... - quickly hot water,save energy , green product ,ROHS compliance solar energy water heather :Thickness of bracket : 1.5mm galvanized steel coated ... ,360LDiameter of vacuum Tube : 47mm/58mm/70mmLenght of vacuum Tube : 1500mm/1800mm/2100mmActivated Water system /electri assistance /intelligent controlQuality ensure : ISO ,CE solar energy water heater ...