Don’t let thermal shock sneak up on you! Today on Weekly Boiler Tips learn everything you need to know about low fire hold devices: what triggers the hold (temp vs. pressure), wiring diagram cues, how to look for the oil-can symbol or squiggly line, how to “walk up” your firing rate safely after warm-up, and more. Safety notice: Always consult experts for complex repairs. Weekly Boiler Tips are compiled by the knowledgeable and remarkably prolific content creators at WARE, a family owned, third-generation, 69-year-old commercial and industrial boiler rental and service firm based in Louisville KY. You can learn all about this and more at WARE’s Boiler University.