They don’t. Usually, tools that use electricity ‘waste’ energy by generating heat, such as a light bulb or LED light where you want to produce as much light as possible with the least amount of heat as a byproduct.
But since heat is what you are looking for, having it ‘waste’ 100% of the energy is what you want, and it’s not difficult to achieve.
Technically, a tiny bit of energy escapes through some infrared light generated by the heat escaping the room, and maybe if you have a fan attached to the heater to blow the air around it doesn’t count as 100% efficient.
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