Home hot water tank typically features a sealed, pressurized design with an inner tank made of corrosion-resistant materials like stainless steel, often insulated to retain heat and improve energy efficiency. These tanks connect to a heat source — such as a boiler, electric heater, heat pump, or solar thermal system — to heat and store water until it is needed. They are sized based on anticipated demand and can be integrated with other heating equipment to deliver constant hot water at a comfortable, stable temperature throughout a home or building.