To avoid overproduction and therefore overconsumption of energy, insulate your water heater, especially if it is in an unheated room.
Set the temperature of your water heater to a maximum of 60║ to limit consumption, and the development of pathogenic bacteria.
If you have this option in your contract, you can program your water heater to heat up during off-peak hours. You will save up to 22% at peak time.
Are you going on holiday or going to be away from home for a long period of time? Switch off your hot water heater, as you are not going to need it.