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, SNA 285, SNA 400, SNA 500, SNR 150, SNR 200, 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, WB 50, 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, Floor Standing KB, Wall Mount WB & WH