Patent ID: 6612268
Filing Date: 2003-09-02
Classification: F24H

Abstract:
A hot-water appliance capable of resisting pressure in the public water supply system, comprising at least one hot-water vessel (1) with a supply conduit (3) connectable to the public water supply system and a discharge conduit (4) connectable to a draw-off tap, wherein said one hot-water vessel (1) further comprises a heating element (5) contained in the hot-water vessel (1) and a temperature regulation (25), a substantially cylindrical jacket wall (1a, 9) and two end walls (1b, 8), with said one hot-water vessel (1) having a maximum capacity of 20 liters for heating water characterized in that a vacuum insulated jacket (2) surrounds at least the cylindrical wall part (1a, 9) of the hot water vessel, with said vacuum insulated jacket consisting of wall(s) composed of a solid non-plastic material composition and a thickness of less than ca. 2 cm, the wall(s) enclosing a hollow vacuum space whereupon at a temperature difference between the hot water vessel and the ambient atmosphere of at least 90Â° C. the vacuum insulated jacket will retain an internal absolute pressure in the vacuum space of less than 10âˆ’2 millibar, corresponding to a vacuum of less than 0.0075 torr, such that the heat loss per unit area of surface area to be insulated is not more than 200 watts per square meter.