Biggest cost here is Hot Water tank with the 20 min @pooky-jax morning shower hair etc. Routine.
5 min cold shower just ain't gonna happen bro.
I am considering and researching the solar gov schemes here and inserting a water heating factor. Would love to eliminate the 24/7 pre heated electric hot water tank system. Replace it with the solar heated water with a backup of on demand instant hot water system.
My brother years ago had a water heating system on his pool that used his storage shed roof and solar to warm the water.
Hot water can be costly, especially if it's stored. I have that system currently. When it fails I'll be going to gas continuous which heats on demand only. Gas is still costly here, but not as much as electricity. I've not investigated the solar option as far as hot water goes, am pretty set on the gas alternative as it's already plumbed to the house.
Let me know how you go with the solar schemes.