Water heating apparatus

1. A water heating apparatus comprising:

a water tank comprising a plurality of sidewalls;

a first heating member mounted inside and across the water tank, the first heating member being in the form of a flat plate comprising opposite first and second surfaces;

at least one second heating member resting on the first heating member and extending between and substantially perpendicular to the first heating member and the sidewalls, forming at least one water compartment with a winding water path; and

at least one third heating member mounted on an inner surface of the top, bottom or sidewalls of the water heating apparatus;

each of the first, second and third heating members comprising:

a heating body made of ceramic glass in the form of a flat plate;

at least a multi-layer conductive coating of nano-thickness deposited on the heating body; and

electrodes coupled to the multi-layer conductive coating.

2. The water heating apparatus as claimed in claim 1 , comprising at least two second heating members provided on the two opposite surfaces of the first heating member, forming two water compartments with two winding water paths respectively.

3. The water heating apparatus as claimed in claim 2 , wherein the two water compartments are in fluid communication with each other by an opening provided on the first heating member, forming a continuing winding water path doubling the length of the water path of a single water compartment.

4. The water heating apparatus as claimed in claim 1 , wherein each of the first, second and third heating members comprises a plurality of conductive coatings electrically connected to one another in series or in parallel.

5. A water heating apparatus comprising:

a water tank comprising a plurality of sidewalls;

a first heating member mounted inside and across the water tank, the heating member being in the form of a flat plate comprising opposite first and second surfaces;

at least one spiral second heating member resting on the first heating member and extending between and substantially perpendicular to the first heating member and the sidewalls, forming at least one water compartment with a spiral water path;

at least one third heating member mounted on an inner surface of the top, bottom or sidewalls of the water heating apparatus;

each of the first, second and third heating members comprising:

a heating body made of ceramic glass;

at least a multi-layer conductive coating of nano-thickness deposited on the heating body; and

electrodes coupled to the multi-layer conductive coating.

6. The water heating apparatus as claimed in claim 5 , further comprising a pipe with one end being connected to an innermost end of the spiral second heating member and in fluid communication with the water compartment by a side opening formed on the pipe, and wherein the pipe defines a water inlet and an outermost end of the spiral second heating member defines a water outlet of the water tank.

7. The water heating apparatus as claimed in claim 5 , comprising two spiral second heating members provided on the two opposite surfaces of the first heating member, forming two water compartments with two spiral water paths respectively.

8. The water heating apparatus as claimed in claim 7 , wherein the two water compartments are in fluid communication with each other by an opening provided on the first heating member, forming a continuing spiral water path doubling the length of water path of a single water compartment.

9. The water heating apparatus as claimed in claim 8 , further comprising a first pipe with one end being connected to an innermost end of one spiral second heating member and in fluid connection communication with one corresponding water compartment through a side opening formed on the first pipe; and a second pipe with one end being connected to an innermost end of the other spiral second heating member and in fluid communication with the other corresponding water compartment through a side opening formed on the second pipe, wherein the first pipe defines a water inlet and the second pipe defines a water outlet of the water tank.

10. The water heating apparatus as claimed in claim 5 , wherein each of the first, second and third heating members comprises a plurality of conductive coatings electrically connected to one another in series or in parallel.

11. The water heating apparatus as claimed in claim 5 , wherein the water tank is generally cylindrical in shape and the first heating member is generally circular in shape.

12. A water heating apparatus comprising:

a water tank comprising a plurality of sidewalls;

a first heating member mounted inside and across the water tank, the first heating member being in the form of a flat plate comprising opposite first and second surfaces;

at least one partition member resting on the first heating member and extending between the first heating member and the sidewalls to form at least one water compartment with a water path;

wherein the first heating member comprises:

a heating body;

at least a multi-layer conductive coating of nano-thickness deposited on the heating body; and

electrodes coupled to the multi-layer conductive coating.

13. The water heating apparatus as claimed in claim 12 , wherein the partition member comprises a second heating member, which comprises: a heating body; at least a multi-layer conductive coating of nano-thickness deposited on the heating body; and electrodes coupled to the multi-layer conductive coating, wherein the multi-layer conductive coating comprises a structure and composition which stabilize performance of the heating member at high temperature.

14. The water heating apparatus as claimed in claim 13 , further comprising at least one third heating member mounted on an inner surface of the sidewalls, wherein the third heating member comprises: a heating body; at least a multi-layer conductive coating of nano-thickness deposited on the heating body; and electrodes coupled to the multi-layer conductive coating, wherein the multi-layer conductive coating comprises a structure and composition which stabilize performance of the heating member at high temperature.

15. The water heating apparatus as claimed in claim 14 , wherein each of the first, second and third heating members comprises a plurality of conductive coatings electrically connected to one another in series or in parallel.

16. The water heating apparatus as claimed in claim 12 , comprising one partition member resting on the first heating member and forming a generally n-shaped water path in the water tank.

17. The water heating apparatus as claimed in claim 12 , comprising a plurality of partition members resting on the first heating member and arranged parallel to one another forming a winding water path in the water tank.

18. The water heating apparatus as claimed in claim 12 , wherein the water tank is generally cylindrical in shape and the first heating member is generally circular in shape.

19. The water heating apparatus as claimed in claim 12 , comprising at least two partition members provided on the two opposite surfaces of the first heating member, forming two water compartments with two water paths respectively.

20. The water heating apparatus as claimed in claim 19 , wherein the two water compartments are in fluid communication with each other by an opening provided on the first heating member, forming a continuing water path doubling the length of the water path of a single water compartment.

21. The water heating apparatus as claimed in claim 12 , wherein the at least one partition member is spiral in shape forming at least one water compartment with a spiral water path.

22. The water heating apparatus as claimed in claim 21 , further comprising a pipe with one end being connected to an innermost end of the spiral partition member and in fluid communication with the water compartment by a side opening formed on the pipe, and wherein the pipe defines a water inlet and an outermost end of the spiral partition member defines a water outlet of the water tank.

23. The water heating apparatus as claimed in claim 21 , comprising two spiral partition members provided on the two opposite surfaces of the heating member, forming two water compartments with two spiral water paths respectively.

24. The water heating apparatus as claimed in claim 23 , wherein the two water compartments are in fluid communication with each other by an opening provided on the heating member, forming a continuing spiral water path doubling the length of the water path of a single.

25. The water heating apparatus as claimed in claim 24 , further comprising a first pipe with one end being connected to an innermost end of one spiral partition member and in fluid communication with its associated compartment by a side opening formed on the first pipe; and a second pipe with one end being connected to an innermost end of the other spiral partition member and in fluid communication with its associated water compartment by means of a side opening formed on the second pipe, wherein the first pipe defines a water inlet and the second pipe defines a water outlet of the water tank.