We turn water of at mains even going away for a week [ had a flooded ensuite once ] Gas and power stays on, Gas to kitchen is turned off though / Hot water is pressure / thermal cut out solenoid activated and only the fridge / freezer plugged in.
Makes sense
Having a shower last Monday, turned off the water , heard a slight noise like water hammer then there was the sound of water spraying still going in bathroom.
The speedy hose for the hot water tap in vanity had just burst.
In the time it took me to jump out of shower, Grab a towel and run out to turn off the mains the bathroom was 10mm deep in water and it was making tracks for the carpet in hallway.
Job next week is to replace all quick connect hoses with soft drawn copper. Only replaced them 2 years ago. So much for their 10 year guarantee.