Detailed Product Descriptionÿÿ1.copper coil in the water tank2.Seven years trading experience3.Perfect credit records.No need searching from now on.We are the best choice for you.ÿSolar water heater Features:1.It can withstand tap water pressureÿwhen its working.Kindly noted that not the storage tank bear pressure but the copper coil.2.Drinking water quality: Its indirect solar system,so the water quality is same as tap water.3.No afraid the storage tank have no water.4.Economical and suitable for use,no afraid the extra cost after installion.5.No need to wait,hot water is stand by anytime.ÿSolar water heater Specifications:1.Inner tank material: SUS304-2B food grade,thinckness 0.41mm.2.Outer tank material:PVDF coated steel/Stainless steel 0.31mm.3.Frame:1.5mm thickness printed galvanized steel/1.2mm aluminum alloy.4.Assistant tank:5L(optional).5.Heat exchanger:Red copper,diameter: í12mm,thickness:0.8mm.6.Heat preservation:72hours.7.Vacuum tube: í58*1800mm single element vacuum tube.