Gas burner

1. A multi-ring gas burner, comprising:

an inner burner;

an outer burner ring extending around the inner burner, the outer burner ring including a burner base, a burner head and a cap, the burner head positioned on the burner base such that the burner base and the burner head define a fuel chamber of the outer burner ring between the burner base and the burner head, a plurality of flame ports formed on the burner head, the plurality of flame ports extending from the fuel chamber of the outer burner ring to an outer portion of the outer burner ring, the cap positioned on the burner head such that the burner head and the cap defining a plurality of secondary air channels between the burner head and the cap, an exit of each secondary air channel of the plurality of secondary air channels positioned proximate the outer portion of the outer burner ring, air within the plurality of secondary air channels assisting with cooling the burner head, the cap, or both the burner head and the cap,

wherein the burner head is positioned on the burner base such that the burner base and the burner head also define a plurality of retention ports between the burner base and the burner head, the plurality of retention ports positioned adjacent a bottom of the plurality of flame ports or below the plurality of flame ports.

2. The multi-ring gas burner of claim 1 , wherein each retention port of the plurality of retention ports is positioned between a respective pair of adjacent retention ports of the plurality of flame ports.

3. The multi-ring gas burner of claim 1 , wherein an entrance of each secondary air channel of the plurality of secondary air channels is positioned proximate an inner portion of the outer burner ring.

4. The multi-ring gas burner of claim 3 , wherein the burner base defines an opening at the inner portion of the outer burner ring, the opening of the burner base positioned proximate the entrance of each secondary air channel of the plurality of secondary air channels, the opening configured for directing air from below the burner base to the plurality of secondary air channels.

5. The multi-ring gas burner of claim 1 , wherein the cap has a ledge that extends over the plurality of flame ports.

6. The multi-ring gas burner of claim 5 , wherein the plurality of flame ports are at least partially formed on an outer surface of the burner head, the outer surface of the burner head facing an inner surface of the ledge of the cap, the outer surface of the burner head inclined such that the outer surface of the burner head is substantially parallel to the inner surface of the ledge of the cap.

7. The multi-ring gas burner of claim 6 , wherein the secondary air channels of the plurality of secondary air channels slope upwardly from an inner portion of the outer burner ring to the outer portion of the outer burner ring.

8. The multi-ring gas burner of claim 1 , wherein the burner base and burner head are formed of cast metal and the cap is formed of stamped metal.

9. The multi-ring gas burner of claim 8 , wherein the burner base and burner head are formed of cast aluminum alloy and the cap is formed of stamped steel.

10. A gas burner, comprising:

a burner base;

an annular burner head positioned on the burner base such that the burner base and the burner head define a fuel chamber, a plurality of flame ports formed on the burner head, the plurality of flame ports configured for direction gaseous fuel out the fuel chamber; and

an annular cap positioned on the burner head such that the burner head and the cap defining a plurality of secondary air channels between the burner head and the cap, the plurality of secondary air channels positioned above the plurality of flame ports, an exit of each secondary air channel of the plurality of secondary air channels positioned proximate a respective flame port of the plurality of flame ports, air within the plurality of secondary air channels assisting with cooling the burner head, the cap, or both the burner head and the cap,

wherein the burner head is positioned on the burner base such that the burner base and the burner head also define a plurality of retention ports between the burner base and the burner head, the plurality of retention ports positioned adjacent a bottom of the plurality of flame ports or below the plurality of flame ports.

11. The gas burner of claim 10 , wherein each retention port of the plurality of retention ports is positioned between a respective pair of adjacent retention ports of the plurality of flame ports.

12. The gas burner of claim 10 , wherein an entrance of each secondary air channel of the plurality of secondary air channels is positioned proximate an inner portion of the burner head.

13. The gas burner of claim 12 , wherein the burner base defines an opening proximate the inner portion of the burner head, the opening of the burner base positioned proximate the entrance of each secondary air channel of the plurality of secondary air channels, the opening configured for directing air from below the burner base to the plurality of secondary air channels.

14. The gas burner of claim 10 , wherein the cap has a ledge that extends over the plurality of flame ports.

15. The gas burner of claim 14 , wherein the plurality of flame ports are at least partially formed on an outer surface of the burner head, the outer surface of the burner head facing an inner surface of the ledge of the cap, the outer surface of the burner head inclined such that the outer surface of the burner head is substantially parallel to the inner surface of the ledge of the cap.

16. The gas burner of claim 15 , wherein the secondary air channels of the plurality of secondary air channels slope upwardly from an inner portion of the burner head ring to an outer portion of the burner head.

17. The gas burner of claim 10 , wherein the burner base and burner head are formed of cast metal and the cap is formed of stamped metal.

18. The gas burner of claim 17 , wherein the burner base and burner head are formed of cast aluminum alloy and the cap is formed of stamped steel.