Used in the following models: 400, 701, 501, 801, 601, WB 51, WB 81, WB 106, WB 151, WB 211, SB 1000, SB 1300, SB 1500, AW 1000, AW 1300, AW 1500, AW 151, AW 200, AW 286, AW 400, AW 501, AW 601, AW 701, AW 801, XP 1015, XP 1320, XP 1520, XP 400, XP 501, XP 601, XP 701, XP 801, KB 400, KB 501, KB 601, KB 701, KB 801, KB 399, KB 500, KB 600, KB 700, KB 800, AW 150, AW 199, AW 285, AW 399, AW 500, AW 600, AW 700, AW 800, KB 80, Floor Standing KB, KB 105, KB 150, KB 210, KB 285, WB 50, Wall Mount WB & WH, WB 80, WB 105, WB 150, WB 210, KB 81, KB 211, KB 106, KB 286, KB 151, Lochinvar Parts, Hydronic Heater Parts, Lochinvar, Lochinvar, Lochinvar, Knight