Welcome to part 2 of our guide to understanding ultraviolet scanners for boilers. This week we explore the differences between manual and self-checking scanners, focusing on how they work as well as the efficiency and reliability. 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.