Pre‑Heated Pressure Integrative Solar Water Warmer with Copper Coil
Pre‑heated pressure integrative solar water warmer with internal copper‑coil heat exchanger is all‑in‑one rooftop thermosyphon solar hot‑water unit. The storage tank and evacuated tube collectors are assembled as one compact unit. The tank water is heated by solar energy and serves as heat‑storage medium. Mains cold tap‑water flows through high‑efficiency built‑in copper coil for pre‑heating heat exchange. It supports direct municipal tap‑water connection and delivers stable pressurized hot‑water output. Potable tap‑water is fully isolated from tank water, avoiding secondary contamination. Optional electric auxiliary heating guarantees continuous domestic hot‑water supply for household bathing, laundry and kitchen usage.
Working Principle
- Evacuated vacuum tubes capture solar radiation and convert sunlight into heat, warming the water stored inside the integrated tank by natural thermosyphon passive circulation, no circulation pump required.
- The tank‑stored hot‑water acts as thermal buffer. Cold tap‑water under mains pressure flows through the high‑purity copper coil submerged in hot tank water. Heat transfers rapidly from tank water to drinking water inside copper coil to realize pre‑heating effect.
- Tap‑water inside copper coil is completely separated from tank water. Users draw fresh pressurized hot‑water directly out of copper coil outlet. Tank water only works as heat‑transfer medium and does not enter domestic water pipeline.
- In cloudy‑rainy or low‑sunlight conditions, optional built‑in electric heating element heats tank water to maintain heat‑source temperature for copper‑coil pre‑heating, securing 24‑hour hot‑water supply.
Important note: Install on load‑bearing rooftop. Auxiliary feed tank is required to refill water for the non‑pressurized storage tank. Pipeline anti‑freeze insulation shall be applied in cold frost‑prone regions. Copper coil bears full mains tap‑water pressure; safety pressure relief valve must remain functional. Magnesium sacrificial anode rod is consumable and needs periodic inspection and replacement.
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, minimize standby heat loss ‑ Copper Coil Heat Exchanger: High‑purity red copper coil, 6‑8 bar pressure resistance, customized coil length ‑ Tank Working Mode: Non‑pressurized thermal storage tank; copper‑coil circuit for potable water is pressurized for mains tap‑water ‑ Solar Collector: Φ58×1800mm borosilicate evacuated vacuum tube, high‑efficiency selective absorbing coating ‑ Circulation Mode: Passive natural thermosyphon circulation, no pump, no external power for solar heating ‑ Auxiliary Heating: Optional 1500‑3000W built‑in electric heating element ‑ Outer Casing & Bracket: Color‑coated galvanized / stainless‑steel heavy‑duty anti‑rust rooftop mounting bracket ‑ Auxiliary Component: Matching small feed tank for automatic tank water refilling ‑ Typical Service Life: 12‑18 years under standardized routine maintenance ‑ Certifications: CE, ISO9001 available for export shipments
Application Scenarios
‑ 100‑150L: 2‑4‑person small‑medium family domestic hot‑water ‑ 200‑300L: 4‑7‑person large‑size household hot‑water demand ‑ Flat & sloped rooftop installation, rural houses, residential energy‑saving renovation projects ‑ Households expecting stable mains‑level shower pressure, require fresh non‑contaminated hot‑water ‑ Inland and coastal residential projects
Collectors need minimum 4‑6 hours effective direct sunlight daily. Avoid shading by trees and surrounding buildings. Confirm rooftop load‑bearing capacity before installation.
| Feature | Pre‑Heated Pressure Integrative Solar Water Warmer with Copper Coil | Ordinary Non‑Pressurized Passive Solar Heater | Integrated True‑Pressurized Solar Water Heater |
|---|---|---|---|
| Potable Water Path | Flows inside pressurized copper‑coil only, isolated from tank water | Tank water directly for usage | Whole tank bears mains pressure |
| Tank Condition | Storage tank non‑pressurized; copper‑coil loop pressurized | Whole tank non‑pressurized gravity type | Full tank 6‑8 bar pressurized |
| Water Outlet Pressure | Stable municipal tap‑water pressure | Gravity water‑head outflow | Stable municipal tap‑water pressure |
| Circulation | Passive thermosyphon, no pump | Passive thermosyphon, no pump | Passive thermosyphon, no pump |
| Fresh‑Water Performance | Always fresh tap‑water via copper‑coil heat exchange | Water stored long‑time inside tank | Water stored long‑time inside tank |
| Cost Level | Economical pressurized‑effect solution | Lowest cost | Higher investment |
Key Buying Considerations
- Rooftop load‑bearing: Verify roof load‑bearing capacity before full‑unit rooftop installation.
- Feed‑tank requirement: This model needs auxiliary small feed tank to refill the non‑pressurized storage tank.
- Pressure safety: Copper‑coil circuit bears mains pressure; keep pressure‑relief safety valve unblocked.
- Climate adaption: Apply pipeline anti‑freezing insulation for cold frost‑prone zones; SUS316L liner recommended for coastal salt‑spray & hard‑water‑quality locations.
- Quotation confirmation: Confirm full set including tank with internal copper coil, vacuum tubes, feed tank, bracket, sealing fittings and optional electric heating.
- OEM support: Custom tank capacity, copper‑coil length and brand logo for bulk export orders.
- Export compliance: CE & ISO9001 certification documents available for overseas customs clearance.
Installation & Routine Maintenance
Installation must be completed by professional certified solar installers. Adjust collector tilt angle according to local latitude. Never activate electric heating unless storage tank is fully filled with water.
‑ Every 3‑6‑month inspection: Clean dust on vacuum tube surface; check pipe joints, copper‑coil circuit and safety valve for leakage. ‑ Every 1‑2‑year professional service: Replace exhausted magnesium anode rod; inspect copper‑coil anti‑corrosion condition; check bracket anti‑rust performance.
FAQ
Q: Why is it called pre‑heated pressure solar water heater with copper coil?
A: The storage tank absorbs solar energy and stores heat. Cold tap‑water under mains pressure flows through copper coil inside hot tank and gets pre‑heated instantly. Potable water never mixes with tank water, delivering stable‑pressure fresh hot‑water output.
Q: Is the whole water tank pressurized?
A: No. The main storage tank is non‑pressurized and needs feed‑tank water refilling. Only the internal copper‑coil pipeline bears municipal tap‑water pressure, which is the core feature of this pre‑heated type.
Q: What are its main advantages?
A: Realizes mains‑pressure hot‑water experience at lower cost than full‑tank pressurized solar heater; drinking‑water is isolated from tank water for better hygiene; passive thermosyphon without pump, simple‑structured and low‑failure‑rate.
Final Conclusion
Pre‑Heated Pressure Integrative Solar Water Warmer with Copper Coil is cost‑effective all‑in‑one rooftop solar hot‑water solution for households. It adopts passive thermosyphon circulation without circulation pump. The non‑pressurized storage tank stores solar heat, and built‑in high‑efficiency copper‑coil heat exchanger pre‑heats incoming mains tap‑water. Potable water is fully isolated from tank‑stored water to guarantee fresh hot‑water and stable shower pressure. Multiple‑capacity options satisfy different‑size‑family hot‑water requirements, optional electric heating ensures hot‑water supply in low‑sunlight weather. Note that auxiliary feed tank is required for tank water refilling. Professional installation and periodic maintenance support long‑term reliable domestic hot‑water performance.
