The Weil McLain 512-050-230 Thermo-Fuse Rollout 228°C/442°F is a critical safety component designed for Weil McLain boilers and heating systems. It monitors heat levels around the burner area and automatically shuts down the system if excessive temperatures are detected, preventing potential overheating or fire hazards. https://www.partshnc.com/thermofuse-rollout-228c442f-for-weil-mclain-part-512-050-230