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.
