I would have a ''bush wash'' so you heat up the water in the kettle, throw in some cold in a bucket and have a good old ''bush wash''!...Takes awhile to wash all over, but who cares, as long as I am clean.
I would then call my insurance company, and see where I stand 'if' my hot water heater is a tad old...They don't fix them if they are.
If not covered by Insurance, save up and get another!
Lots of bush washes to follow....and maybe 3 big showers at my sons place.
I'm so use to going without....makes no diff to me....over the years.