... temperature preservation;8. Easy plug-in installation;9. Water tank: Stainless steel inner tank;10. Ideal for commercial solar water heater ... , 36pcs.Inner tank0.4mm-0.6mm thickness, SUS 304-2B Stainless steel.Water capacity120L, 160L, 180L, 200L, 240L,300L,360L. Wiring ...