The present invention relates to a water heater equipped with a leakage detecting device. To achieve the water heater, the present invention includes: a flow control valve that is disposed at an inlet and controls the flow rate of water flowing into the water heater; a leakage detecting device that detects when water which has flowed in the water heater leaks out through pipes in the water heater due to burst of the pipes and is filled at or more than a predetermined level from the floor of a water heater case, and then transmits a signal to a controller; a case that protects parts in the water heater by shielding the parts from the outside; and the controller that controls a series of combustion processes and operation of the water heater, and closes the flow control valve, when a leakage detection signal is transmitted from the leakage detecting device. According to the above configuration, when water is filled at a predetermined level in the water heater by bursting of pipes inside the water heater, the controller connected with the leakage detecting unit detects the leakage and closes the flow control valve, such that it is possible to prevent damage to the water heater itself due to burst of the pipes inside the water heater and cor¬ responding second damage.