vacuum tube

Specification of All-glass Vacuum Tube

A) Structure: all glass concentric dual layer tube

B) Glass material: borosilicate

C) Absorptance: >0.90

D) Emittance: <0.08 (80)

E) Vacuum: <5x10-5 Pa

F) Stagnation: >230 ./KW

G) Average Heat Loss: <0.8 w/ .

H) Service life: more than 15 years

solar water heater vacuum tube