Patent ID: 8269153

Claim:
A water boiler comprising, in combination: a water storage tank including a heating room, an outer water storage room, and an inner water storage room located between the heating room and the outer water storage room in a radial direction, with the inner and outer water storage rooms being outside of the heating room in the radial direction, with the outer water storage room being adapted for containing water received from a water inlet pipe, with the inner water storage room communicating with the outer water storage room and the heating room, wherein the water in the outer water storage room flows into the inner water storage room and the heating room for storage; a heater including an induction coil located outside of the water storage tank; and a heat pipe unit including at least one heat-transfer pipe, with the heat-transfer pipe including an upper segment and a lower segment spaced from the upper segment in a vertical direction perpendicular to the radial direction, with the upper segment of the heat-transfer pipe located in the heating room of the water storage tank, with the lower segment of the heat-transfer pipe located outside of the heating room and in the induction coil of the heater, with the at least one heat-transfer pipe being heated to heat the water in the heating room when the induction coil turns ON.