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A heat exchanger having a cylindrical body comprising an upper section, a lower section, a side water jacket surrounding the upper and lower sections, a top water jacket disposed atop the upper section and a gas exhaust disposed below the lower section. A water cavity is disposed substantially in th

A heat exchanger having a cylindrical body comprising an upper section, a lower section, a side water jacket surrounding the upper and lower sections, a top water jacket disposed atop the upper section and a gas exhaust disposed below the lower section. A water cavity is disposed substantially in the lower section while a gas cavity having a burner is disposed substantially centrally within the gas cavity. A plurality of water tubes disposed in a ring formation, connect the water cavity through the gas cavity to the top water jacket and a plurality of gas tubes also disposed in ring formations, connect the gas cavity through the water cavity to the gas exhaust. At least one of the gas tubes ring has a diameter that is greater than that of the water tubes ring.

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1. A heat exchanger (2) comprising: (a) a liquid cavity (68) having a liquid inlet (22) for receiving a liquid flow (14);(b) a gas cavity (66) configured for receiving a burner (8) substantially centrally disposed within said gas cavity (66), said gas cavity (66) is configured to be isolated from sa

1. A heat exchanger (2) comprising: (a) a liquid cavity (68) having a liquid inlet (22) for receiving a liquid flow (14);(b) a gas cavity (66) configured for receiving a burner (8) substantially centrally disposed within said gas cavity (66), said gas cavity (66) is configured to be isolated from said liquid cavity (68) with a flat sheet (48), wherein said gas cavity (66) is disposed atop said liquid cavity (68);(c) a plurality of liquid tubes (18) connecting said liquid cavity (68) through said gas cavity (66); and(d) a plurality of gas tubes (20) connecting said gas cavity (66) through said liquid cavity (68) to a gas exhaust (26) disposed below said liquid cavity (68), said gas exhaust (26) is configured to be isolated from said liquid cavity (68) with a flat sheet (50), wherein said liquid flow (14) is configured to flow from said liquid inlet (22) through said liquid cavity (68), said plurality of liquid tubes (18) to a liquid outlet (24) and said burner (8) is configured to produce direct heat and a flue gas flow (12) configured to flow from said gas cavity (66) through said plurality of gas tubes (20) to said gas exhaust (26) and heat transfer is caused from said direct heat and said flue gas flow (12) to said liquid flow (14). 2. The heat exchanger (2) of claim 1, further comprising a top liquid jacket (6) disposed atop said gas cavity (66), said gas cavity 66 is configured to be isolated from said too liquid jacket (6) with a flat sheet (46), wherein said top liquid jacket (6) connects said liquid flow (14) from said plurality of liquid tubes (18) to said liquid outlet (24). 3. The heat exchanger (2) of claim 2, further comprising a side liquid jacket (4) disposed around at least a portion of said gas cavity (66), wherein said side liquid jacket (4) connects said liquid flow (14) from said top liquid jacket (6) to said liquid outlet (24). 4. The heat exchanger (2) of claim 3, wherein said side liquid jacket (4) is comprised of at least one outer tube (82). 5. The heat exchanger (2) of claim 1, further comprising a side liquid jacket (4) disposed around at least a portion of said gas cavity (66) and at least a portion of said liquid cavity (68), wherein said side liquid jacket (4) connects said liquid flow (14) from said top liquid jacket (6) to said liquid outlet (24). 6. The heat exchanger (2) of claim 5, wherein said side liquid jacket (4) is comprised of at least one outer tube (82). 7. The heat exchanger (2) of claim 1, further comprising at least one turbulator (16) disposed within one of said plurality of liquid tubes (18) and said plurality of gas tubes (20). 8. The heat exchanger (2) of claim 1, wherein said plurality of gas tubes (20) is disposed at a greater radial distance from said burner (8) than the radial distance between said plurality of liquid tubes (18) and said burner (8). 9. The heat exchanger (2) of claim 8, wherein said plurality of gas tubes (20) is configured to extend into said gas cavity (66), said plurality of gas tubes (20) further comprises at least one slot (74) facing away from said burner (8). 10. The heat exchanger (2) of claim 1, wherein said plurality of liquid tubes (18) is configured to penetrate said gas cavity (66) more than once to increase exposure of said liquid flow (14) to said heat transfer. 