Used in the following models: WH 55, WB 51, WH 85, WB 81, WH 110, WB 106, WH 155, WB 151, WB 211, WB 50, WB 80, WB 105, WB 150, WB 210, KB 81, KB 211, KB 106, KB 151, Lochinvar Parts, Hydronic Heater Parts, Lochinvar, Lochinvar, Lochinvar, Knight, Floor Standing KB, Wall Mount WB & WH