... anti-corrosion tank 4.OEM available Rooftop Unpressurized Solar Water Heater with Vacuum Tubes High anticorrosion tank: SUS304 food grade ... aluminum, stainless steel, multiple absorption, multi-heating, stronger power to produce heat; The product adopts the industry’s ... Red or white is optional, beautiful and fashionable, heat-resistant, acid and alkalis resistant, no possibility to accumulate dirt ...