I came across this interesting video on youtube. He uses a glumpy style burner with a siphon nozzle. I think that this burner has a bright future, it is very similar to the burner that Clarke (porositymaster) is using and his works really well for melting cast iron. The person who made this video is a great fan of glumpys youtube channel. He does mention that his burners cost $500 each so I pass on buying one and have go at making my own.