... Solar Water Heater System Features:1. High Efficient:Excellent selective absorbent coating and perfect combination ... winter days.Specification:1).Vacuum tube: 58mm*1800mm,High borosilicate glass,hardness 3.3, with Al- ... 200,250,300Liter12)Product Weight:about 72,82,98,110,136,156Kg vacuume tube technical parameter Length ... /Galvanized steel/Aluminium alloy 2013 High Quality Pressure Solar Water Heater System