Solar Water Heaters Evacuated Tube Collector

Evacuated tubes are the absorber of the solar water heater. They absorb solar energy converting it into heat for use in water heating. Evacuated tubes have already been used for years in Germany, Canada, China and UK. There are several types of evacuated tubes in use in the solar industry. At Sunlit, we use the "Twin-Glass Tube" technology. This type of tube is chosen for its reliability and better performance.

Technical Specification

Length (nominal) 1800mm / 1500mm
Outer tube diameter 58 mm / 47 mm
Inner tube diameter 47mm / 37mm
Glass Thickness 1.6 mm
Thermal expansion 3.3x10-6 oC
Material Borosilicate Glass 3.3
Absorptive Coating Graded CU-N/CU)
Absorptance >92% (AM1.5)
Emittance <8% (80oC)
Vacuum P<5x10-3 Pa
Stagnation Temperature >200oC
Heat Loss <0.8W/ (m2oC)
Maximum Strength 0.8MPa

Insulated Storage Tank

Inner Tank Material Stainless Steel / Copper
Outer Tank Material Aluminum Cladding
Tank Capacity Customized to Customer Requirement
Inlet/Outlet Pipe Stainless Steel / Brass
Tank Welding Tig Welding /Brazing
Filler Matetial Stainless Steel /Copper
Thermal Insulation Rock Wool / PUF
Heat Retention 72 hours


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  • Focusun Energy Systems :

  • Dr Jaganathan Nagar,

  • Opposite cmc Avinashi road,

  • Coimbatore 641 014.

  • Phone : +91 422 2591069

  • Mobile : +91 9842291069.

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