... Solar keymark,ISO,RoHS OEM is available AAAAA fast heating It's made by copper,aluminium,stainless steel All ... )fast start-up and response, it passes heat to water tank quickly. It can collect solar heat even in ... withstand high pressure. It can connect with system of tap water. (4)Water doesn't run in inner of double vacuum ... . (7)Available size: 47mmX1500mm, 58mmX1800mm Excellent solar water heater