Harman (pellet): Accentra Cast FS (Serial # 00840167 and higher), Accentra Insert (Serial # 008241201 and higher), Accentra 52i, Advance (Serial # 008360001 and higher), HF60, P35i Pellet Insert, P43, P61 (Serial # 008085055 and higher), P61A (Serial # 008085803 and higher), 

P68 (Serial # 008280309 and higher), PB105, PC45 (Serial # 008055031 and higher), PF100 (Red Wires), and XXV (Serial # 008206292 and higher)

Harman (coal): DVC 500 (Serial # 008065076 and higher)

Heatilator Eco-Choice: BH60, BH105, BA100 (Red Wires)

 This is the OEM Harman Part # 3-20-00844