Why is it not used again and wouldn’t it be very efficient to combine with a heat pump for reuse?
Especially since water from shower or sink isn’t usually very dirty, couldn’t it be stored for a while in an isolated tank so that e.g. a heat pump can run more efficient on it than on usually colder air or colder ground water?
In: Engineering
Because it’s inefficient. You would need much better insulation and an efficient system of doing this. All of this costs money and more than likely renovation. Why spend a shit ton of money to save dollars over the course of a year? For newer homes, why spend the investment on something that doesn’t pay for itself for decades. What you are describing is saving dollars for something that costs much more to invest.
By the time water comes out, it’s less than 100 degrees. It then hits colder air and a cold tile/wall/surface, goes down a cold pipe and then what? It circulates at a much cooler temperature USING ENERGY to maybe warm something’s a tiny amount.
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