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The heater is used to raise the temperature of a room. It has two states of power consumption: low and high. In its low state, the heater produces no heat but still requires 10 W. It can be used to raise the temperature of a room to a comfortable 20 degrees Celsius (room temperature) in the winter or create a walk-in heat trap for your foes. In any cold biome, such as the Tundra, the heater is a necessity for any base.
In addition to providing heat, the heater will illuminate a small area surrounding it with red light.