Why is there no hot water?
Check the power supply: For electric wall - mounted boiler water heaters, make sure the power cord is plugged in and the circuit breaker hasn't tripped. For gas - fired ones, ensure the gas supply valve is open and the gas supply is normal.
Check the water supply valve: Ensure that the cold water inlet valve and the hot water outlet valve are fully open.
Check the thermostat setting: See if the temperature setting is too low. If so, adjust it to an appropriate temperature.
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