250L Stainless Steel Non-pressurized solar Water Heater

A 250L Stainless Steel Non-Pressurized Solar Water Heater is a high-capacity, durable, and energy-efficient system designed to provide hot water using solar energy. It is ideal for medium to large households (4-6 people) or small businesses looking for an eco-friendly and cost-effective water heating solution.

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Key Features:

1. Tank Specifications:

• Capacity: 250 liters (suitable for 4-6 people).
• Inner Tank Material: Food-grade stainless steel (SUS304 or SUS316) for hygiene and corrosion resistance.
• Outer Tank Material: Stainless steel for durability and weather protection.
• Insulation: 50-60mm thick polyurethane foam (PUF) for long heat retention (up to 24+ hours).

2. Solar Collector System:

• Vacuum Tubes: High-efficiency borosilicate glass tubes absorb sunlight and heat the water inside.
• Tube Count: Typically 25-30 tubes (depending on the model and tube size).
• Tube Diameter: 58mm (common size) for efficient solar absorption.
• Heat Transfer Process: Uses natural thermosiphon circulation (hot water rises, cold water sinks).

3. Frame and Structure:

• Frame Material: Stainless steel or galvanized aluminum for durability and stability.
• Mounting: Designed for rooftop or elevated installation to maximize sunlight exposure.

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How It Works:

1. Water Supply: Cold water enters the system from a water storage tank.
2. Solar Absorption: Vacuum tubes capture sunlight and transfer heat to the water inside.
3. Natural Circulation: Heated water rises to the storage tank, while cooler water moves down to be heated.
4. Hot Water Availability: The insulated storage tank keeps water warm for use throughout the day and night.

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Advantages:

✅ Energy-Efficient – Uses solar power, reducing electricity or gas bills.
✅ Rust & Corrosion Resistant – Stainless steel construction extends lifespan.
✅ Eco-Friendly – Zero carbon emissions, making it a green alternative.
✅ Low Maintenance – No moving parts, pumps, or electrical components.
✅ Long Heat Retention – Thick insulation keeps water hot for extended periods.
✅ Easy Installation – Can be mounted on rooftops or elevated stands.

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Disadvantages:

❌ Gravity-Dependent – Works best when installed at a higher elevation for proper water flow.
❌ Weather Dependent – Less efficient on cloudy or rainy days (may require a backup heating source).
❌ Space Requirement – Needs sufficient rooftop space for installation.
❌ Initial Cost – Higher upfront cost compared to conventional water heaters.