A burner assembly , comprising: a body that defines a first cavity , wherein the body comprises: an upstream end ; and a downstream end ; a burner coupled to the body that is configured to combust an air/fuel mixture, wherein the burner has a central axis, wherein the first cavity extends from the upstream end , and the burner extends from the first cavity to the downstream end , and wherein the burner comprises: a combustion chamber ; a first sub-burner comprising a plurality of axially extending first bores , wherein the first sub-burner is configured to communicate the air/fuel mixture from the first cavity into the combustion chamber through the plurality of axially extending first bores at a first flowrate; and a second sub-burner comprising a plurality of radially extending second bores , wherein the second sub-burner is configured to communicate the air/fuel mixture from the first cavity into the combustion chamber through the plurality of radially extending second bores at a second flowrate; a burner bore extending through the body from the downstream end to the first cavity ; and an insert disposed within the burner bore , wherein the insert comprises each of the plurality of first bores and the plurality of second bores ; wherein the second flowrate is lower than the first flowrate; and an igniter configured to ignite the air/fuel mixture. a body that defines a first cavity , wherein the body comprises: an upstream end ; and a downstream end ; an upstream end ; and a downstream end ; a burner coupled to the body that is configured to combust an air/fuel mixture, wherein the burner has a central axis, wherein the first cavity extends from the upstream end , and the burner extends from the first cavity to the downstream end , and wherein the burner comprises: a combustion chamber ; a first sub-burner comprising a plurality of axially extending first bores , wherein the first sub-burner is configured to communicate the air/fuel mixture from the first cavity into the combustion chamber through the plurality of axially extending first bores at a first flowrate; and a second sub-burner comprising a plurality of radially extending second bores , wherein the second sub-burner is configured to communicate the air/fuel mixture from the first cavity into the combustion chamber through the plurality of radially extending second bores at a second flowrate; a burner bore extending through the body from the downstream end to the first cavity ; and an insert disposed within the burner bore , wherein the insert comprises each of the plurality of first bores and the plurality of second bores ; wherein the second flowrate is lower than the first flowrate; and a combustion chamber ; a first sub-burner comprising a plurality of axially extending first bores , wherein the first sub-burner is configured to communicate the air/fuel mixture from the first cavity into the combustion chamber through the plurality of axially extending first bores at a first flowrate; and a second sub-burner comprising a plurality of radially extending second bores , wherein the second sub-burner is configured to communicate the air/fuel mixture from the first cavity into the combustion chamber through the plurality of radially extending second bores at a second flowrate; a burner bore extending through the body from the downstream end to the first cavity ; and an insert disposed within the burner bore , wherein the insert comprises each of the plurality of first bores and the plurality of second bores ; wherein the second flowrate is lower than the first flowrate; and an igniter configured to ignite the air/fuel mixture. <EOS>