Ok, I know there is the argument about switching off/on a geyser versus the leaving it on all day argument, lets argue that for specific set of circumstance I have found out that the turn off method is saving me money. This choice now seems to have me in two minds. 1 is to keep the geyser on durning times of activity, such as from 7 till 10 at night when everyone showers. Or to turn it on when everyone is finished, assuming the water stays hot enough. Which will mean the you can heat only the amount of water used for each cycle? Any thoughts?