Posted: Sat Oct 18, 2025 3:07pm
It very much depends on the sort of water heater that you have. Many will have timers, so you can have it heating for a couple of hours a day, around the times when you will be most likely to need hot water; some can be set to heat at 'off peak' times to take advantage of cheaper electricity tariffs (if that is how your electricity account / product is set up).
The very important thing is that the temperature setting must not be lower than 60'C for storage and not lower than 50'C when delivered, to minimise the risk of Legionnaire's disease.
If you've just moved in to a property, hopefully the previous occupiers have left the manual for the water heater - if not, you can probably search for a copy of the manual online via the manufacturer's website and download a version.
Hope this helps!