1) this type of solar water heater works with high pressure, so do the water it prodeces. 2) it uses the heat pipe to delivery the heat energy, it can works rapidly 3) because of no water in the vacuum tube, so there will not tube breakage in the winter 4) each vacuum tubes can work alone, so it can still operate in the event of occasional tube breakage 5) inner tank:macromolecule 6) vacuum tube:al-n/al47-1500/58-1800 7) outer tank:sus304-2b 8) reflector:aluminum component/stainless steel
