I had a couple little leaking problems myself to fix from casting defects (JB Weld took care of that).......but for the price, the heat I'm throwing and the fact that I can tap right into my natural gas line.....I wouldn't do it any other way. (except maybe electric) I use a burner for the BK and the HLT, but not the mash tun. I just insulated it and lose only about 1 degree F per hour. It's not the prettiest mash tun in the world, but she does the job.
I use heat sheilds to block the heat from things that need protected. I have heat shields on the burner stands themselves to contain most of the heat and channel it upward towards my kettles and I have some others cut up for added protection side to side and for the ball valves/thermometers.
As for lighting the burners....I use a grill lighter. Just light the grill lighter first and then crack the ball valve a little......wave the lighter around until you get the majority of the nozzles lit and then flame on.
