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A fluid heating apparatus for use in water heaters, boilers, cooking applications or the like comprising a body. The fluid heating apparatus also comprises a primary heat exchanger arranged within the body and a secondary heat exchanger arranged adjacent to the primary heat exchanger within the body

A fluid heating apparatus for use in water heaters, boilers, cooking applications or the like comprising a body. The fluid heating apparatus also comprises a primary heat exchanger arranged within the body and a secondary heat exchanger arranged adjacent to the primary heat exchanger within the body. The apparatus also comprises a burner arranged within the primary heat exchanger. The primary heat exchanger comprises a plurality of concentric doughnut shaped plates arranged over the burner. A blocking plate is arranged adjacent to one of the concentric plates of the primary heat exchanger. The secondary heat exchanger comprises a plurality of concentric doughnut shaped plates arranged adjacent to the blocking plate on a side opposite of the plates of the primary heat exchanger. The apparatus further comprises a manifold in fluid communication with the plurality of concentric plates and blocking plates of both the secondary heat exchanger and primary heat exchanger.

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1. A fluid heating apparatus, said apparatus comprising: a body;a primary heat exchanger arranged within said body;a secondary heat exchanger arranged adjacent to said primary heat exchanger and within said body;a burner arranged within said primary heat exchanger,said primary heat exchanger compris

1. A fluid heating apparatus, said apparatus comprising: a body;a primary heat exchanger arranged within said body;a secondary heat exchanger arranged adjacent to said primary heat exchanger and within said body;a burner arranged within said primary heat exchanger,said primary heat exchanger comprising a plurality of concentric plates arranged over said burner;a thermally conductive hollow blocking plate having complete outer sides without an orifice at a center thereof, said blocking plate arranged adjacent to one of said concentric plates, said blocking plate having a fluid passing through an inside thereof;said secondary heat exchanger comprising a plurality of concentric plates arranged adjacent to said blocking plate; anda manifold in fluid communication with said primary heat exchanger plurality of concentric plates, said secondary heat exchanger plurality of concentric plates and said blocking plate. 2. The apparatus of claim 1 further comprising a blower arranged on one end of said body. 3. The apparatus of claim 1 further comprising an ignition system arranged within said body adjacent to said burner. 4. The apparatus of claim 1 wherein said blocking plate forms a barrier between said primary heat exchanger and said secondary heat exchanger. 5. The apparatus of claim 1 further comprising an orifice in an end opposite said blower, said orifice for exhausting gasses from said body. 6. The apparatus of claim 1 wherein said body having a generally cylindrical shape. 7. The apparatus of claim 1 wherein said blocking plate generally having a disc shape, said blocking plate having at least one baffle arranged therein. 8. The apparatus of claim 1 wherein said primary heat exchanger concentric plates and said secondary heat exchanger concentric plates having a generally hollow doughnut shape, said primary heat exchanger concentric plates and said secondary heat exchanger concentric plates having a wall arranged therein. 9. The apparatus of claim 7 wherein said baffles create a fluid path through said blocking plate interior between a first orifice and a second orifice. 10. The apparatus of claim 8 wherein a fluid flows between a first orifice and a second orifice of said primary heat exchanger concentric plate and between a first orifice and a second orifice of said secondary heat exchanger concentric plate, said wall is arranged adjacent to and in between said first and second orifice, said primary heat exchanger plurality of concentric plates and said secondary heat exchanger plurality of concentric plates create a large cross sectional flow passage area to reduce a pressure drop across said primary and secondary heat exchangers. 11. The apparatus of claim 1 wherein said manifold having an inlet and outlet manifold. 12. The apparatus of claim 1 wherein said primary heat exchanger concentric plates, said secondary heat exchanger concentric plates and said blocking plate are arranged parallel to one another with a predetermined gap between each of said primary heat exchanger concentric plates, said secondary heat exchanger concentric plates and said blocking plates. 13. The apparatus of claim 1 wherein each individual concentric plate of said primary heat exchanger plurality of concentric plates and said secondary heat exchanger plurality of concentric plates having an inlet tube extending therefrom and into said manifold and an outlet tube extending therefrom and into said manifold. 14. The apparatus of claim 11 wherein a cold fluid enters a first section of said inlet manifold then travels through said primary heat exchanger into said outlet manifold, said fluid then travels through another portion of said primary heat exchanger and said secondary heat exchanger into a second section of said inlet manifold as a hot fluid. 15. A fluid heating apparatus, said apparatus comprising: a body;a primary heat exchanger arranged within said body;a secondary heat exchanger arranged adjacent to said primary heat exchanger and within said body;a burner arranged within said primary heat exchanger;said primary heat exchanger comprising a plurality of concentric plates arranged over said burner, said burner is inside a hollow portion of all of said plurality of concentric plates of said primary heat exchanger,a thermally conductive blocking plate having a hollow disc shape without an orifice at a center thereof arranged adjacent to one of said concentric plates, said blocking plate having a fluid passing through an inside thereof;said secondary heat exchanger comprising a plurality of concentric plates arranged adjacent to said blocking plate;a manifold in fluid communication with said primary heat exchanger and secondary heat exchanger plurality of concentric plates and said blocking plate; andsaid burner having a plurality of smaller flames arranged over an outer surface thereof which reduces adiabatic flame temperature and emission of oxides of nitrogen, said plurality of smaller flames heats said outer surface of said burner to increase radiation heat transfer from said outer surface of said burner to said primary heat exchanger plurality of concentric plates, said burner and said primary heat exchanger plurality of concentric plates having a gap therebetween, said gap is sized such that said plurality of smaller flames do not impinge on an inner circumference of said primary heat exchanger plurality of concentric plates. 16. A high efficiency low pollutant fluid heating apparatus, said apparatus comprising: a body;a first set of hollow ring shaped plates arranged within said body and adjacent to a first end of said body;a thermally conductive blocking plate having a hollow disc shape without an orifice at a center thereof arranged adjacent to said first set of plates, said blocking plate having a fluid passing through an inside thereof;a second set of hollow ring shaped plates arranged adjacent to said blocking plate;a first manifold in fluid communication with said first set and second set of hollow ring shaped plates and said blocking plate;a second manifold in fluid communication with said first set and second set of hollow ring shaped plates and said blocking plate;a burner arranged within said body and within said first set of ring shaped plates;a blower connected to said body and adjacent to said burner; andsaid first manifold and said second manifold connected to said first set of said plates, said second set of said plates and said blocking plate. 17. The apparatus of claim 16 wherein said burner is high efficiency and is ignited by an ignition system arranged in said body. 18. The apparatus of claim 16 wherein said first manifold having an inlet port and an outlet port, said first manifold having a first section and a second section. 19. The apparatus of claim 16 wherein said first set and second set of hollow ring shaped plates and said blocking plate are arranged concentric and parallel to each other with a predetermined size gap between each of said first set and second set of hollow ring shaped plates and said blocking plate.