I feel your pain.
I think I'm on my 4th hot water heater, lucky someone has been home when they go.
Always worried I'd go away and a washing machine hose or hwh would go and flood the whole cellar.
How's this for a great new product:
Design a valve that will shut off your main water supply if it continues to run for say an hour uninterrupted, and needs to be manually reset if it trips?
Whatdya think?
I've seriously thought about this, I think it would be great.
Of course, I thought "Peckers" would be a great bar for women (like hooters), til someone brought up the gay angle
Bill