Abstract
The purpose of this study is to clarify the effects of housing appliances such as energy-efficient water heaters and co-generation system and diversifying family composition and bathing habits on Energy Consumption especially hot water usage which is dominant in Japanese households. We conducted a web questionnaire survey to the dwellers of detached houses in temperate and cold climate. First, we analyzed the household characteristics and kinds of heating appliances they use based on the type of water heaters they use then compared the amount of energy they consume. Secondly, by focusing on the age of householders as an indicator of households'life stage, we found that the older the householders get, the more annual income they get, the older house they live and the more energy they consume. Finally, we quantified the effects of the life stage and bathing habits on the hot water energy consumption by conducting a multiple regression analysis and found that men in their 40s and women in their 20s, 60s and older consume much hot water energy.
