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The most cost effective solar product ！
Max water temperature during summer : 98 degree celsius
20 tubes (2 to 3 family menbers)
24 tubes (3 to 4 family menbers)
30 tubes (4 to 5 family menbers)
36 tubes (5 to 6 family menbers)
Water tank capacity starts from 120 litres
Free electricity heating device for backup usage (worth HK$1,500)
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