The 520814 module board is compatible with Suburban Water Heaters SW4D, SW6D, SW6DE, SW6DEL, SW6DEM, SW6DM, SW10D, SW10DE, SW10DEL, SW10DEM, SW10DM, SW12D, SW12DE, SW12DEL, SW12DEM, SW16D, SW16DE, SW16DEL, SW16DEM models. And for all Suburban Furnace And Water Heater circuit boards including 520871, 520814, 520820, 33550L, AP4896608. This Water Heater Modul Board fits the SW series water heaters above serial number 953900766.