Evacuated Tube Direct Solar Water Heating System
High-Efficiency Solar Hot Water Solution for Commercial, Industrial & Residential Projects
Reliable, factory-direct evacuated tube solar water heating systems engineered for high thermal performance and rapid ROI. Ideal for international distributors, EPC contractors, hotels, schools, hospitals, and industrial facilities requiring large-scale, cost-effective hot water supply.
What Is an Evacuated Tube Direct Solar Water Heating System?
An evacuated tube direct solar water heating system is a high-efficiency thermal solution that heats water directly inside vacuum tubes using solar energy absorption technology.
In a direct (open-loop) system, water flows directly through the evacuated tubes without a heat exchanger. This design provides:
- Maximum heat transfer speed with minimal thermal loss
- Higher overall thermal efficiency due to direct absorption
- Simplified system structure with fewer mechanical components
- Lower initial investment and easier installation
Climate Performance Note
The vacuum insulation between the glass layers significantly reduces heat loss, enabling stable performance even in windy, cloudy, or moderately cold environments.
Technical Specifications (Heavy-Duty Engineering Data)
Our systems are designed for industrial-grade performance, reinforced for harsh weather conditions and large-scale commercial use.
|
Item |
Specification |
|
Vacuum Tube Type |
High-borosilicate glass 3.3, Φ58 × 1800 mm, selective coating |
|
System Capacity |
100L – 500L standard; up to 10,000L+ centralized systems |
|
Inner Tank Material |
SUS304-2B / SUS316L stainless steel (0.4–1.5 mm thickness) |
|
Outer Tank Material |
SUS304 stainless steel / PVDF coated steel (anti-corrosion) |
|
Insulation Layer |
50–70 mm high-density polyurethane foam (up to 72-hour heat retention) |
|
Frame Material |
Galvanized steel (1.5 mm) / aluminum alloy (2.0 mm) |
|
Installation Angle |
20°, 30°, 45° (customizable) |
|
Weather Resistance |
Hail resistance ≤ 25 mm; wind resistance ≤ 35 m/s |
|
Working Pressure |
Non-pressurized / low-pressure gravity system |
Direct vs. Indirect Solar Water Heating System
Choosing the correct system type is critical for project efficiency and ROI.
|
Feature |
Direct System (Open Loop) |
Indirect System (Closed Loop) |
|
Heat Transfer Medium |
Water directly in tubes |
Antifreeze / glycol fluid |
|
Thermal Efficiency |
Higher |
Slightly lower |
|
Installation Cost |
Lower |
Higher |
|
Maintenance |
Simple flushing |
Fluid replacement required |
|
Freeze Protection |
Limited |
Suitable for -35°C environments |
|
Best Applications |
Tropical / mild climates |
Cold climate regions |
Global Project Experience
We provide complete solar hot water solutions, not just equipment supply.
Latin America: Large-scale solar hot water systems for eco-resorts and hotels in Mexico and Chile
Southeast Asia: Over 80 installations in schools and university dormitories across the Philippines and Vietnam
Middle East & Africa: Industrial-grade systems for textile plants and high-temperature environments
Project documentation, performance data, and installation references are available upon request.
Why Global B2B Clients Choose Us
With over 15 years of manufacturing experience in solar thermal systems, we provide stable, scalable, and export-ready solutions.
- Factory-direct pricing with no intermediary markups
- Strict quality control with 48-hour pressure testing for all tanks
- OEM/ODM customization for branding, structure, and specifications
- Export-grade packaging with reinforced protection for glass tubes
- Spare parts support (1%–2% extra vacuum tubes included for safety)
Frequently Asked Questions
Q: How do you prevent vacuum tube breakage during shipping?
A: All tubes are individually packed in high-density EPS foam and secured in reinforced export wooden crates. Spare tubes are included to ensure installation continuity.
Q: Can this system be used in hard water areas?
A: Yes. However, scaling may occur over time. We recommend SUS316L inner tanks or installing a basic water softening system for long-term efficiency.
Q: Does the system require electricity to operate?
A: No. Standard systems operate using natural thermosiphon circulation, requiring zero electricity.
Q: What certifications do you provide?
A: We provide ISO9001, CE certification, RoHS compliance, and factory thermal performance testing reports. Additional documentation can be prepared for local tenders.
Get a Professional Sizing & ROI Analysis Within 24 Hours
If you are preparing a commercial bid or industrial project, our engineering team can support you with:
- Free system sizing based on project requirements
- ROI and payback period analysis
- FOB / CIF factory-direct pricing
- Technical drawings and tender support
Contact us today to optimize your solar hot water project with professional engineering support.
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