"A space heater is a device used to heat a single, small area; central heating is used to heat many connected areas, such as the rooms ...
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of a house. Space heaters are powered by electricity or a burnable fuel, such as natural gas, propane, fuel oil, or wood pellets. Portable space heaters are usually electric, because a permanent exhaust is needed for heaters which burn fuel." - (en.wikipedia.org 02.03.2020)
