High‑Efficiency Non‑Pressurized 50 Vacuum Tubes Solar Collector SUN Heater
High‑Efficiency Non‑Pressurized 50 Vacuum Tubes Solar Collector SUN Heater is large‑scale open‑loop evacuated tube solar thermal unit built for heavy‑demand hot‑water scenarios. Equipped with 50 pieces high‑performance borosilicate vacuum tubes, this non‑pressurized collector assembly serves as core heating module for centralized hot‑water projects. It can work with matched non‑pressurized storage tanks via passive thermosyphon or active pump‑driven circulation. Designed for households with large‑volume consumption, dormitories, small hotels and public shower facilities, it cuts conventional energy consumption and delivers stable hot‑water output under ample sunlight. Auxiliary heating devices can be connected to secure continuous hot‑water supply in low‑sunlight conditions.
Working Principle
- Fifty pieces of selective‑coating evacuated vacuum tubes capture solar irradiation. Solar energy converts into heat and warms water inside the all‑glass vacuum tubes. Vacuum layer inside each tube greatly reduces radiative and conductive heat loss to maintain high collecting efficiency even in cool ambient temperature.
- Two available circulation modes support flexible project matching. For passive thermosyphon setup, density difference between hot and cold water drives natural gravity circulation between collector manifold and non‑pressurized storage tank without electric power. For active configuration, circulation pump and differential‑temperature controller push water circulation between collector array and storage tank, allowing more flexible tank placement.
- This is non‑pressurized open‑loop design. Water flows directly through vacuum tubes and collector manifold. Hot water transfers heat into storage tank for domestic usage. An auxiliary feed tank with float‑valve is required to maintain stable water level for the whole system. Direct connection to high‑pressure municipal tap‑water is prohibited.
- When solar gain cannot reach target temperature on cloudy or rainy days, external auxiliary heating sources such as electric heaters or boilers can be linked to the storage tank to compensate heat output for consistent hot‑water supply.
Important note: Verify rooftop or ground mounting load‑bearing capacity before installation. In cold frost‑prone zones, drain‑back mechanism must be configured to empty water out of vacuum tubes during freezing nights to avoid tube cracking. All‑glass vacuum tubes contain water inside; physical impact will cause breakage and water leakage. System works under atmospheric non‑pressurized condition; never apply municipal mains pressure to collector manifold. Regular inspection of pipe joints and sealing rings is required for long‑term stable operation.
Core Technical Specifications
‑ Vacuum Tube Quantity: 50 pieces ‑ Vacuum Tube Parameter: Φ58×1800mm borosilicate 3.3 glass, magnetron sputtering selective absorbing coating, solar absorption rate ≥93%, low emission rate ≤0.06 ‑ Total Aperture Area: Around 5.0 m² effective solar collecting area ‑ Manifold Header: SUS304 inner chamber, color‑coated galvanized outer casing, high‑temperature silicone sealing rings ‑ Working Condition: Non‑pressurized atmospheric open‑loop system ‑ Circulation Mode: Passive thermosyphon circulation or active pump‑driven forced circulation optional ‑ Matching Storage Tank Capacity: 500‑800L non‑pressurized tank recommended ‑ Mounting Bracket: Heavy‑duty hot‑dip galvanized steel bracket for rooftop or ground installation ‑ Hail Resistance: Tolerates 25mm‑30mm hail impact under standard installation ‑ Typical Service Life: 12‑17 years under standardized routine maintenance ‑ Certifications: CE, ISO9001 available for global export shipments
Application Scenarios
‑ Large‑size multi‑generational households with high daily hot‑water consumption ‑ Staff dormitories, worker camps, public shower facilities ‑ Small‑sized hotels, guesthouses and resort auxiliary hot‑water projects ‑ Rooftop and ground‑mount solar thermal engineering projects, new construction and energy‑saving retrofits ‑ Regions with abundant solar irradiance; can operate with drain‑back kit for cold‑climate deployment
The collector array needs minimum 4‑6 hours effective direct sunlight each day. Keep the surface of vacuum tubes free from tree shade, building shadow and dust accumulation. Confirm supporting structure load capacity before equipment delivery and installation.
