The Burnham Boiler109645-01 12" Temperature Sensor Probe is a replacement sensing component designed to monitor temperature within compatible Burnham boiler systems. The probe detects changes in water or system temperature and sends readings to the boiler’s control system, helping regulate heating operation accurately. It is commonly used in Burnham hydronic heating boilers and relate... https://www.partshnc.com/109645-01-burnham-boiler-limit-sensor