... available 4.Long lifetime. pressurized and split solar water heater:solar collect:The collector absorbs solar energy and ... transmits it to the water tank through circulation. When the temperature of the ... vacuum tubes with heat pipe: 14, 16, 18, 20, 24, 30, or 36 units.9.Water capacity: 100L, 150L, ... solar collector tube by 15 Heat pipe split pressure solar water heater