The water heater of the present invention is a water heater that heats water using at least one of an electric heater or a hybrid heat pump, and communicates with a water inlet pipe for supplying water to the inside, and a heater for heating the supplied water is provided, A water tank communicating with an outlet pipe for discharging water heated to a set temperature, a heat insulating structure provided between the outside of the water tank and an outside of the water heater, and an outside of the water heater are formed, and the outside of the water tank or the heat insulating structure An external structure provided to physically protect an internal element located in the , wherein the external structure is a first external panel fastened to one side of the water heater, at a position opposite to any one surface of the first external panel a second outer panel fastened to at least another side of the water heater, and a cover panel fastened between the first outer panel and the second outer panel, and detachable from the water heater to allow access to the inner element , it reliably protects internal elements, prevents careless access by users, improves convenience in maintenance through easy attachment and detachment, and provides excellent aesthetic functions while forming the exterior of the water heater.
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