Unique shape solar water heater 1.Superior performance 2.Water purifying core, to improve ... solar working station5) Steel tube dimensions: 58mm x 1.8m, 47mm x 1.5m 6) Water capacity: 150L, 200L, 300L, ... 500L Characteristics:1. It is not easy to be frozen and cracked ... The standards of vaccum tubes with heat pipe: 14, 16, 18, 20, 24, 30, or 36 units8. Water capacity: 100L ...