"terry" wrote

My electric company says that my hot water costs, typically, less
than 20% of my total electricity bill. In my case as a single person
less than that. So even if that could be reduced by one quarter the
reduction in cost each month would hardly be significant. maybe 30
cents per day; at best?

Look another way. 30cents a day adds up to 30x30=9$ a month. It may not be
much, but it's a decent lunch a month when eating out, or 2 at many a fast
food place.