O.K., you've got me. Yes, I could use my coal forge, but I don't want to. Yes, I could use my two-burner gas forge, but I don't want to. Or, I could use a three-burner gas forge. Why? Seems like when I watch knife and sword makers, they are being made on three-burner forges. Wasting heat? I can turn off one or two of the burners - making big into small. But, I can't make small into big. I'll ask again. Recommendations on three-burner forges?