Electric heaters can operate at efficiencies very close to 100%. This does not contradict the fact that Carnot engines are the most efficient heat engines because

Question

Quizplus · Accepted Answer

Electric heaters convert electrical energy directly into heat without performing mechanical work in the process, unlike heat engines which convert heat into work. Therefore, the efficiency of electric heaters is not limited by the Carnot efficiency, which applies to heat engines that operate between two temperatures.

Electric Heaters Can Operate at Efficiencies Very Close to 100