Regarding this, do immersion heaters have a reset button?
Cut the power to your immersion heater by switching the circuit breaker off. Remove the lid that protects the upper heating element of your unit. Carefully remove the plastic safety cap and try not to touch any wires and other electrical fixtures. Press the small button that has “Reset” written next to it.
Thereof, how do I reset my electric hot water heater?
Moreover, why do I have cold water but no hot water?
If there is no hot water or the supply is not adequate or is too hot, check the upper thermostat. If the thermostat is busted, it should be replaced. Lack of regular maintenance can cause issues even though the thermostat is working because of sediment buildup. To fix this, flush your water heater.