It depends on how you are using the term “efficiency”. The electrici energy input to an electric space heater is converted primarily into heat with some of the power also converted into light and kinetic energy (both of which would also contribute to warming the room). Also remember that generating electricity itself is highly ineffiient as compared to alternative direct combutstionheating sources such as natural gas. When many people ask about “efficiency” they are using the term less as an thermal engineering metric but rather in a layman’s sense as to which type of space heater will make you feel warmer most quickly and at least cost
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