Abstract
This paper reports on investigation of the current state on Direct Booster Water Supply(DBWS) System. The DBWS system is a method to connect a booster pump to the water service pipe diverged from water distibution pipe. This system was introduced for middle scale building in Japan about 10 years ago. However, there are a lot of problems after introduction. Then, the current state and the problems were understood, and the questionnaire survey of the breakdown of the device of increasing pressure etc. was done for the pump manufacturers.
