new unique design,high quality,beautiful Pressuried solar water heater Pressuried solar water heater:1.inner tank: Q235 steel with enamel coating to ... tube:twin-glass with three-target selective absorptive coating 4.Heat-pipe:copper with 0.7mm thickness. 5.Frame:Aluminum alloy ... . 6.Accessory:Stand,T/P Valve,Magnesium Rod,Electric heater. 7.Connection:G3/4'' male thread Pressured solar water heater