A gas burner assembly for heating a subsurface formation includes {HEAD ~ an oxidant conduit}, a fuel conduit, and a plurality of oxidizers coupled to {TAIL ~ the oxidant conduit} 
A gas burner assembly for heating a subsurface formation includes { HEAD ~ an oxidant conduit } , a fuel conduit , and a plurality of oxidizers coupled to { TAIL ~ the oxidant conduit }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL