Water heater with novel combustion structure

The utility model discloses a water heater with a novel combustion structure. The water heater comprises a combustor, a water tank, a heat exchanger, a heat exchange water pipe and a combustion chamber, a first combustion cavity is formed in the upper end of the combustion chamber; a second combustion cavity is formed in the lower end of the water tank; a plurality of secondary air supply outlets are formed in the first combustion cavity; the water tank is made of copper or copper alloy. According to the combustion structure, the combustion cavity, arranged in the water tank, of an existing traditional combustion structure is divided into the first combustion cavity and the second combustion cavity, so that the height span of the water tank can be greatly reduced, and the weight and the cost of the whole combustion structure are reduced; in addition, a secondary air supply opening formed in the first combustion chamber supplies secondary air for combustion of fuel in the first combustion chamber, the secondar