Hot-water tanks, also known as boilers, are large containers that store heated water for use in a variety of applications. They are typically made of steel and insulated to maintain the temperature of the water. Hot-water tanks are used in residential and commercial settings to provide hot water for showers, dishwashers, and other uses. They are also used in industrial settings to provide steam for power generation and other processes. Hot-water tanks are an essential part of many heating systems and can be powered by electricity, gas, or oil.