solar water heater buyer need to pay attention to the following three major points:
1 tank, insulation material,the thickness of the liner material is not enamel or stainless steel,or stainless steel thickness,the actual capacity of water tank.
2 stents, stent material and thickness.
3 vacuum and length of standardization, Overall color is consistent/whether the color is dark blue/the tail is bright mirror,Also need to pay attention to parts quality.
