The invention is a dual functioning system for de-scaling or blowing down an electrically powered steam boiler. The steam boilers are generally used for sterilizing equipment and other items commonly used by health care professionals. The system includes a microprocessor controlled module, which is interfaced with the sterilizer controlled module, to measure the frequency and duration of the cleaning or blow down cycles. Typically, a cleaning cycle involves the use of an acid, such as phosphoric acid, to facilitate chemical removal of scale which is mineral deposits resulting from the use of hard water in the boiler. In the blow down cycle, the scale is removed by simple mechanical means without the use of a phosphoric acid cleaning solution. Various pumps and valves are utilized so that cleaning or blow down may be accomplished without having to disassemble or modify any input or drain lines.