A liquid heating cooker comprising: a housing; a liquid vat capable of storing liquid; and a heating unit configured to heat the liquid stored in the liquid vat, and the heating unit comprises a pulse burner, the pulse burner comprises: a combustion chamber provided in the liquid vat; a tail pipe that is connected to the combustion chamber and has a heat exchanging portion located in the liquid vat and bent in a predetermined shape; and a mixing chamber which communicates with the combustion chamber and to which fuel gas and combustion air is allowed to be supplied, wherein when mixed gas including the fuel gas and the combustion gas is exploded and combusted, the combustion exhaust gas is exhausted through the tail pipe to allow heat exchange with the liquid, and the mixed gas is inhaled from the mixing chamber into the combustion chamber, and wherein at least the heat exchanging portion of the tail pipe is bent on a substantially horizontal plane, and the tail pipe has a first end connected to the combustion chamber and a second end opposite to the first end and which can be connected to an outside of the liquid vat, characterised in that the heat exchange portion is located above the second end, and in that at least a part of a bottom portion of the liquid vat extends substantially horizontal and is brought close to a lower surface of the heat exchanging portion of the tail pipe. a housing; a liquid vat capable of storing liquid; and a heating unit configured to heat the liquid stored in the liquid vat, and the heating unit comprises a pulse burner, the pulse burner comprises: a combustion chamber provided in the liquid vat; a tail pipe that is connected to the combustion chamber and has a heat exchanging portion located in the liquid vat and bent in a predetermined shape; and a mixing chamber which communicates with the combustion chamber and to which fuel gas and combustion air is allowed to be supplied, wherein when mixed gas including the fuel gas and the combustion gas is exploded and combusted, the combustion exhaust gas is exhausted through the tail pipe to allow heat exchange with the liquid, and the mixed gas is inhaled from the mixing chamber into the combustion chamber, and wherein at least the heat exchanging portion of the tail pipe is bent on a substantially horizontal plane, and the tail pipe has a first end connected to the combustion chamber and a second end opposite to the first end and which can be connected to an outside of the liquid vat, characterised in that the heat exchange portion is located above the second end, and in that at least a part of a bottom portion of the liquid vat extends substantially horizontal and is brought close to a lower surface of the heat exchanging portion of the tail pipe. a combustion chamber provided in the liquid vat; a tail pipe that is connected to the combustion chamber and has a heat exchanging portion located in the liquid vat and bent in a predetermined shape; and a mixing chamber which communicates with the combustion chamber and to which fuel gas and combustion air is allowed to be supplied, wherein when mixed gas including the fuel gas and the combustion gas is exploded and combusted, the combustion exhaust gas is exhausted through the tail pipe to allow heat exchange with the liquid, and the mixed gas is inhaled from the mixing chamber into the combustion chamber, and wherein at least the heat exchanging portion of the tail pipe is bent on a substantially horizontal plane, and the tail pipe has a first end connected to the combustion chamber and a second end opposite to the first end and which can be connected to an outside of the liquid vat, characterised in that the heat exchange portion is located above the second end, and in that at least a part of a bottom portion of the liquid vat extends substantially horizontal and is brought close to a lower surface of the heat exchanging portion of the tail pipe.