... the copper pipe, reliable quality, free maintenance, can stay for 15 years. Slinky appearance, easy installation, not easy to be ... per gallon of one-day's hot water use. StructureThe flat panel are simple, efficient design, durable and economical for application ... .Casing: strong aluminum frame with anodized surface. Multicolor surface color of the casing.-typhoon and sea-water resistant design.Cover ...