... ,can supply hot water with high quality, clean water copper coil pre-heat solar water heaterDetailed Specifications:Copper coil: diameter 12mm,thickness ... 0.41mm;Outer tank:SUS 304 BA Stainless steel or color steel 0.31mm-0.41mm;Heat Preservation ... tankLength:20mm-30mm,Thickness:1mm,diameter:12mmElectrical heater220V,1500WFrameStainless steel or color steelCapacity:100L,130L, 150L, 200L , 250L,300L ...