Natural Gas Water Heaters offers an incredible variety of diverse products for water heating, combination heating and storage applications. After Westinghouse introduced the alternating current to the U.S., water heaters began consisting of an insulated tank and a heating source that was either electricity or gas. The heating source, either electric immersion elements or gas burner, heated the water until the water temperature in the tank rose high enough to trip an automatic resetting thermostat. When tripped, the thermostat would turn off the heat source. As hot water was drawn out of the tank during use, the water temperature dropped below the thermostat setting. At a preset temperature, the thermostat would reset, activating the heating source to heat the new water. Over the past 70 years few changes have be made to either storage-tank or tankless water heaters. My websites: Complete home elevators Natural Gas Garage Heaters