Compact non-pressure solar water heater 1. 30 vacuum tubes, diameter 58×length 1800mm, ≒300liters vacuum tube:high-temperature tube, at least 15years service life 2. outer tank : SUS304-2B 3. bracket : SUS304-2B 4. inner tank : SUS304-2B food grade stainless steel sheet, thickness : 0.4~0.4mm 5. heat insulation material : Polyurethane, thickness : 50mm 6. bracket angle : ≒35。 7. 1.5KW Heater×2 sets(option)