Abstract: A machine for drinking water adapted to instantly heat/cool the water for drinking, it includes: a main body provided with an operation panel and a water providing outlet, a water storage barrel, a pump for drawing the water, and a heating unit and/or a cooling unit, a user can thus operates the operation panel to render the water for drinking to be instantly heated or cooled and to flow out of the water providing outlet for being drunk instantly, the machine for drinking water of the present invention does not need to be provided with a heat preservation tank or a coolness preservation tank, but the user can get hot water or ice water instantly, this can largely reduce exhausted electric quantity and occupied space.

Abstract: A heating device for an electric water heater, especially a heating device that can effectively recover waste heat, the device includes a secondary water box provided on one of the top and the bottom sides of a flat type main water box, the secondary water box is communicated with the main water box to guide water of the secondary water box into the main water box; the main and the secondary water boxes are provided therebetween with a laminate electric heating board of which the top and the bottom sides are clung respectively to the secondary water box and the main water box, an effect of preheating the water in the secondary water box is obtained to thereby effectively use the waste heat for saving energy source, and heating efficiency can be increased.