Used in the following models: 400, 501, WH 55, WB 51, WH 85, WB 81, WH 110, WB 106, WH 155, WB 151, WH 199, WB 211, WH 285, WH 399, AW 151, AW 200, AW 286, AW 400, AW 501, XP 400, XP 501, SNA 285, SNA 400, SNA 500, SNR 150, SNR 200, KB 400, KB 501, KB 399, KB 500, AW 150, AW 199, AW 285, AW 399, AW 500, WB 50, WB 80, WB 105, WB 150, WB 210, KB 80, Floor Standing KB, KB 105, KB 150, KB 210, KB 285, KB 81, KB 211, KB 106, KB 286, KB 151, Lochinvar Parts, Pool Heater Parts, XLP, Hydronic Heater Parts, Lochinvar, Lochinvar, Lochinvar, Knight, Wall Mount WB & WH