The most efficient type of electric heat is radiant heat, which uses electric elements to directly heat objects and people in a space.
Because the heat is transferred directly to objects, rather than heating the air, radiant heat is more efficient and can be more comfortable than other types of electric heat. Infrared heaters are a type of radiant heater that use infrared radiation to generate heat, and they are considered to be among the most efficient electric heaters available.
Another type of electric heater that is known for its efficiency is the air-source heat pump, which uses electricity to move heat from one location to another, rather than generating heat directly. This can be an effective and efficient way to heat a home or other space.