A trio of propane hot water heaters. A hot water heater or water heater is an appliance for heating water above its ambient temperature. In industrial usage, large water heaters are called boilers. Download high resolution version (1280x853, 188 KB) Wikipedia does not have an article with this exact name. ...
Download high resolution version (1280x853, 188 KB) Wikipedia does not have an article with this exact name. ...
Water (from the Anglo-Saxon and Low German wæter) is a colourless, tasteless, and odourless substance that is essential to all known forms of life and is the most universal solvent. ...
In household and commercial usage, most water heaters are of the tank type. These consist of tanks in which a given amount of water is kept continuously hot and ready for use. Typical sizes for household use are 20, 30, or 40 gallons. These may run on electricity, natural gas, propane gas, fuel oil, or other energy sources. The most popular in the United States is the natural gas type. The gallon is a unit of volume used for measuring liquids (as well as dry matter). ...
The article on electrical energy is located elsewhere. ...
Natural gas rig Natural gas (commonly refered to as gas in many countries) is a gaseous fossil fuel consisting primarily of methane. ...
Nodding donkey pumping an oil well near Sarnia, Ontario, 2001 Petroleum (from Latin petrus – rock and oleum – oil), mineral oil, or crude oil, sometimes colloquially called black gold, is a thick, dark brown or greenish flammable liquid, which exists in the upper strata of some areas of the Earths...
Tank-type water heaters can be made more efficient by installation of additional insulation jackets around the tank, flow valve devices at their inlet and outlet, cycle timers, electronic ignition (in the case of fuel-using models), sealed air intake systems (in the case of fuel-using models), and pipe insulation. The sealed air-intake system types are sometimes called "band-joist" intake units. "High efficiency" units can convert up to 98% of the energy in the fuel to heating the water. The exhaust gases of combustion are cool and are mechanically ventillated without the need of a chimney.
Tankless instantaneous or "instant-on" water heaters are also available and gaining in popularity. These water heaters heat the water as the water flows through the device, and do not retain any water internally except for what is in the pipe. Installed at the point of use, these heaters can be far more efficient than the tank type. They are models powered by electricity, natural gas or propane. These type of heaters are also know as "in-line" water heaters
In British English, water heaters are called immersion tanks or geysers. Other common terms are hot water tank, hot water heater and hot water system. The term British English is generally used by people outside of the UK to refer to the variant of the English language spoken in the British Isles. ...
See also
A boiler is a closed vessel in which water or other fluid is heated under pressure. ...
External links - Howstuffworks "How Water Heaters Work" (http://home.howstuffworks.com/water-heater.htm)
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