1. 3-20-00844 thermistor probe is made of stainless steel, high temperature resistance, the wire contains high quality copper core with excellent performance, reliable and durable and has long service life 2.WIDE COMPATIBILITY: 3-20-00844 thermistor probe fit for Harman Pellet Accentra 52i, Accentra 52i-TC, Accentra Cast FS, Accentra Insert, Absolute 43, Absolute 63, Advance, Allure 50, HydroFlex 60 (HF60) Boiler, P35i, P38, P43, P61, P61A, P68, PB105 Boiler, PC45, PF100 Furnace, PF120 Furnace, XXV (25th Anniversary Model), XXV-TC, DVC 500, Mark I, Fit for Heatilator Pellet BA100, BH105, BH60, BIO-120, Replace part number: 3-20-00844 3. 3-20-00844 pellet stove probe measures accurate temperature, responses sensitively, providing accurate measurement of tempe.