Front-load washers have been demonstrated to be more energy-efficient than standard top-load washers with a center-post agitator. To be sure, top-loaders with low-profile infusers or impellers outperform front-loaders in terms of efficiency. According to Energy Star, a top-load washer with an impeller qualifies for the certification if it consumes 33% less water and 25% less energy than a regular washing machine.