Gas Water Heater
The most common water heater in the United States is a gas tank type water heater. A gas water heater is generally fueled by nateral gas or propane with a few units using diesel fuel. Gas fueled units come in tank type, tankless and hydrid units. A gas fueled unit will have a gas pipe feeding the unit and a flue pipe to exhaust the burnt fuel gasses.Notice the gas control valve on the front of the heater.