Most people have always owned massive tanks in their garages or in the attic that heats up water in their homes. These units come in 40 or 50 gallons and are always on throughout the day and night whether the family is home or not. Over time, these appliances consume a lot of energy that increases their bills and hence money out of their pockets. A good solution to this waste is a tankless water heater. With this system, water is only heated on demand or when a homeowner needs to use it. A gas water heater or a tankless electric water heater may also need to be kept in tip top shape if you want to rip the benefits of efficiency.