The Seven SS Stars 150L Non-Pressurized Solar Water Heater is a compact and energy-efficient hot-water system designed for homes, apartments, small guest houses and other low-pressure water systems.

It uses evacuated vacuum tube technology to absorb solar heat efficiently, while the insulated 150-litre tank helps retain hot water for longer. The supplier lists this model as suitable for households and small commercial applications.

☀️ Key Features

• 🚿 Tank Capacity: 150 litres
• 💧 System Type: Non-pressurized
• ☀️ Heating Technology: Vacuum / evacuated tubes
• 🧪 Tube Material: High-quality borosilicate glass
• 🔵 Number of Tubes: Approx. 15–18, depending on model variation
• 📏 Tube Diameter: Approx. 58mm
• 📐 Tube Length: Approx. 1.8m
• 🧱 Outer Tank: Stainless steel / corrosion-resistant construction
• 🧊 Insulation: High-density polyurethane foam
• 🌡️ Maximum Water Temperature: Up to 95°C
• ⚖️ Approx. Empty Weight: 50kg
• 🌞 Suitable for rooftop installation
• 💧 Ideal for gravity-fed water systems
• 🛡️ 1-year listed warranty

🔥 Efficient Vacuum Tube Heating

The evacuated glass tubes are designed to capture solar radiation and transfer the heat into the stored water.

Benefits include:

• ☀️ Efficient solar heat absorption
• 🌤️ Continued heating in moderate or low sunlight
• 🔥 High hot-water temperatures
• ⚡ Reduced dependence on electric water heating
• 💰 Lower energy costs

The supplier notes that the vacuum tube system is designed for good heat absorption even during cloudy or lower-sunlight conditions.

💧 Non-Pressurized Design

This model is best suited to gravity-fed or low-pressure plumbing systems.

It is ideal for:

• 🏠 Homes with rooftop water tanks
• 🚿 Bathrooms and showers
• 🌾 Farmhouses
• 🏘️ Rental properties
• 🏨 Small guest houses
• 💧 Areas with naturally low water pressure

For homes using high-pressure booster pumps, a pressurized solar water heater may be more suitable.

🧊 Heat Retention

The tank uses high-density polyurethane foam insulation to help minimize heat loss after the water has been heated.

This helps:

• 🌙 Keep water warm into the evening
• 🔥 Maintain useful temperatures for longer
• ⚡ Reduce the need for additional heating
• 💰 Improve overall energy efficiency

✅ Benefits

• Compact 150L capacity
• Uses free solar energy
• Reduces electricity consumption
• Efficient vacuum tube technology
• Stainless / corrosion-resistant construction
• Good heat retention
• Suitable for gravity-fed systems
• Low maintenance
• Easy rooftop installation
• Suitable for homes and small businesses

⚠️ Installation Notes

• ☀️ Install where the system receives strong direct sunlight
• 🧱 Ensure the roof can support the filled heater
• 💧 Use with a suitable gravity-fed water supply
• 🚫 Do not connect directly to unsuitable high-pressure plumbing
• 🔧 Professional installation is recommended
• 🧹 Keep the vacuum tubes clean for good performance
• 🌍 Use proper plumbing, valves and safety fitting