What is space heater? How to use in English

The term "space heater" can be traced back to the early 20th century when electric heating technology started to become more popular. This type of heater was designed to heat a specific area or "space" rather than an entire room or building, as was the case with central heating systems. The concept of a space heater was initially introduced in the late 1800s with the invention of radiant heaters. These heaters were designed to direct heat in a specific direction, which made them more efficient at warming small areas. However, radiant heaters were bulky and expensive, making them impractical for most people. In the 1920s, electric heating technology became more advanced, and companies started to produce space heaters that were smaller, more affordable, and easier to use. These heaters typically featured metal or ceramic elements that would heat up and radiate warmth, making them ideal for heating smaller spaces such as bedrooms, offices, and apartments. Over time, space heaters have become increasingly efficient and technologically advanced, with features such as thermostats, energy-saving modes, and automatic shut-off functions to prevent overheating. Today, space heaters are a common and convenient way to heat smaller spaces, particularly in regions with colder weather or in buildings that lack central heating.