【正文】 wever, as EconoPilot employs a method of variable water pressure control corresponding to flow volume, the system can raise the energysaving ratio up to 90 percent. This paper describes the principles of the system and its basic functions, along with a case study of some practical applications. INTRODUCTION With the background of fulfilling public mitments for the prevention of global warning, many countries have consolidated related laws and regulations aiming to reduce energy consumption. Energy conservation has bee one of the important issues for panies and organizations accredited with the ISO 14000 series standards certification because they are required to achieve yearly targets for improvements, which have, in a sense, the same implications as laws. In a prolonged recession, investments in energysaving activities directly linked with cost reduction have attracted increasing attention. However, largescale renewal investments which entail enormous costs cannot be implemented easily