Yes, you can have a "Bang" with the BB if not careful. Because of the three large burners, a lot of butane can get trapped in the firebox and boiler flues if you do not lite them fast after you turn on the gas. To avoid this, make sure that when you lite your BB up that you have about an 1.5" to 2" of the burner out the back of the firebox. Lite quickly, then slide burners all the way in. The most important thing is to leave the front of the smoke box door closed but not latched. This works as a safety precaution. If you do get a lot of trapped butane and it flashes the smoke box door will pop open from the blast relieving the pressure. The smoke box door snaps shut tight enough that I leave mine unlatched all the time anyway. You want to use a Aster suction fan when liteing. Even though you are running on butane, the boiler is so long that the suction fan helps draw the heat down the boiler flues until you have enough pressure to turn on the blower. Because of the two smoke stacks, the fan goes in the first and I cover the second with a quarter. Good luck. We are lucky that in our steam group we have two BB's to run and have fun with.