Sell BY-A420/47-85L

Taking off reflector, increasing the evacuated tube length and tube density. This feature is to reduce the wind resistance, avoid aging of reflector, decrease the solid granule and light pollution. It also helps to ease off snow accumulation during winter season. For a similar tank volume, by increasing tubes length and their densities. It can achieve a better heat absorbance.
Three options of tank volume can meet different customers in different weather condition.
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sample is acceptable