Hot water storage tank unit and water heater provided with the same

摘要

A hot water storage tank 4 having a hemispherical upper plate 19, a cylindrical body plate 20 joined to the upper plate 19, a hemispherical lower plate 21 joined to the body plate 20, and storing hot water; And a vacuum heat insulating material 25 disposed around the part plate 20, and a reinforcing part 20 a formed in a convex shape toward the inner side of the hot water storage tank 4 is provided on the outer periphery of the body part plate 20. Therefore, the deformation of the hot water storage tank 4 can be reduced, and the reinforcing part 20a is formed in a convex shape on the inner side of the hot water storage tank 4, so that the assembly of the hot water storage tank 4 and the heat insulating material 5 is improved. And the heat insulation of the hot water storage tank 4 improves.