Pre-heated pressure system 1.Pre-heated pressure system with copper coil in side 2.Pre-heated pressure system need pressure Pre-heated pressure system, Pre-heated, solar hot water1 ... . Easy plug-in installation 6. Assistant tank capacity 2L, 5L, 10L, 20L, 30L, 60L, 100L, 150L etc.Pre-heated pressure system, Pre-heated, solar ...