Water
I turn on the shower, then undress and lay out clothes. It is hot when I get in.
I brush my teeth with cold water. I can wash my face with cold, or wash my face in the kitchen sink.
I guess accept water down the drain before it gets hot in the shower. The water goes into the sewer, then to the sewage treatment plant, then either goes into the ocean or becomes non-drinking water, e.g., waters crops, etc.
My water bill has not been that much lower when I travel for a month and so do not use the shower or sink.
Everyone can decide what is "worth it" to them - For me, it would be a nice luxury to have hot water very quickly after turning on bathroom taps. However, I do not think it would be worth my spending hundreds of dollars.
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