I dont really understand why they would need a timer, if it is working on a thermostat....
If they have kids thats probably to make sure it gets turned off,turn it up to 90 degrees take their shower and go.
I know my kids have no clue what the off switch is for.
DAD, the off switch is so that OTHER PEOPLE can turn it off after i
am done with it... are you NEW, or something?..... GEEEZZZZZ!