Water heater shells generally use coated steel plates instead of color-coated plates, mainly because coated steel plates have better anti-corrosion performance and durability. The coated steel plate is covered with a special decorative film on the surface, which can effectively prevent erosion by water, air and chemicals, and extend the service life of the product. At the same time, it has good impact resistance and scratch resistance, and is easier to maintain the appearance of the appearance. Although color-coated plates have a variety of color options, their surface coating is thinner and is easily affected by the environment in long-term use, causing corrosion or fading. Therefore, in applications that require high durability, such as water heater shells, coated steel plates are a more suitable choice.