11. The heat exchanger (2) of claim 1, wherein at least one of said plurality of liquid tubes (18) and said plurality of gas tubes (20) is a twisted tube. 12. A heat exchanger (2) comprising: (a) a liquid cavity (68) having a liquid inlet (22) for receiving a liquid flow (14);(b) a gas cavity (66) configured for receiving a burner (8) substantially centrally disposed within said gas cavity (66), said gas cavity (66) is configured to be isolated from said liquid cavity (68) with a flat sheet (48), wherein said gas cavity (66) is disposed atop said liquid cavity (68);(c) a top liquid jacket (6) disposed atop said gas cavity (66);(d) a plurality of liquid tubes (18) connecting said liquid cavity (68) through said gas cavity (66) to said top liquid jacket (6);(e) a plurality of gas tubes (20) connecting said gas cavity (66) through said liquid cavity (68) to a gas exhaust (26) disposed below said liquid cavity (68), said gas exhaust (26) is configured to be isolated from said liquid cavity (68) with a flat sheet (50); and(f) a side liquid jacket (4) disposed around at least a portion of said gas cavity (66) and at least a portion of said liquid cavity (68), wherein said liquid flow (14) is configured to flow from said liquid inlet (22) through said liquid cavity (68), said plurality of liquid tubes (18), said top liquid jacket (6), said side liquid jacket (4) to a liquid outlet (24), said liquid flow is confined within a space delineated within said top liquid jacket (6) and said side liquid jacket (4) and said burner (8) is configured to produce direct heat and a flue gas flow (12) configured to flow from said gas cavity (66) through said plurality of gas tubes (20) to said gas exhaust (26) and heat transfer is caused from said direct heat and said flue gas flow (12) to said liquid flow (14). 13. The heat exchanger (2) of claim 12, wherein said side liquid jacket (4) is comprised of at least one outer tube (82). 14. The heat exchanger (2) of claim 12, further comprising at least one turbulator (16) disposed within one of said plurality of liquid tubes (18) and said plurality of gas tubes (20). 15. The heat exchanger (2) of claim 12, wherein said plurality of gas tubes (20) is disposed at a greater radial distance from said burner (8) than the radial distance between said plurality of liquid tubes (18) and said burner (8). 16. The heat exchanger (2) of claim 15, wherein said plurality of gas tubes (20) is configured to extend into said gas cavity (66), said plurality of gas tubes (20) further comprises at least one slot (74) facing away from said burner (8). 17. The heat exchanger (2) of claim 12, wherein said plurality of liquid tubes (18) is configured to penetrate said gas cavity (66) more than once to increase exposure of said liquid flow (14) to said heat transfer. 18. The heat exchanger (2) of claim 12, wherein at least one of said plurality of liquid tubes (18) and said plurality of gas tubes (20) is a twisted tube. 19. A heat exchanger (2) comprising: (a) a liquid cavity (68) having a liquid inlet (22) for receiving a liquid flow (14);(b) a gas cavity (66) configured for receiving a burner (8) substantially centrally disposed within said gas cavity (66), said gas cavity (66) is configured to be isolated from said liquid cavity (68) with a flat sheet (48), wherein said gas cavity (66) is disposed atop said liquid cavity (68);(c) a side liquid jacket (4) disposed around at least a portion of said gas cavity (66);(d) a top liquid jacket (6) disposed atop said gas cavity (66);(e) a plurality of liquid tubes (18) connecting said side liquid jacket (4) through said gas cavity (66) to said top liquid jacket (6), wherein said plurality of liquid tubes (18) is configured to penetrate said gas cavity (66) more than once to increase exposure of said liquid flow (14) to said heat transfer; and(f) a plurality of gas tubes (20) connecting said gas cavity (66) through said liquid cavity (68) to a gas exhaust (26) disposed below said liquid cavity (68), said gas exhaust (26) is configured to be isolated from said liquid cavity (68) with a flat sheet (50), wherein said liquid flow (14) is configured to flow from said liquid cavity (68) through said side liquid jacket (4), said plurality of liquid tubes (18), said top liquid jacket (6) and a liquid outlet (24) disposed in said top liquid jacket (61), said liquid flow is confined within a space delineated within said top liquid jacket (6) and said side liquid jacket (4) and said burner (8) is configured to produce direct heat and a flue gas flow (12) configured to flow from said gas cavity (66) through said plurality of gas tubes (20) to said gas exhaust (26) and heat transfer is caused from said direct heat and said flue gas flow (12) to said liquid flow (14).