If the water heater is putting out very little hot water, the problem may be a simple fix . The thermostat might need to be turned up just a bit. However, we suggest not going over the recommended 120 degree temperature . On gas units, the pilot light must be inspected to ensure it is working properly; the thermocouple may need to be replaced. However, if the pilot light turns off each time it is lit, the unit has a faulty pilot control valve. On electric water heaters, the problem may involve a faulty electrical heating element.