Not true, it is true that it is heating at %100 efficiency that is to say %100 of the electrical energy is being transferred into heat (although technically some is being transferred into IR light not necessarily what you want) but your goal is probably not to simply create heat your goal is probably to heat the room or at least yourself and their is plenty of waste heat going off into space somewhere also you can achieve more than %100 heat transfer by compressing the external air's heat we call these heat pumps and they can achieve +400%. The key word is efficiency.

Everyone here is talking about heat pumps for being more efficient. pfft

Refrigeration cycle scoffs at your mere 100% efficiency

Well, heat pumps are significantly more efficient than traditional heaters because they move heat rather than generating it. A heat pump can deliver three to four times more heat energy than the electrical energy it consumes, making them 300-400% efficient.

That is how the power supply of my Laptop look like, playing Cyberpunk 2077 on my laptop.

If you want to make heat, start up a gaming PC. At least the energy will go to doing something before it gets turned to heat.

Boo, get heat pump you loser

Turn that entropy up to 11, boi!

Most of the time, we consider heat output to be inefficient. It only works here because heat happens to be its purpose.

You could say it's 0% efficient.

You're objectively wrong here.

People say efficient without saying efficient at doing what with what.