Gas water heaters rely on natural gas or propane to heat the water. The installation cost for a gas water heater can range from $500 to $2,500. If you beloved this report and you would like to get additional information relating to Click Link kindly check out our own site. Installation costs depend on the tank size and any additional work needed. But remember that while gas models are less expensive to operate, you do need an existing natural gas line to be able to use them.