Before reporting a fault, it is important to establish which type of hot water system you have. There are of course two main types of hot water systems, Gas and Electric.
If your unit is electric and you are not getting any hot water
-Check the switch board to see if anything has tripped.
-Check if any water comes out of the tap. If you have cold water, it suggests maybe the element or thermostat.
-If no water is coming out, please look around the unit for any leaking / over flow of water
In most cases, an electric unit is in the house/…