Used in the following models: 400, 701, 501, 801, 601, AW 151, AW 200, AW 286, AW 400, AW 501, AW 601, AW 701, AW 801, XP 400, XP 501, XP 601, XP 701, XP 801, KB 400, KB 501, KB 601, KB 701, KB 801, KB 80, KB 105, KB 150, KB 210, KB 285, 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 81, KB 211, KB 106, KB 286, KB 151, Lochinvar Parts, Hydronic Heater Parts, Lochinvar, Lochinvar, Lochinvar, Knight, Floor Standing KB