pre-heated solar system 1.CE,CCC,ISO,GMC 2.auto water feeding 3.water we use is hot anytime pre-heated solar system Working pricinples:Necessary parts:Optional parts:Detailed Specifications:Inner tank:SUS304 2B food grade stainless steel 0.41mm;Outer tank:SUS 304 BA Stainless steel or color steel 0.41mm;Heat Preservation layer:imported PU 50-60mm;Capacity:150L,180L,200L,240L, 250L,300L; ...