Burner

Abstract

A gas burner for a gas fired heating appliance, such as a water heater. The gas burner is located within a combustion chamber and includes an inlet conduit through which combustible gas and primary air are received. An air scoop shrouds the inlet conduit and at least partially defines a flow path of primary air, substantially isolated from the combustion chamber and which extends from the inlet end of the inlet conduit to a primary air port that communicates with a source of primary air located outside the combustion chamber. The combustion chamber also includes at least one port through which secondary combustion air is admitted into the combustion chamber. A flow path transition member is located within the combustion chamber and is in fluid communication with the primary air port. The transition member also forms part of the isolated primary air flow path and sealingly engages the air scoop when the burner is installed into the combustion chamber. The transition member is provided with at least one flange that is engaged by a complementally shaped lip defined by the air scoop, as the burner is moved into its operative position through an access opening. A door or bulkhead closes off the opening through which the burner is installed and the door is adapted to mount a gas orifice through which combustible gas is discharged into the air scoop. The transition member is mounted to a base plate of the water heater and overlies a port communicating with a region below the water heater which serves as the source of primary air. The air scoop is mounted to the bulkhead/access door in a region having a predetermined profile that is unrelated to the radius of the access opening.