I am smelting on a fish cooker that was given to me for this purpose and I do not get a good blue flame but get a lot of yellow instead. I suspect that the previous owner left the cooker outside and that rust has caused the holes in the burner to get enlarged. I am thinking that a new burner will be the answer to my flame issues. I looked at burners and some make a lot more BTUs than others and some are high pressure and others are low pressure. What in your experience is best for me in my smelting process, and why??? Thanks