False, an electric heater is 100% efficient (it's a pure resistive load). But these days we can do better, and you would say that we can't to better than 100% e

False, an electric heater is 100% efficient (it's a pure resistive load). But these days we can do better, and you would say that we can't to better than 100% efficiency, but indeed we can with heat pumps, that are 300% efficient or more. Because they use electricity to move heat from one place (the exterior) to another (the interior), and they can transport more heat than the one they consume in the process. Also, you can use nuclear also for direct heating, without passing trough electricity: city near the power plant can use the waste heat from cooling the reactor as city heating, that is with pipes that bring hot water in the homes for heating the radiators or making domestic hot water. Of course that is doable only for a city very near to the reactor, since transporting the heat have losses. But it was common in old soviet cities to use that form of heating.