The Spare Vacuum Tube for Water Heaters is a high-performance, double-layered borosilicate glass tube designed to serve as a replacement or upgrade component for evacuated tube solar water heating systems. Engineered with precision and durability in mind, this vacuum tube captures and retains solar thermal energy with maximum efficiency, providing a sustainable, reliable source of hot water for domestic, commercial, and off-grid applications.

At the heart of the vacuum tube's design is a twin-glass configuration with a vacuum-sealed layer between the inner and outer tubes. The inner tube is coated with a selective solar-absorbing material (typically aluminum nitride or copper-based compound) that efficiently converts sunlight into heat. The vacuum between the layers acts as a powerful insulator, minimizing heat loss due to convection and conduction, and ensuring excellent performance even in cold or windy conditions.

These tubes are compatible with both pressurized and non-pressurized solar thermal systems, and can be easily retrofitted into most standard evacuated tube collector frames. Each tube is resistant to thermal shock, corrosion, UV degradation, and extreme weather, making it a reliable and long-lasting solution for extending the lifespan of your solar hot water system.

Whether you're replacing a broken tube or increasing collector capacity, the Spare Vacuum Tube is a cost-effective, energy-efficient, and environmentally friendly solution that ensures continuous hot water availability year-round.

✅ Key Features:

• Material: High-grade borosilicate glass – excellent durability, thermal shock resistance, and transparency

• Double-Layer Vacuum Design: Inner and outer tube separated by vacuum layer for superior insulation

• Selective Absorber Coating: High-efficiency solar absorbing material for optimal heat gain

• Tube Length: Typically ranges from 1.5m to 1.8m (standard options available)

• Outer Diameter: Usually 47mm or 58mm – fits most standard collector manifolds

• Heat Retention: Vacuum insulation minimizes heat loss, maintaining high thermal output

• Weather Resistance: Resists hail impact, corrosion, and UV radiation

• Operating Temperature Range: -30°C to +250°C, suitable for a variety of climates

• System Compatibility: Works with direct or indirect, pressurized or open-loop solar water heating systems

• Easy Installation: Plug-and-play replacement into existing tube sockets or manifolds

🏡 Applications:

• Replacement Tube: Ideal for replacing broken or degraded vacuum tubes in solar water heating systems

• System Maintenance: Keep spare tubes on hand for emergency replacement and system continuity

• Capacity Upgrade: Add additional tubes to compatible manifolds to boost system performance

• Residential Solar Water Heaters: Homes using evacuated tube solar geysers

• Commercial Installations: Hotels, hospitals, schools, and apartment blocks using solar thermal systems

• Off-Grid Installations: Rural and remote areas relying on solar hot water solutions

• Industrial Pre-heating: Supplementing energy needs in factories or laundries with solar thermal heat