There are many brand available in the market for water heater, for example: Ariston, Gainsborough, Sanken, Solahart, Daalderop, Stiebel Eltron, GE and many others.
There are many type of water of water heater; for industry like hotels, spas, or for home usage. Typical house uses of hot water are for cooking, cleaning, bathing, and space heating. Steam, in most cases are not produced by water heater but boiler. Boiler is more common in manufacturing instead of water heater.
Water heating is a thermodynamic process using an energy source to heat water above its initial temperature. Water is traditionally heated in vessels known as water heaters, kettles, cauldrons, pots, or coppers. These metal vessels heat a batch of water, but do not produce a continual supply of heated water at a preset temperature. Rarely, hot water will be naturally occurring, usually from natural hot springs. The temperature will vary based on the consumption rate of hot water; the water becomes cooler as flow is increased. However today piping technology are able to reduce the heat losses.
Appliances for providing a more-or-less constant supply of hot water are variously known as water heaters, hot water heaters, hot water tanks, heat exchangers, calorifiers, or geysers depending on whether they are heating potable or non-potable water, in home usage or industrial use, their energy source, and in which part of the world they are found. In home installations, potable water heated for uses other than space heating is also called domestic hot water (DHW).
In many countries the most common energy sources for heating water are fossil fuels: natural gas, liquefied petroleum gas, oil, or solid fuels. These fuels may be consumed directly or by the use of electricity (which may derive from any of the above fuels or from nuclear or renewable sources). Alternative energy such as solar energy, heat pumps, hot water heat recycling, and geothermal heating, may also be used as available, usually in combination with backup systems supplied by gas, oil or electricity. Major types of water heater are discussed here, please check others page above.
Energy efficiencies of water heaters in residential use can vary greatly, particularly based on manufacturer and model. However, electric heaters tend to be slightly more efficient (if one omits the power station losses) with recovery efficiency (how efficiently energy is transferred to the water) reaching about 98%. Gas fired heaters have maximum recovery efficiencies of only about 86% (the remaining heat is lost with the flue gasses). Overall energy factors can be as low as 80% for electric and 50% for gas systems. Natural gas and propane tank water heaters with energy factors of 62% or greater, as well as electric tank water heaters with energy factors of 93% or greater, are considered high-efficiency units. Energy Star-qualified natural gas and propane tank water heaters have energy factors of 67% or higher; direct electric tank water heaters are not included in the Energy Star program, however, the Energy Star program does include electric heat pump units with energy factors of 200% or higher. More about this can be read on COP.
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