My thoughts are that it would probably be more cost-effective to keep it on all the time. I am sure it wopuld take more energy to heat the water from cold esach time than to just keep it at the same temperatre controlled by the thermostat. If you boil a kettle it takes much longer to heat from cold than if you turn it on again after the water has recently been boiled :)
AC is through Empower, not DEWA so is a separate billl
...does it cost much more if you leave your hot water turned on all the time? We've only been here a couple of months, and have been switching our hot water on 15 minutes before showers in the morning, and then turning it off again all day, to keep costs down. We had our first Dewa bill the other day, but because we've got nothing to compare it to, it's hard to know if it makes much difference cost wise to keep switching it on and off, or just leave it on all the time. Getting a bit annoyed at having luke warm showers in the mornings :-(
Oh and who pays the AC bills? I didn't see any AC amount on the Dewa bill....
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