The main purpose of the study is to investigate if Boverkets supplement BEN is reasonable for apartment buildings with individual metering and charging for hot water. But also if there is any connection between hot water consumption, number of residents, bathtub and number of rooms in the apartments. Finally, it is investigated whether the residents make any active choice to reduce their consumption of hot water and if so why.In total, measurement data has been obtained from 2097 apartments distributed among 21 tenant-owned associations in Stockholm and Uppsala where Riksbyggen is the estate manager. The study also includes a comprehensive survey that was sent out to 975 apartments distributed among nine tenant-owned associations. The purpose of the survey is to get a better picture of how households reason about their hot water consumption. Through the database provided by Infometric, the work has had access to the apartments' actual hot water consumption. Thus, it has been possible to retrieve measurement data from all associations and to pair individual survey responses with the apartments' unique meter ID.The results presented in the study show that the associations are 27.1% below Boverkets supplement BEN for ordinary fixtures. At BEN for low-flush fixtures, the associations are 19.6% below the supplement. The study shows that factors such as the number of residents and the number of rooms and kitchens have a major impact on hot water consumption. Indications also show that bathtubs affect consumption to the negative to the extent that hot water consumption tends to increase. It also appears that residents are actively trying to minimize their hot water consumption where environmental reasons are stated as the main cause.