what is a water heaters explain it
Answers
a device for heating domestic water.
Water heaters are used to transform thermal energy from a fuel source to a stream or reservoir of water. They can be described by their fuel source or may be one of several specific types of heaters. They can be configured to operate in-line, to heat re-circulated streams of water, for direct immersion in an open tank or vessel, or to operate as a booster heater to increase the fluid stream temperature at or near its point of use.
The selection of water heaters should be done on the basis of their type, application and heating capacity. Other important specifications to consider include the energy source and ratings.
Types
Water heaters can be classified for industrial, commercial or residential use.
Industrial Water Heaters
Industrial water heaters are used in a variety of direct and indirect heating applications. Indirect heating is accomplished by using water as a thermal fluid. Convection allows the heat absorbed to be transferred to a closed system. Direct heating of water is used when hot water is a resource used in an industrial application. Common types of industrial water heaters are circulation heaters, immersion heaters and over-the-side heaters.
Immersion Heaters Immersion heaters are used in applications that require immersing the heater in the substance to be heated. Alstrom
Image Credit: Alstrom
Circulation Heaters Circulation heaters are used primarily to heat moving, flowing, or circulating fluid streams. Fluid flows through the heater, which transfers heat to the stream.
Chromalox
Image Credit: Chromalox
Over-the-Side Heaters Over-the-side heaters are immersion heaters that hang over the side of a tank of heated material.
Chromalox
Image Credit: Chromalox
Residential and Commercial Water Heaters
Commercial water heaters are gas, oil or electric-fired devices used to heat water for residential and commercial use. The most common types are storage water heaters and demand water heaters.
Storage water heaters consist of an insulated vessel or tank coupled with a thermostat and an immersion heating element or other heat source. They work by heating up water inside the insulated tank to a controlled temperature. The use of a heated reservoir makes larger quantities of hot water readily available.
Advantages: fuel flexibility; high flow capacity
Disadvantages: standby energy loss
On demand heaters provide hot water without a storage tank. An on demand water heater uses gas, electricity, or propane as the heat source to heat the water and reduces the energy consumption by eliminating the standby losses caused by unused hot water in a tank. An on demand water heater is also known as a tankless water heater. A tankless hot water heater constantly delivers hot water by activating its heating device with the flow of water.
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