Compact Flat Panel solar water heater 1.ISO9001,CE,SRCC,EN12975 2.Tinox blue titanium coating 3.Whole-plate ultrasonci weldin Flat Plate CollectorsFlat plate collectors are the most common solar thermal collectors. They are most appropriate for low temperature applications, such as domestic hot water heating. Flat plate series water heaters maximizes solar heat gain, minimizes heat losses, and ...