The boiler-mounted Mr. Steam CU1-Digital1 room temperature control allows facility operators to set and maintain a 100-120-degree steam room temperature range. The CU1-Digital 1 includes a Digital 1 Operating Control with a sensor guard, a ¾” Steam Solenoid Valve, a ¾” Steam Head and operates with the Mr. Steam CU360-CU1400 steam room boilers. The Mr. Steam CU1-Digital1 is for new boilers only, to upgrade your F1 control, see the CU-104066 Field Kit.