Took a personal day off work yesterday to brew a ESB. All was going great mashed in hit my target gravity and I was rocking along. Got to my first hop addition' good rolling boil and then disaster struck tiny sparks started spitting out my burner like a fourth of July sparkler on a atomic level. . There was flames and sparks blasting three hundred 360 degrees beneath my kettle popping like fire crackers, sparks flying everywhere. I jumped up out of my lawn chair debating either run for cover or get it shut down of course I choose to shut it down. I edge my way closer the sparks blasting at me I quickly grabed the lid to my kettle and like captain America I used it as a shield blocking the sparks from getting me. I made my way to the tank and got it shut down. Then like a fireworks show the final boom and the burner was done. Turned out the burner had a crack through the middle and the cast iron was crumbling into the flames causing the sparkler effect. Damn what a day!!!!