heat pipe solar water heater

heat pipe solar water heater:Heat Pipe Vacuum Tube Technical specification Material: borosilicate glass according to ISO9001:2000 Transmittance of borosilicate glass: 0.92 Absorbance of solar selective absorptive coating: 0.94 Hemispherical remittance: 0.08 Getter: according to GB/T9505-1998 Copper Heater pipe: φ8×0.8×1500 or φ8×0.8×1800 Start-up temperature: no more than 25 Start-up time: no longer than 2 minutes under normal sunshine. Low temperature resistance: no breaks at -30 Heat impact resistance: no damages after over 3 times' alternative impacts of cold water below 25 and hot water over 90. Pressure resistance: can withstand 0.6Mpa Hail resistance: no damage by the impact of Φ25mm hail