This installment of Weekly Boiler Tips explains how each probe in an array connects to a unique relay, ensuring reliable, indirect boiler level monitoring. Perfect for remote or hard-to-access installations. 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.