Electric heaters convert electrical energy into heat. Since the discovery that electricity passing through wires can produce a thermal effect, many inventors have been engaged in the research and manufacturing of various electric heating appliances. The development and widespread application of electric heating, like other industries, were in their infancy in the 19th century. Early electric heating appliances were crude and primarily used for domestic purposes. They followed a pattern of gradual expansion: from local to international, from urban to rural areas, from communal use to households, and finally to individual use; and from low-end to high-end products.
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