Before contemplating on actual significance of direct vent water heater let’s have a look what the water heaters actually are and how they serve us on our routine life. A water heater also known as thermodynamic system heating system heats the water above its natural temperature. There are variety of water heating systems utilized for cooking, cleaning and taking hot shower/bath and heating space as well. You need not to be apprised of domestic usages of water heaters as some water heating appliances such as water-geyser or water heating rods are the live examples of modern water heating systems offering warm comfy water even during the peaked winter season. The heated water is utilized commercially as well, especially in the factories, in the form hot water as well as steam. Before the modern water heaters were introduced, the people used to heat water in some specific vessels such as water heaters, kettles, cauldrons and pots previously. Be whatsoever the means applied the end was heating the water as it served many purposes and eased even complicated tasks both commercially and domestically. Though common domestic water heaters heat the water and allowing the user to expedite heating/warming-related tasks up to specific period of time, the commercial water heaters are needed to supply the heated water at predetermined/preset temperature continuously. It is consumption of the steamed or heated water that determines constancy of water heating and supply of the hot water calling for a sophisticated water heating system or water heater.