Electrical
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Variety of Product |
Modern Jeans |
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Color |
Red |
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Shape |
M |
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Length |
30cm |
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Weight |
0 |
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Maturity |
None |
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Remark |
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Electric water heaters are often used in domestic settings to supply hot water to small residential and commercial buildings. A common -and generally older- alternative to an electric water heater, is a gas water heater, which uses gas for generating heat instead of electricity. Water heaters are often installed in the basement/cellar of a building. They heat water for use in kitchen sinks, bathroom showers, and any other place where hot water is desired.
Hot Water System
Electric water heaters typically heat water via resistor elements that are powered by electricity. However, other designs of electric water heaters are available e.g. electrode boiler, but they are not used for domestic hot water applications. Because resistor type water heaters use resistor elements, they are also known as electrical resistance water heaters.
Cold water is fed to the bottom of the heater tank via a dip tube and is then heated by electrical resistors. As the water is heated, it rises to the top of the tank due to natural convection and is discharged through the hot-water outlet for use elsewhere in the building.
Electric Water Heater Parts
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The heater tank is usually manufactured from stainless steel, with its inner surface protected by a glass-based coating, glass-based lining, or enamel. Polymer-based coatings are used in some newer models, but this is not common.
The tank is surrounded by insulation to reduce the amount of heat that is lost to the surrounding air, thereby increasing its efficiency. The image below shows fibreglass insulation, which a common type of thermal insulation.
Thermal Insulation
Cold water is fed to the water heater via the cold-water inlet, flowing through the dip tube to the very bottom of the tank. Considering the process of natural convection, introducing colder water at the bottom of the tank ensures it naturally rises to the top of the tank as its temperature increases; this occurs because the density of the water decreases as its temperature increases. Convection also dictates that the water temperature will vary at different levels in the tank, with the coldest water gathering at the bottom of the tank and the hottest at the top.
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