The Bosch HVAC 63002401 Burner Thermal Door Insulation is an OEM heat-insulating component designed for the burner door of select Buderus G-series cast-iron oil boilers. It works by providing a high-temperature insulating barrier that helps contain combustion heat within the boiler and reduces heat transfer to surrounding components. This insulation is used with compatible Buderus hea... https://www.partshnc.com/bosch-hvac-63002401-burner-thermal-door-insulation