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In a lot of places in the world fresh water is not an issue and a higher rate of usage actually helps with sewer systems and prevents them from clogging.

However recovering the waste heat from a shower, e.g. by running the drain water trough a heat exchanger with the freshwater would already help saving a lot of energy.

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Indeed, my main issue with my shower is "why tf doesn't this thing have some heat recovery". But that wouldn't be considered an alternative to more radical solutions like a mist shower in the same way a water cycle would.

In warmer climates you can capture waste heat from your a/c and heat water at the cost of running a small recirculating pump.

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