The present invention relates to a late-night electric hot water boiler, to simplify the pressure-resistant structure to reduce the weight and at the same time to manufacture at a low cost, to occupy a small installation place.;The present invention is formed by welding the upper cylinder (2), the central cylinder (3) and the lower cylinder (4) formed in a cylindrical shape in the upper and lower communication with each other, the upper and lower cylinders (2) The stay 5, 5 'is provided between the engaging part of the 4 and the central cylinder 3, and the upper and lower cylinders and the central cylinder are installed while the heater 6 is installed in the lower cylinder 4. The spherical covers 7 and 7 'are welded together before and after (2) (4) (3).
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