Used in the following models: WH 55, WB 51, WH 85, WB 81, WH 110, WB 106, WH 155, WB 151, WH 199, WB 211, WH 285, WH 399, SB 1000, SB 1300, SB 1500, FB 1500, FB 2000, FB 2500, FB 3000, FB 3500, 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, 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