This study intends to grasp the consumption of cold and hot water and gas, which are wasted in a short time when cooking and washing-up using a single-lever kitchen faucet, and ultimately aims to examine the effectiveness of single-lever faucets which are initially developed to reduce such wasteful consumption. The first report concentrates on experimentation on washing-up activities using volunteers and the results of the basic experimentation are reported providing a fair idea of how often activities are performed as well as enabling the understanding of short-time usage of cold and hot water and gas, which possibly leads to wasteful consumption.