| Feature | 50 Vacuum Tubes Non‑Pressurized Solar Collector SUN Heater | 30‑Tube Non‑Pressurized Vacuum Tube Collector | Flat‑Plate Solar Collector Array |
|---|---|---|---|
| Effective Collecting Area | Approx 5.0 m² | Approx 3.0 m² | Same area level as reference |
| Tube Internal Condition | Water flows inside all‑glass vacuum tubes | Water flows inside all‑glass vacuum tubes | No water inside absorber plate |
| Circulation Options | Passive thermosyphon / active pump circulation | Passive thermosyphon / active pump circulation | Active forced circulation mostly |
| Freeze Protection | Need drain‑back system for cold zones | Need drain‑back system for cold zones | Antifreeze glycol closed‑loop solution |
| Recommended Matching Tank | 500‑800L non‑pressurized tank | 300‑500L non‑pressurized tank | Pressurized or non‑pressurized tank optional |
| Best‑fit Scenario | Medium‑size commercial & large‑family hot‑water | Large‑volume household usage | Modern building aesthetic‑oriented projects |
Key Buying Considerations
- Structure load check: Confirm rooftop or ground mounting frame can support total weight of full collector set plus matched storage tank.
- Anti‑freeze configuration: For frost‑prone locations, drain‑back assembly is mandatory to drain residual water from vacuum tubes to prevent cracking.
- Tank matching: Select proper non‑pressurized storage tank volume according to local sunlight and daily hot‑water consumption; auxiliary feed tank with float‑valve is necessary for water level control.
- Circulation selection: Choose passive thermosyphon for cost‑saving if tank can be installed above collectors; select active pump‑driven mode for flexible tank layout.
- Quotation confirmation: Check complete scope including 50 vacuum tubes, manifold header, heavy‑duty mounting bracket, sealing accessories; clarify whether drain‑back parts and feed tank are included.
- OEM support: Custom manifold material, bracket coating and brand logo for bulk export orders.
- Export compliance: CE and ISO9001 certification documents can be provided for overseas customs clearance.
Installation & Routine Maintenance
Installation shall be completed by professional solar thermal installers. Adjust collector tilt angle according to local latitude to maximize solar radiation reception. Complete water‑filling and leakage test before system commissioning.
‑ Every 3‑6‑month inspection: Clean dust and dirt from vacuum tube outer surface; check manifold sealing rings, pipe joints for leakage; verify drain‑back device function if equipped. ‑ Every 1‑2‑year professional service: Inspect glass tubes for cracks; check bracket anti‑rust and fastening status; replace aged silicone sealing components.
FAQ
Q: What is the daily hot‑water output of this 50‑tube non‑pressurized solar collector?
A: Actual output depends on local sunlight intensity, ambient temperature and tank matching. Under good solar irradiation conditions, it can heat sufficient hot water to satisfy hot‑water demands for 10‑15 users.
Q: Can this collector work in cold winter regions?
A: The vacuum tube itself has good thermal performance in cold weather. Since water runs inside vacuum tubes, drain‑back system must be fitted to empty water when temperature drops below freezing point to avoid tube breakage. Without drain‑back, it cannot survive freezing climate.
Q: Does this collector come with storage tank?
A: This is collector assembly. Corresponding non‑pressurized storage tank and auxiliary feed tank need to be matched separately according to project requirements.
Final Conclusion
High‑Efficiency Non‑Pressurized 50 Vacuum Tubes Solar Collector SUN Heater is high‑output open‑loop solar thermal collecting module for large‑demand hot‑water applications. Fifty high‑efficiency borosilicate vacuum tubes deliver large solar‑absorbing area. It supports both passive thermosyphon and active pump‑driven circulation modes for diversified project layouts. Matched with proper non‑pressurized storage tank and auxiliary feed tank, it serves large‑size households, dormitories and small hotel hot‑water projects. Drain‑back anti‑freeze kit is required for frost‑prone regions. Professional installation plus periodic maintenance ensures long‑term reliable energy‑saving hot‑water performance.
