I purchased my first Weber gas grill and assembled it easily and I am **. I proceeded t...

I purchased my first Weber gas grill and assembled it easily and I am **. I proceeded to do the initial burn. I turn all ***** to highest setting, ignited them, closed the lid and left for ** mins or so when I returned the thermometer read just about *** degrees! No smoke or burnt smell associated with factory oils or residue. I proceeded to wire brush the grill grates as instucted and wiped the grates with a clean cotton towel. I began cooking some burgers and noticed the temperature drop a bit. I left the rill for about * mins only to return to barely sizzling burgers. I cannot get the temp above *** degrees. As a point of reference, I had just replaced my Charbroil * burner with the Weber and I never experienced any issue with the Charbroil coming up to high heat. I could reach temps as high as *** degrees with no trouble. Question is, is the grill or am I doing something wrong?