An innovative new shower purifies and reuses water, reheating it in the process. Potential water and electricity savings potentially can be large, especially in big households. The technology is the same as used on spacecraft. Downside is it is expensive and requires a bathroom remodel if not installed as part of new home construction. Hopefully the price will drop, as this seems a good idea.
The Shower of the Future is based on the technology that is used on spacecraft, and works on a closed-loop water system. Because of this it only needs 1.3 gallons (5 liters) of water to function, which is about one tenth less than classic showers need. After the first use, the water is collected from the drain, filtered and purified, and fed back into the in-flow tank to be reused. Apart from the water savings, the shower is also capable of saving more than 80% in energy consumption