... friendly 2.energy saving solar water heaters,solar water heater,Flat panel compact pressure systemHorizontal pressure water tank 1.Type of tank Pressurized, , working ... performance of stability. No seaming & anti-leakage for 50 years Blue -Gold Titanium steel innervessel is ... .No metal material in the water tank ,hard forforming chemical transformation ,suitable for any water source even with Ca ,Mg ...