The fascinating thing about showering is that there are quite a lot of ways to reduce your consumption of heating or water. E.g.:

- shower less often (e.g. to have one day every 10 days without showering means saving 10%!)

- shower with cold(er) water

- shower a minute or two shorter (also please stop showering in the middle for the soap)

- use a different sprinkler head that uses less water or don't crank up the tap as much

well, at least I find it fascinating...