... plate solar water heater 1.high pressure 2.good quality 3.easy to intall 4.OEM service Flat plate solar water heaterFeature:Flat ... style structure, high heat effect, high hot water produced, anti-insolate, water heated in the copper pipe, reliable quality, free maintenance ... all copper core, heat pipe diameter:22mm/25mm. Few welding line, high intension, and strong pressure resistance. 4. Coating: ...