A water expansion tank acts as a bladder that takes in the excess water from the hot water heater so that ... depend on how large the tank is; a four-gallon tank will cost more than a two-gallon ...

Storage tank: Storage tank water heaters typically have a capacity of 30 to 60 gallons ... can’t generate enough hot water on its own,” says Banta. We tested a 50-gallon Rheem electric ...

Having spent 30+ years in ... gas and electric water heaters are by far the most common. Water is heated and stored in the tank of this type of water heater, also called a hot water heater.