Solar Water Heater Split Type with Flat Plate Solar Collectors / Heat Pipe Solar Collector
Split‑type pressurized solar water heater supports two optional collector solutions: flat‑plate solar collector or heat‑pipe evacuated tube solar collector. Collectors are installed outdoors on rooftop, balcony or exterior wall, while fully‑pressurized storage tank is placed indoors. It adopts closed‑loop forced circulation driven by solar workstation with antifreeze glycol heat‑transfer fluid. Indirect heat exchange via internal copper coil keeps domestic drinking‑water fully isolated from solar loop medium. Delivers stable mains‑pressure hot‑water output. Optional electric backup heating guarantees 24‑hour domestic hot‑water for family bathing, laundry and kitchen use. Users can select flat‑plate or heat‑pipe collector according to local climate and building aesthetic requirements.
Working Principle
- For Flat‑Plate Collector: Sunlight penetrates low‑iron tempered glass and hits selective absorber sheet, converting solar radiation into heat to warm antifreeze medium inside copper flow channels.
- For Heat‑Pipe Evacuated Tube Collector: Borosilicate vacuum tubes absorb solar energy; sealed copper heat‑pipe realizes phase‑change heat transfer. No domestic water flows inside glass tubes; broken single tube will not cause system leakage.
- Intelligent differential‑temperature controller activates circulation pump once temperature difference between collector and tank reaches preset value. Hot antifreeze fluid flows into indoor tank, transferring heat to tap‑water through internal thick‑wall copper coil. Cooled medium flows back to collectors for next heating cycle in sealed closed‑loop.
- Pressurized storage tank directly connects municipal tap‑water pipeline for stable shower pressure. Built‑in optional electric heating compensates heat under insufficient sunlight.
Important note: System requires AC power supply for circulation pump and controller. Magnesium anode rod is consumable and needs periodical replacement. Fill suitable antifreeze glycol for cold‑climate projects.
Core Technical Specifications
‑ Available Tank Capacity: 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, low overnight heat loss ‑ Working Pressure: 6‑8 bar full‑pressurized tank, fitted with pressure‑relief safety valve ‑ Collector Option 1‑Flat‑Plate: Selective absorber coating; low‑iron tempered glass; aluminum alloy frame ‑ Collector Option 2‑Heat‑Pipe Evacuated Tube: Borosilicate 3.3 vacuum glass tube with TU1 copper heat‑pipe, Φ58‑1800 mm ‑ Heat Exchanger: High‑efficiency thick‑wall internal copper coil ‑ Circulation Mode: Closed‑loop forced circulation, complete solar workstation (pump + differential‑temperature controller + expansion vessel) ‑ Heat‑transfer Medium: Antifreeze glycol fluid ‑ Auxiliary Heating: Optional 1500‑3000W built‑in electric heating element ‑ Outer Casing & Bracket: Color‑coated galvanized steel or stainless‑steel anti‑rust frame ‑ Typical Service Life: 14‑20 years with regular maintenance ‑ Certifications: CE, ISO9001, Solar Keymark available for export shipments
Application Scenarios
‑ 100‑150L: 2‑4‑person household domestic hot‑water ‑ 200‑300L: 4‑7‑person large family, multi‑bathroom villa ‑ Modern residential buildings, rooftop / balcony‑wall‑mount installation ‑ Cold‑climate regions (recommend heat‑pipe collector); warm sunny zones (recommend flat‑plate collector) ‑ Coastal salt‑spray, high‑hard‑water quality areas; new construction & old‑house hot‑water renovation
Collectors need minimum 4‑6 hours direct sunlight daily, avoid shading from trees or buildings.
| Feature | Flat‑Plate Split Collector | Heat‑Pipe Evacuated‑Tube Split Collector |
|---|---|---|
| Appearance | Sleek flat panel, building‑integrated look | Vacuum glass tube style |
| Cold‑weather Performance | Good, suitable for warm‑temperate zones | Excellent, perfect for cold winter regions |
| Tube / Panel Damage Risk | No glass‑burst risk | Single tube broken without medium leakage |
| Diffuse Sunlight Efficiency | Moderate | High under cloudy & weak‑sunlight conditions |
| Installation Scene | Balcony wall‑hanging, modern aesthetic priority | Rooftop installation, winter performance priority |
Key Buying Considerations
- Collector selection: Choose flat‑plate for building aesthetic and warm climate; select heat‑pipe evacuated‑tube for cold‑climate areas.
- Power requirement: Split system must have stable power for pump and controller.
- Tank material: SUS316L liner recommended for coastal salt‑spray and high‑hard‑water regions; confirm magnesium anode rod included.
- Quotation confirmation: Check whether solar workstation, expansion vessel, antifreeze liquid and installation accessories are included.
- Export compliance: Prepare corresponding certifications for target‑market customs clearance.
Installation & Routine Maintenance
Installation must be finished by certified professional technicians. Adjust collector tilt angle according to local latitude. Complete pressure‑leakage test before commissioning. Never activate electric heating before tank is fully filled with tap‑water.
‑ Every 3‑6‑month inspection: Check collector surface cleanness, pump, controller and pipe joints for leakage. ‑ Every 1‑2‑year professional service: Replace consumed magnesium anode rod; test antifreeze fluid concentration; inspect copper‑coil heat‑exchange performance.
FAQ
Q: Flat‑plate or heat‑pipe collector, which one shall I pick?
A: Flat‑plate features neat appearance for building integration, ideal for warm‑sunny areas. Heat‑pipe evacuated‑tube owns superior anti‑freeze and weak‑light performance, best choice for cold‑climate regions.
Q: Will heat‑pipe collector leak if one tube breaks?
A: No. Heat‑pipe is dry‑type inside vacuum tube, no antifreeze medium inside glass tube. One damaged tube will not cause system leakage, system can keep working.
Q: What happens when power fails?
A: Circulation pump stops, heat transfer suspends. Optional backup power supply can be configured on request.
Final Conclusion
Split‑type solar water heater with optional flat‑plate or heat‑pipe solar collector is flexible premium closed‑loop solar hot‑water solution. Separated layout puts collectors outdoor and pressurized stainless‑steel tank indoors, lowering rooftop load‑bearing requirement. Customers may choose flat‑plate collector for architectural beauty or heat‑pipe evacuated‑tube collector for outstanding cold‑climate adaptability. Closed‑loop antifreeze circulation plus internal copper‑coil indirect heat‑exchange ensures safe drinking‑water isolation. Optional electric heating realizes stable 24‑hour domestic hot‑water supply. Actual performance depends on correct collector selection, standard installation and regular maintenance.
