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What Electric Heater is Most Efficient? Some electric heaters are more energy efficient than others. They use less power per hour to warm up your area, which will save you cash on your energy costs with time. They also come with integrated thermostats, so you can set a comfortable temperature and they'll keep the space at that level without overshooting. You can also count on clever functions that let you track your energy usage in kilowatt hours. 1. Oil-fill