Bro, what? The hot water is already hot, and no, the cost does not change much. The only difference is the storage cost; the energy input will be the same to heat it up (of course, depending on the heat source, the price can change - solar panels, electric, or fossil). And no, your showering is not really a problem. I don’t know where you live, but where I live, personal household use accounts for about 3-5% of the water supply, so saying reducing the shower time or whatever will have 0 impact on water availability.
Bro, what? The hot water is already hot, and no, the cost does not change much. The only difference is the storage cost; the energy input will be the same to heat it up (of course, depending on the heat source, the price can change - solar panels, electric, or fossil). And no, your showering is not really a problem. I don’t know where you live, but where I live, personal household use accounts for about 3-5% of the water supply, so saying reducing the shower time or whatever will have 0 impact on water availability.