We have own vacuum tube factory with daily output more than 7000 tubes.

Material                 Apply for high 3.3 borosilicate glass

Models                  58*1800, 47*1500, 47*1800, 58*1900, 70*2000

Structure                 all-glass-coaxial double-layer tubes

Outer tube diameter        47, 58, 70

Inner tube diameter        37, 47, 58

Length of tube            1500, 1800, 1900, 2000

Thickness of tube          1.6mm, 2.0mm

Heat absorption efficiency   94-96%

Emittance                 4-6% 

Transmittance of outer tube   91%

Vacuum tightness           5.0^×10^-3Pa

Stagnation te4mperature      280-300

Resistant hail               25mm

Solar irradiation for obtaining a preset water temperature  H≤4.7MJ/M²(Φ58)

Ideal heat collection efficiency in extreme cold water, with hot water available at a temperature of -30°C

Life span 15 years

Usually, for pressurized solar water heater, people use the copper heat pipe in vacuum tube. Heat pipe vacuum tube has advanced heat transferring, when the excellent vacuum tube selective absorption coating combination with copper heat pipe, it could be started quickly to turn solar energy into thermal energy even during cloudy days.

Welcome your inquiries.