1.Solar vacuum tube: 3.3high borosilicate glass 2.100000Btu/day based on 1000watt/m2 3.SRCC.Solar Keymark.CE.ISO solar vacuum tube: Vacuum tube: 3.3high borosilicate glass The vacuum tube of our solar water heater has the high absorption rate and low emission rate,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*0.0001Paidle sunning property ...
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