Abstract: A water-heater casing has a barrel, two covers and a chamber. The barrel has a cylindrical body and at least one hump and two open ends. The at least one hump is formed from the cylindrical body and has at least one tangential side. The covers are respectively mounted on the open ends of the barrel. The chamber is formed between the cylindrical body, hump and covers and corresponds to a water tank and components. The water-heater casing saves space and is attractive.

Abstract: An electric water heater includes a container, a cold water inlet pipe, a hot water outlet pipe, and a separation board. The separation board includes a first vertical plate having a first end connected to an upper portion of the container, a separation plate having a first end connected to a second end of the first vertical plate, and a second vertical plate having a first end connected to a second end of the separation plate and a second end connected to a lower portion of the container. Thus, the separation board divides the inside of the container into a heat storage space and an instantaneously heating space, so that the hot water from the hot water outlet pipe is kept at a preset temperature.

Abstract: An electric water heater has a base, a tank mounted on the base, a partition wall mounted in the tank to divide the tank into a heating chamber and a reservoir and at least one electric heating element extending into the heating chamber. A cool-water supply pipe extends into the heating chamber to supply cool water to the tank when a user uses the hot water stored in the reservoir, This can immediately provide unlimitedly hot water at a desired high temperature to a user. In addition, the space for locating the tank can also be reduced. The convenience of using and locating the water heater can be improved.

Abstract: An electric safeguard door lock includes a lock base having an elongated plate containing an opening, two side plates each attached to the elongated plate and each containing an arcuate slot, a lock bolt pivotally mounted on a first pivot axle and having a first end detachably extending through the opening and a second end containing a slide slot, a push rod slidably received in the slide slot and having two ends each slidably received in the arcuate slot, at least one pawl member pivotally mounted on a second pivot axle and having a first end formed with a first arm containing a notch detachably receiving the push rod, and a second end formed with a second arm containing an abutting recess, a wheel including a worm gear mounted thereon, an actuating member secured on the wheel to rotate therewith and including two drive stubs each detachably abutting the abutting recess, a speed reduction motor mounted in the assembly space, and a worm mounted on the speed reduction motor and meshing with the worm gear.