• solar vacuum tube
• borosilicate insulated glass
• heating element included
• exact as on picture one pc

Product Description
Standard vacuum tube : Vacuum tube:
3.3high borosilicate glass
the absorption rate is 0.90-0.93 (AM1.5)
the emission rate is 0.05-0.075 (80?±5?)
vacuum tightness is P?5.0*0.0001Pa
idle sunning property parameters is Y=?.?/KW
the average heat loss coefficient is Ult=0.6-0.7W(?.?)

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Solar Water Heater Vacuum Tube 1pc

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