Heater with high sealing performance

The utility model relates to the technical field of heaters, in particular to a high-sealing-performance heater which comprises a combustion chamber assembly, a heat exchange body assembly and a motor assembly, the heat exchange body assembly comprises a water jacket body inner sleeve, a water jacket body outer sleeve and a water inlet and outlet elbow connector, and the water jacket body inner sleeve is inserted into the water jacket body outer sleeve. A heat exchange cavity for containing heat exchange liquid is formed between the water jacket body inner sleeve and the water jacket body outer sleeve, the water inlet and outlet elbow connector is communicated with the interior of the heat exchange cavity, an inner cavity for containing a combustion chamber assembly is formed in the water jacket body inner sleeve, and a fixing base connected with a motor assembly is arranged at the bottom of the water jacket body inner sleeve. The water jacket body has the advantages that the water jacket body outer sleeve an