Ask Your Question. Angie’s List Answers that influence the cost of replacing a water heater. wanted would be replacement of the water heater that was not .If you are replacing your existing water heater with and supply the water for all of your water heater installation. Related Cost .An electric water heater can cost $ $, or more for complete installation of a conventional storage tank and $, $, or more for a tankless including a V V outlet . Electric water heaters typi.y cost less than gas units but are more expensive to operate..Tank water heaters also tend to provide water more quickly than tankless systems. On average, a gallon heater is good for a household of people, a gallon heater is good for people, and a gallon heater is good for people..
Tank vs. Tankless. Average cost with installation Tank $. gallon tank Tankless $, .