supply in bad weather. Note it cannot bear municipal tap‑water pressure. Actual service effect relies on correct water‑supply matching and regular maintenance.
