Insulated storage tanks are tanks with insulation media and insulation layers, corresponding to single-layer storage tanks. Insulated storage tanks are designed to keep the temperature of materials from decreasing, maintain a constant temperature, and prevent heat loss. Common insulated storage tanks include hot water tanks, cold water tanks, and insulated liquid storage tanks. Insulated storage tanks can also be equipped with electric heating devices, which can provide insulation and heating at the same time. Insulated storage tanks are vertical or horizontal tanks, which can be fully insulated, that is, fully insulated, or semi insulated, that is, only partially insulated. Insulated storage tanks are slightly more complex in structure than single-layer tanks, and can maintain cold and heat, prevent heat loss, and are a very environmentally friendly storage tank.