The Bosch Nexxt 100 WFMC1001UC 27" Front Load Washer savex energy and water
Any gas-powered washer will be efficient, although consider the Maytag industrial line of washers for maximum efficiency.
LG brand is considered the most cost effective and energy efficient brand for washers and dryers.
Water
Gas-fired, storage-based water pumps are the most energy efficient type.
The most fuel efficient cars can be compared using the motoring magazines but for comparisons tailored to specific vehicle usage, you cannot beat the comparison websites.
One of the most energy efficient water heating methods is the heat pump water heater. This method is proven to be two times more efficient over the standard electric water heater.
Water
Try any industrial Maytag washer. They're great with water usage and have massive capacity to boost. camera model BWCD-200SR has low water settings.
There are great energy saving washers made by GE that are priced cheaper than most.
Power plants
The machine only needs to be loaded, and told what is the most delicate garment in the wash. It then evaluates other wash factors to create the "perfect" wash--lowest possible noise, cleanest rinse, appropriate detergent, and appropriate water usage
the most important usage for water is drinking and bathing