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.